start-ver=1.4
cd-journal=joma
no-vol=12
cd-vols=
no-issue=3
article-no=
start-page=30
end-page=
dt-received=
dt-revised=
dt-accepted=
dt-pub-year=2022
dt-pub=20220207
dt-online=
en-article=
kn-article=
en-subject=
kn-subject=
en-title=
kn-title=Mitigation of groundwater iron-induced clogging by low-cost bioadsorbent in open loop geothermal heat pump systems
en-subtitle=
kn-subtitle=
en-abstract=
kn-abstract=Green energy production from natural resources can reduce emissions of greenhouse gases and pollutants from burning of fossil fuels in power plants. Recently, groundwater geothermal energy (GGE) is harnessed by deploying closed- and open-loop heat systems. In open-loop geothermal heat pump systems (OLGHPS), groundwater is reinjected into aquifer after harnessing GGE. Nevertheless, OLGHPS face noxious clogging issue because of elusive chemistry (corrosion or precipitation) of chemical species, principally of iron (Fe), in pipes and aquifers during reinjection process via oxidation reactions. Plethora of filtering materials are available for removal of ions, but these are quite expensive and environmentally unsafe. More recently, low-cost, eco-friendly, green filtering materials gain much interest. These materials can remove ions from groundwater that can minimize clogging in heat exchange systems, injection wells, and aquifer. In the present study, three filtering materials, i.e., wooden charcoal (biomaterial), yamazuna fine sand, and volcanic ash, were tested to estimate their Fe removal capacity. In upward flow mode with minimum oxygen-water contact, serial column (each with 6 ports) experiments were conducted under constant pressure head and constant velocity conditions. Columns were connected to well water having dissolved Fe concentration of 10.85 mg L-1. Sampling was done at the well, column inlets, column's six sampling ports and column outlets, and samples were analyzed for Fe by atomic absorption spectroscopy. Related tested parameters include pH, EC, temperature, turbidity, porosity, particle diameter, and dissolved oxygen. Volcanic ash showed less Fe removal, while sand filter showed substantial reduction in velocity. Biomaterial (wooden charcoal) displayed higher Fe adsorption capacity compared to other materials that can be ascribed to its surface chemistry and functional groups. Under different flow rates, maximum Fe content of 3.5 g Fe kg(-1) dry charcoal was obtained. By considering a safety factor and influence of groundwater composition, it is possible to design a biomaterial-based iron filter system to minimize Fe-induced chemical clogging in OLGHPS which is an eco-friendly, green energy source.
en-copyright=
kn-copyright=

en-aut-name=FujitaClaudia
en-aut-sei=Fujita
en-aut-mei=Claudia
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=1
ORCID=

en-aut-name=AkhtarM. Shahbaz
en-aut-sei=Akhtar
en-aut-mei=M. Shahbaz
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=2
ORCID=

en-aut-name=HidakaRay
en-aut-sei=Hidaka
en-aut-mei=Ray
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=3
ORCID=

en-aut-name=NishigakiMakoto
en-aut-sei=Nishigaki
en-aut-mei=Makoto
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=4
ORCID=

affil-num=1
en-affil=Geo?Environmental Evaluation Laboratory, Department of Environmental Design and Civil Engineering, Graduate School of Environmental and Life Science, Okayama University
kn-affil=

affil-num=2
en-affil=Geo?Environmental Evaluation Laboratory, Department of Environmental Design and Civil Engineering, Graduate School of Environmental and Life Science, Okayama University
kn-affil=

affil-num=3
en-affil=Geo?Environmental Evaluation Laboratory, Department of Environmental Design and Civil Engineering, Graduate School of Environmental and Life Science, Okayama University
kn-affil=

affil-num=4
en-affil=Geo?Environmental Evaluation Laboratory, Department of Environmental Design and Civil Engineering, Graduate School of Environmental and Life Science, Okayama University
kn-affil=
en-keyword=Dissolved iron removal
kn-keyword=Dissolved iron removal
en-keyword=Chemical clogging
kn-keyword=Chemical clogging
en-keyword=Open-loop geothermal systems
kn-keyword=Open-loop geothermal systems
en-keyword=Retention potential
kn-keyword=Retention potential
en-keyword=Wooden charcoal
kn-keyword=Wooden charcoal
END

start-ver=1.4
cd-journal=joma
no-vol=18
cd-vols=
no-issue=1
article-no=
start-page=5
end-page=10
dt-received=
dt-revised=
dt-accepted=
dt-pub-year=2011
dt-pub=20111226
dt-online=
en-article=
kn-article=
en-subject=
kn-subject=
en-title=Newly proposed landform division in the Kibi Plateau area: Application for a hazard map of landslides
kn-title=岡山市北部吉備高原地域における地形区分―斜面防災のための試み―
en-subtitle=
kn-subtitle=
en-abstract=
kn-abstract=The Kibi Plateau is characterized by horizontal skylines and they are considered to be an uplifted peneplain. Landform of the plateaus in central part of Okayama Prefecture is divided into "Kibi plateau landform" and "Recent dissecting landform". The Kibi plateau landform is composed of low relief surface and relict mountain. The altitude of the low relief surface varies from 300 to 450m in Kayo area, and 200 to 350m in Kanayama area. The Recent dissecting landform is characterized by escarpment and cuts the Kibi plateau landform. Knick-point is formed at the boundary between two landforms and steep slope is distributed just below the knick-point. The steep slope of the recent dissecting landform is unstable and a potential of landslide is high.
en-copyright=
kn-copyright=

en-aut-name=SuzukiShigeyuki
en-aut-sei=Suzuki
en-aut-mei=Shigeyuki
kn-aut-name=鈴木茂之
kn-aut-sei=鈴木
kn-aut-mei=茂之
aut-affil-num=1
ORCID=

en-aut-name=OmizoYuna
en-aut-sei=Omizo
en-aut-mei=Yuna
kn-aut-name=大溝佑奈
kn-aut-sei=大溝
kn-aut-mei=佑奈
aut-affil-num=2
ORCID=

en-aut-name=HirataMinoru
en-aut-sei=Hirata
en-aut-mei=Minoru
kn-aut-name=平田稔
kn-aut-sei=平田
kn-aut-mei=稔
aut-affil-num=3
ORCID=

en-aut-name=NishigakiMakoto
en-aut-sei=Nishigaki
en-aut-mei=Makoto
kn-aut-name=西垣誠
kn-aut-sei=西垣
kn-aut-mei=誠
aut-affil-num=4
ORCID=

affil-num=1
en-affil=
kn-affil=岡山大学大学院自然科学研究科

affil-num=2
en-affil=
kn-affil=岡山大学大学院自然科学研究科

affil-num=3
en-affil=
kn-affil=

affil-num=4
en-affil=
kn-affil=岡山大学大学院環境学研究科
en-keyword=Kibi Plateau
kn-keyword=Kibi Plateau
en-keyword=landslide
kn-keyword=landslide
en-keyword=knick-point
kn-keyword=knick-point
en-keyword=Okayama Prefecture
kn-keyword=Okayama Prefecture
END

start-ver=1.4
cd-journal=joma
no-vol=25
cd-vols=
no-issue=
article-no=
start-page=19
end-page=24
dt-received=
dt-revised=
dt-accepted=
dt-pub-year=2003
dt-pub=200308
dt-online=
en-article=
kn-article=
en-subject=
kn-subject=
en-title=The basic study on measuring method of contamination of the ground and the effective porosity by using dielectric constant measuring system
kn-title=誘電率計測法による地盤の汚染度及び有効間隙率の測定方法に関する基礎的研究
en-subtitle=
kn-subtitle=
en-abstract=
kn-abstract=For evaluating subsurface contamination, sampling method (boring) is commonly used, but this method cannot monitor the change of in-situ contamination and concentration with respect to time. The purpose of this study is to develop a measuring system for subsurface contamination in which a so-called FDR (Frequency Domain Refiectometry) and FDR-V (with Vector network analyzer) system was employed to measure the salinity and oil contaminant. This FDR and FDR-V method is a coaxial probe method, which allows the measurement of the dielectric. The experimental study indicates the possibility in measuring both the contaminant concentration and volumetric moisture content. In addition, the method for obtaining the effective porosity using this equipment was shown. Concretely, the sensor was inserted in the ground, and the liquid in which the dielectric constant differed on the water in the circumference was injected, and the method for obtaining the effective porosity from the change of the dielectric constant was proposed.
en-copyright=
kn-copyright=

en-aut-name=NishigakiMakoto
en-aut-sei=Nishigaki
en-aut-mei=Makoto
kn-aut-name=西垣誠
kn-aut-sei=西垣
kn-aut-mei=誠
aut-affil-num=1
ORCID=

en-aut-name=KomatsuMitsuru
en-aut-sei=Komatsu
en-aut-mei=Mitsuru
kn-aut-name=小松満
kn-aut-sei=小松
kn-aut-mei=満
aut-affil-num=2
ORCID=

en-aut-name=KimMan-il
en-aut-sei=Kim
en-aut-mei=Man-il
kn-aut-name=金萬鎰
kn-aut-sei=金
kn-aut-mei=萬鎰
aut-affil-num=3
ORCID=

affil-num=1
en-affil=
kn-affil=岡山大学環境理工学部

affil-num=2
en-affil=
kn-affil=岡山大学大学院自然科学研究科

affil-num=3
en-affil=
kn-affil=岡山大学大学院自然科学研究科
en-keyword=Dielectric constant
kn-keyword=Dielectric constant
en-keyword=Contamination
kn-keyword=Contamination
en-keyword=Frequency Domain Refiectometry
kn-keyword=Frequency Domain Refiectometry
en-keyword=In-situ
kn-keyword=In-situ
en-keyword=Effective porosity
kn-keyword=Effective porosity
END

start-ver=1.4
cd-journal=joma
no-vol=21
cd-vols=
no-issue=1
article-no=
start-page=71
end-page=79
dt-received=
dt-revised=
dt-accepted=
dt-pub-year=1986
dt-pub=19861115
dt-online=
en-article=
kn-article=
en-subject=
kn-subject=
en-title=
kn-title=Determination of Coefficients of Groundwater Flow in Multilayered Aquifers
en-subtitle=
kn-subtitle=
en-abstract=
kn-abstract=It is difficult to determine the coefficients of groundwater flow from the data which were obtained from the
drawdown test in a multiaquifer system. In this paper, new methods of analyzing drawdown-tests are developed and illustrated with the example to determine aquifer coefficients. In a double-layered aquifer, the analytical solution of drawdown test, in which water is discharged from both layers, is derived. And also the theoretical solution to determine the coefficient of storage by using an index of elasticity of a confined aquifer is derived.
From these solutions, methods of determining the coefficient of transmissibility in a double-layered aquifer
and the coefficinent of storage in a confined aquifer are
got. The example analysis to determine aquifer coefficients
is shown. As a result, the characteristics which were
obtained by these methods are verified by the real drawdown
test data.
en-copyright=
kn-copyright=

en-aut-name=
en-aut-sei=
en-aut-mei=
kn-aut-name=TakeshitaYuji
kn-aut-sei=Takeshita
kn-aut-mei=Yuji
aut-affil-num=1
ORCID=

en-aut-name=
en-aut-sei=
en-aut-mei=
kn-aut-name=NishigakiMakoto
kn-aut-sei=Nishigaki
kn-aut-mei=Makoto
aut-affil-num=2
ORCID=

en-aut-name=
en-aut-sei=
en-aut-mei=
kn-aut-name=KohnoIichiro
kn-aut-sei=Kohno
kn-aut-mei=Iichiro
aut-affil-num=3
ORCID=

affil-num=1
en-affil=
kn-affil=Department of Civil Engineering

affil-num=2
en-affil=
kn-affil=Department of Civil Engineering

affil-num=3
en-affil=
kn-affil=Department of Civil Engineering
END

start-ver=1.4
cd-journal=joma
no-vol=16
cd-vols=
no-issue=2
article-no=
start-page=89
end-page=99
dt-received=
dt-revised=
dt-accepted=
dt-pub-year=1982
dt-pub=19820329
dt-online=
en-article=
kn-article=
en-subject=
kn-subject=
en-title=
kn-title=Finite Element Analysis of Salt Water Intrusion in Nonsteady Seepage
en-subtitle=
kn-subtitle=
en-abstract=
kn-abstract=In this paper are described on the finite element analysis of the nonsteady behavior of interface between salt- and freshwater in coastal groundwater. In order to investigate the validity and the accuracy of this numerical analysis solution, the results calculated by this finite element analysis have been compared with the laboratory model tests. The numerical results showed the very good agreement with the experimental data. Moreover, some applications of this analytical method have been performed.
en-copyright=
kn-copyright=

en-aut-name=
en-aut-sei=
en-aut-mei=
kn-aut-name=KohnoIichiro
kn-aut-sei=Kohno
kn-aut-mei=Iichiro
aut-affil-num=1
ORCID=

en-aut-name=
en-aut-sei=
en-aut-mei=
kn-aut-name=NishigakiMakoto
kn-aut-sei=Nishigaki
kn-aut-mei=Makoto
aut-affil-num=2
ORCID=

affil-num=1
en-affil=
kn-affil=Department of Civil Engineering

affil-num=2
en-affil=
kn-affil=Department of Civil Engineering
END

start-ver=1.4
cd-journal=joma
no-vol=16
cd-vols=
no-issue=1
article-no=
start-page=65
end-page=89
dt-received=
dt-revised=
dt-accepted=
dt-pub-year=1982
dt-pub=19820301
dt-online=
en-article=
kn-article=
en-subject=
kn-subject=
en-title=
kn-title=Determination of Diffusion and Dispersion Parameters for Flow in Porous Media
en-subtitle=
kn-subtitle=
en-abstract=
kn-abstract=The purposes of this research is an investigation of the intrusion of sea water into coastal aquifers. For this subject, this paper deals with proposing rational methods of getting diffusion coefficient and dispersion parameter for flow in porous media in a laboratory. These parameters of soil are indispensable in order to apply an analytical approach or a numerical approach to actual salt water intrusion problems. Experimental apparatuses were constructed and test procedures were also developed to measure concentration behaviors in a saturated porous media by using electro conductivity probe. As the results, the diffusion coefficients for the Toyoura standard sand and the Asahi river sand determined by two methods, that is,
"Boltzman's transformation method" and "Instantaneous profile analysis method". The longitudinal coefficient of dispersion for one-dimensional flow was also determined by the least squares curve fitting method with a function of a certain range of seepage velocity.
en-copyright=
kn-copyright=

en-aut-name=
en-aut-sei=
en-aut-mei=
kn-aut-name=KohnoIichiro
kn-aut-sei=Kohno
kn-aut-mei=Iichiro
aut-affil-num=1
ORCID=

en-aut-name=
en-aut-sei=
en-aut-mei=
kn-aut-name=NishigakiMakoto
kn-aut-sei=Nishigaki
kn-aut-mei=Makoto
aut-affil-num=2
ORCID=

affil-num=1
en-affil=
kn-affil=Department of Civil Engineering

affil-num=2
en-affil=
kn-affil=Department of Civil Engineering
END

start-ver=1.4
cd-journal=joma
no-vol=14
cd-vols=
no-issue=2
article-no=
start-page=73
end-page=110
dt-received=
dt-revised=
dt-accepted=
dt-pub-year=1980
dt-pub=19800301
dt-online=
en-article=
kn-article=
en-subject=
kn-subject=
en-title=
kn-title=Experimental Study on Determining Unsaturated Property of Soil
en-subtitle=
kn-subtitle=
en-abstract=
kn-abstract=This paper deals with the experimental study of hydraulic properties of unsaturated soil. In treating unsaturated zone, a great deal more data are required than are required for the saturated zone, but these properties of soils must be known to apply the finite element approach to actual groundwater flow problems. The purposes of this paper are to propose a rational basis of getting experimental relationships between prossure head() and hydraulic conductivity(K) and between pressure head() and volumetric moisture content(θ) with "the instantaneous profile method" in a laboratory. An apparatus was constructed and test procedures were developed to measure pressure head and volumetric moisture content by using pressure transducers and low-energy gamma ray attenuation.
The technique of a low-energy gamma radiation apparatus does provide a means for accurate measurement of water content without disturbing the system into which water is moving. Furthermore rapid measurement of water content becomes possible at any position in a soil so that water content changes with time may easily be followed. The tensiometer~transducer system provides a most valuable means of measuring pressure head with rapid response and with provision of a complete record of the pressure head
changes with time.
en-copyright=
kn-copyright=

en-aut-name=
en-aut-sei=
en-aut-mei=
kn-aut-name=KonoIichiro
kn-aut-sei=Kono
kn-aut-mei=Iichiro
aut-affil-num=1
ORCID=

en-aut-name=
en-aut-sei=
en-aut-mei=
kn-aut-name=NishigakiMakoto
kn-aut-sei=Nishigaki
kn-aut-mei=Makoto
aut-affil-num=2
ORCID=

affil-num=1
en-affil=
kn-affil=Department of Civil Engineering.

affil-num=2
en-affil=
kn-affil=Department of Civil Engineering.
END

start-ver=1.4
cd-journal=joma
no-vol=14
cd-vols=
no-issue=2
article-no=
start-page=53
end-page=72
dt-received=
dt-revised=
dt-accepted=
dt-pub-year=1980
dt-pub=19800301
dt-online=
en-article=
kn-article=
en-subject=
kn-subject=
en-title=
kn-title=A Consideration on Physics of Saturated-UnsaturatedGroundwater Motion
en-subtitle=
kn-subtitle=
en-abstract=
kn-abstract=The purposes of this paper are primarily to research on behavior of groundwater flow in saturated and unsaturated zone, and to present the fundamentals of the theory of groundwater flow. This paper discusses the physics of the saturated-unsaturated groundwater motion. Evaluations confirm the early belief that Darcy's law is of the nature of statistical result giving the empirical equivalent of
Navier-Stokes equations. The governing equation of
saturated-unsaturated flow in porous media is derived from the law of mass conservation and from the Darcy's law and Richard's equation of motion and is compared with the Klute's diffusion equation which has been widely used in the analysis of unsaturated flow. As a result; it is concluded that the governing equation has the advantage that can be applied for the whole flow region. Typical boundary conditions are enumerated.
en-copyright=
kn-copyright=

en-aut-name=
en-aut-sei=
en-aut-mei=
kn-aut-name=NishigakiMakoto
kn-aut-sei=Nishigaki
kn-aut-mei=Makoto
aut-affil-num=1
ORCID=

en-aut-name=
en-aut-sei=
en-aut-mei=
kn-aut-name=KonoIichiro
kn-aut-sei=Kono
kn-aut-mei=Iichiro
aut-affil-num=2
ORCID=

affil-num=1
en-affil=
kn-affil=Department of Civil Engineering

affil-num=2
en-affil=
kn-affil=Department of Civil Engineering
END

start-ver=1.4
cd-journal=joma
no-vol=14
cd-vols=
no-issue=1
article-no=
start-page=95
end-page=126
dt-received=
dt-revised=
dt-accepted=
dt-pub-year=1979
dt-pub=19791201
dt-online=
en-article=
kn-article=
en-subject=
kn-subject=
en-title=
kn-title=Transient Flow in Groundwater to Wells in Island Model Aquifer
en-subtitle=
kn-subtitle=
en-abstract=
kn-abstract=In order to apply the numerical method to practical groundwater flow problem in the field, the hydraulic properties must be estimated. In this paper, new methods of analyzing drawdown tests were developed and illustrated with some examples to determine hydraulic properties of aquifer. Drawdown tests sometimes have to be performed near the boundary of the aquifer or in the much groundwater supplied aquifer. In such instances, the assumption that the aquifer is of infinite areal extent is no longer valid. Therefore the analytical solutions of unsteady flow due to drawdown test are derived in the conception of "Island Model" that the shape of groundwater level is fixed by the circular water supply which is equilibrium with the pumping rate. By using these solutions, new methods of analyzing drawdown tests which are performed in a confined aquifer and an unconfined aquifer were given respectively and the effect of influence region was evaluated. The example analysis to determine permeability and storage coefficient were shown. As the results,the propriety of the solutions is verified comparing the analytical results with the drawdown test data taken from a real aquifer project.
en-copyright=
kn-copyright=

en-aut-name=
en-aut-sei=
en-aut-mei=
kn-aut-name=NishigakiMakoto
kn-aut-sei=Nishigaki
kn-aut-mei=Makoto
aut-affil-num=1
ORCID=

en-aut-name=
en-aut-sei=
en-aut-mei=
kn-aut-name=KonoIichiro
kn-aut-sei=Kono
kn-aut-mei=Iichiro
aut-affil-num=2
ORCID=

affil-num=1
en-affil=
kn-affil=Depertment of Civil Engineering

affil-num=2
en-affil=
kn-affil=Depertment of Civil Engineering
END

start-ver=1.4
cd-journal=joma
no-vol=14
cd-vols=
no-issue=1
article-no=
start-page=61
end-page=94
dt-received=
dt-revised=
dt-accepted=
dt-pub-year=1979
dt-pub=19791201
dt-online=
en-article=
kn-article=
en-subject=
kn-subject=
en-title=
kn-title=Application of Fininite Element Analysis to Groundwater Flow in Field Problems
en-subtitle=
kn-subtitle=
en-abstract=
kn-abstract=The purposes of this paper are primarily to research on behavior of groundwater flow in saturated and unsaturated zone and to develop the most effective methods for solving groundwater flow problems related to civil engineering practice. The mathematical model provides a finite element solution to two- or threedimensional problems involving transient flow in the saturated and unsaturated domains of nonhomogeneous, anisotropic porous media. Before progressing into the various levels of applications the input data and boundary conditions are discussed and evaluated. To demonstrate the flexibility of the finite element approach and its capability in treating complex
situations which are often encountered in the field, the groundwater flow through sand bank at flood water levels and the flow through aquifer due to an excavation were analyzed. As the results there were good qualitative agreements between the numerical results and the informations received.
en-copyright=
kn-copyright=

en-aut-name=
en-aut-sei=
en-aut-mei=
kn-aut-name=KonoIichiro
kn-aut-sei=Kono
kn-aut-mei=Iichiro
aut-affil-num=1
ORCID=

en-aut-name=
en-aut-sei=
en-aut-mei=
kn-aut-name=NishigakiMakoto
kn-aut-sei=Nishigaki
kn-aut-mei=Makoto
aut-affil-num=2
ORCID=

affil-num=1
en-affil=
kn-affil=Depertment of Civil Engineering

affil-num=2
en-affil=
kn-affil=Depertment of Civil Engineering
END

start-ver=1.4
cd-journal=joma
no-vol=12
cd-vols=
no-issue=
article-no=
start-page=97
end-page=128
dt-received=
dt-revised=
dt-accepted=
dt-pub-year=1978
dt-pub=19780225
dt-online=
en-article=
kn-article=
en-subject=
kn-subject=
en-title=
kn-title=Analysis of Pump Test Data for Partial Penetrating wells
en-subtitle=
kn-subtitle=
en-abstract=
kn-abstract=The solutions of unsteady phreatic flow toward a partially penetrating well in an aquifer of finite thickness are described. Firstly the solution for a confined aquifer is shown. In this case,three methods of analyzing field data with partially penetrating well are given, that is, "Log-Log Method, Log-Log Distance Drawdown Method and Jacob's Method Ajusted for Partial Penetration". By using these methods the hydraulic conductivities and the specific storage of the aquifer may be determined. Secondly the solution for an,unconfined aquifer is shown. In this case, also two methods of analyzing field data with partially penetrating well are given. By using these methods, the anisotropic permeability and the storage coefficient (effective porosity) of the aquifer may be determined.
Moreover in each case, the effects of partial penetration
are discussed and the limits of adapting the Theis' and Jacob's methods are setted. From these analytic results,
some cosiderations are added to determine the anisotropy of permeability and to evaluate the storage coefficient.
en-copyright=
kn-copyright=

en-aut-name=
en-aut-sei=
en-aut-mei=
kn-aut-name=KonoIichiro
kn-aut-sei=Kono
kn-aut-mei=Iichiro
aut-affil-num=1
ORCID=

en-aut-name=
en-aut-sei=
en-aut-mei=
kn-aut-name=NishigakiMakoto
kn-aut-sei=Nishigaki
kn-aut-mei=Makoto
aut-affil-num=2
ORCID=

affil-num=1
en-affil=
kn-affil=Depertment of Civil Engineering

affil-num=2
en-affil=
kn-affil=Depertment of Civil Engineering
END

start-ver=1.4
cd-journal=joma
no-vol=25
cd-vols=
no-issue=1
article-no=
start-page=99
end-page=109
dt-received=
dt-revised=
dt-accepted=
dt-pub-year=1990
dt-pub=19901214
dt-online=
en-article=
kn-article=
en-subject=
kn-subject=
en-title=
kn-title=Determining Hydraulic Properties of Multilayered Aquifers from Pumping Test Data by Parameter Estimation
en-subtitle=
kn-subtitle=
en-abstract=
kn-abstract=In this paper, a numerical procedure of determining hydraulic properties in multilayered aquifers are presented. From pumping test data in multilayered aquifers, the coefficient of permeability and specific storage for each aquifer are determined by using a combination of finite element analysis and nonlinear least-squares optimization technique. This study especially points out necessity of stress-flow coupling analysis to explain the behaviors of pressure head in multilayered aquifer during pumping test. As a example, practical pumping test data were evaluate and the coefficients of permeability and specific storage of aquifers and aquitard were obtained.
en-copyright=
kn-copyright=

en-aut-name=NishigakiMakoto
en-aut-sei=Nishigaki
en-aut-mei=Makoto
kn-aut-name=西垣誠
kn-aut-sei=西垣
kn-aut-mei=誠
aut-affil-num=1
ORCID=

en-aut-name=TakeshitaYuji
en-aut-sei=Takeshita
en-aut-mei=Yuji
kn-aut-name=竹下祐二
kn-aut-sei=竹下
kn-aut-mei=祐二
aut-affil-num=2
ORCID=

en-aut-name=KonoIichiro
en-aut-sei=Kono
en-aut-mei=Iichiro
kn-aut-name=河野伊一郎
kn-aut-sei=河野
kn-aut-mei=伊一郎
aut-affil-num=3
ORCID=

affil-num=1
en-affil=
kn-affil=Department of Civil Engineering

affil-num=2
en-affil=
kn-affil=Department of Civil Engineering

affil-num=3
en-affil=
kn-affil=Department of Civil Engineering
END

start-ver=1.4
cd-journal=joma
no-vol=25
cd-vols=
no-issue=1
article-no=
start-page=59
end-page=69
dt-received=
dt-revised=
dt-accepted=
dt-pub-year=1990
dt-pub=19901214
dt-online=
en-article=
kn-article=
en-subject=
kn-subject=
en-title=
kn-title=Pumping Test for Multilayered Aquifers
en-subtitle=
kn-subtitle=
en-abstract=
kn-abstract=In this paper, we propose a method to determine the coefficients of permeability of the unconfined aquifer consisted of two different permeability layers. With mixing the conventional pumping test and falling head permeability test, the coefficients of permeabilitiy k(1) and k(2) were obtained. The validity of the proposed method is investigated by using the numerical simulation. As the results, it becomes apparent that the proposed method is applicable to real hydarulic problems.
en-copyright=
kn-copyright=

en-aut-name=KohnoIichiro
en-aut-sei=Kohno
en-aut-mei=Iichiro
kn-aut-name=河野伊一郎
kn-aut-sei=河野
kn-aut-mei=伊一郎
aut-affil-num=1
ORCID=

en-aut-name=NishigakiMakoto
en-aut-sei=Nishigaki
en-aut-mei=Makoto
kn-aut-name=西垣誠
kn-aut-sei=西垣
kn-aut-mei=誠
aut-affil-num=2
ORCID=

en-aut-name=
en-aut-sei=
en-aut-mei=
kn-aut-name=OkadaJunji
kn-aut-sei=Okada
kn-aut-mei=Junji
aut-affil-num=3
ORCID=

affil-num=1
en-affil=
kn-affil=Department of Civil engineering

affil-num=2
en-affil=
kn-affil=Department of Civil engineering

affil-num=3
en-affil=
kn-affil=Nakaboli Soil Corner Co. Ltd.
END

start-ver=1.4
cd-journal=joma
no-vol=24
cd-vols=
no-issue=1
article-no=
start-page=107
end-page=114
dt-received=
dt-revised=
dt-accepted=
dt-pub-year=1989
dt-pub=19891129
dt-online=
en-article=
kn-article=
en-subject=
kn-subject=
en-title=
kn-title=Determination of Unsaturated Soil Hydraulic Properties by Transient Flow Experiments and Parameter Estimation
en-subtitle=
kn-subtitle=
en-abstract=
kn-abstract=The numerical feasibility of determining soil water retention and hydraulic conductivity functions simultaneously from one-dimensional transient flow experiments in the laboratory by parameter estimation method is evaluated. Soil hydraulic properties are assumed to be represented by van Genuchten's closed-form expressions involving two unknown parameters: coefficients α and n . These parameters are evaluated by nonlinear least-squares fitting of predicted and observed pressure head with time. Gravity drainage experiments are performed for Toyoura standard sand to evaluate the adequacy of this proposed method.
en-copyright=
kn-copyright=

en-aut-name=KohnoIichiro
en-aut-sei=Kohno
en-aut-mei=Iichiro
kn-aut-name=河野伊一郎
kn-aut-sei=河野
kn-aut-mei=伊一郎
aut-affil-num=1
ORCID=

en-aut-name=NishigakiMakoto
en-aut-sei=Nishigaki
en-aut-mei=Makoto
kn-aut-name=西垣誠
kn-aut-sei=西垣
kn-aut-mei=誠
aut-affil-num=2
ORCID=

en-aut-name=TakeshitaYuji
en-aut-sei=Takeshita
en-aut-mei=Yuji
kn-aut-name=竹下祐二
kn-aut-sei=竹下
kn-aut-mei=祐二
aut-affil-num=3
ORCID=

affil-num=1
en-affil=
kn-affil=Department of Civil Engineering

affil-num=2
en-affil=
kn-affil=Department of Civil Engineering

affil-num=3
en-affil=
kn-affil=Department of Civil Engineering
END

start-ver=1.4
cd-journal=joma
no-vol=28
cd-vols=
no-issue=2
article-no=
start-page=59
end-page=75
dt-received=
dt-revised=
dt-accepted=
dt-pub-year=1994
dt-pub=19940315
dt-online=
en-article=
kn-article=
en-subject=
kn-subject=
en-title=
kn-title=A Study on the Elasto-plastical Constitutive Equation for Unsaturated Soil
en-subtitle=
kn-subtitle=
en-abstract=
kn-abstract=In this paper, first, an elasto-plastic consitituve equation for unsaturated soil was developed by considering of the basically behavior of unsaturated soil. Second, the results of a number of triaxial test and a set of rigid
foundation model tests were simulated by using this constitutive equation, the agreement between observed and computed results was satisfactory and confirms the possibilities of this constitutive equation.
en-copyright=
kn-copyright=

en-aut-name=NishigakiMakoto
en-aut-sei=Nishigaki
en-aut-mei=Makoto
kn-aut-name=西垣誠
kn-aut-sei=西垣
kn-aut-mei=誠
aut-affil-num=1
ORCID=

en-aut-name=
en-aut-sei=
en-aut-mei=
kn-aut-name=SunYao
kn-aut-sei=Sun
kn-aut-mei=Yao
aut-affil-num=2
ORCID=

en-aut-name=KohnoIichiro
en-aut-sei=Kohno
en-aut-mei=Iichiro
kn-aut-name=河野伊一郎
kn-aut-sei=河野
kn-aut-mei=伊一郎
aut-affil-num=3
ORCID=

affil-num=1
en-affil=
kn-affil=Department of Civil Engineering

affil-num=2
en-affil=
kn-affil=The Graduate School of Natural Science and Technology

affil-num=3
en-affil=
kn-affil=Department of Civil Engineering
END

start-ver=1.4
cd-journal=joma
no-vol=22
cd-vols=
no-issue=
article-no=
start-page=45
end-page=62
dt-received=
dt-revised=
dt-accepted=
dt-pub-year=1988
dt-pub=19880331
dt-online=
en-article=
kn-article=
en-subject=
kn-subject=
en-title=
kn-title=An Experimental Study on Levee Failure Caused by Seepage and Preventive Measures
en-subtitle=
kn-subtitle=
en-abstract=
kn-abstract=There are two classifications of the mechanism of levee failure caused by floods; local seepage failure and progressive failure. The fundamental causes of levee failure produced by piping and erosion were studied and the safety of river leves during floods evaluated in terms of soil machanics. The critical hydraulic gradient and the process of progressive failure were obtained from one- and two- dimensional model experiments for piping and erosion. Problems inherent in and preventive measures against levee failure are discussed. In particular, effects of the Tsukinowa method, the most representative Japanese flood fighting method, were studied experimentally and improvements proposed.
en-copyright=
kn-copyright=

en-aut-name=KohnoIichiro
en-aut-sei=Kohno
en-aut-mei=Iichiro
kn-aut-name=河野伊一郎
kn-aut-sei=河野
kn-aut-mei=伊一郎
aut-affil-num=1
ORCID=

en-aut-name=NishigakiMakoto
en-aut-sei=Nishigaki
en-aut-mei=Makoto
kn-aut-name=西垣誠
kn-aut-sei=西垣
kn-aut-mei=誠
aut-affil-num=2
ORCID=

en-aut-name=TakeshitaYuji
en-aut-sei=Takeshita
en-aut-mei=Yuji
kn-aut-name=竹下祐二
kn-aut-sei=竹下
kn-aut-mei=祐二
aut-affil-num=3
ORCID=

affil-num=1
en-affil=
kn-affil=Department of Civil Engineering

affil-num=2
en-affil=
kn-affil=Department of Civil Engineering

affil-num=3
en-affil=
kn-affil=Department of Civil Engineering
END

start-ver=1.4
cd-journal=joma
no-vol=28
cd-vols=
no-issue=1
article-no=
start-page=87
end-page=128
dt-received=
dt-revised=
dt-accepted=
dt-pub-year=1993
dt-pub=19931130
dt-online=
en-article=
kn-article=
en-subject=
kn-subject=
en-title=
kn-title=Drain System Around the Underground Cavern
en-subtitle=
kn-subtitle=
en-abstract=
kn-abstract=In recent years, construction or planning of large-scale underground structures, such as underground power plants, underground oil storage plants and nuclear power plants have been coming into consideration in Japan. To construct such as large-scale underground structures, one of the most important problems is to make clear beforehand the behavior of groundwater around these structures and the other is to carry out proper countermeasure of groundwater, so that these structures can be constructed safely and maintained stability over a long time period.
This report describes the results of theoretical studies on the drain systems and at the same time, discusses the drain systems around the underground cavern for the practical underground power stations.
en-copyright=
kn-copyright=

en-aut-name=
en-aut-sei=
en-aut-mei=
kn-aut-name=MotojimaIsao
kn-aut-sei=Motojima
kn-aut-mei=Isao
aut-affil-num=1
ORCID=

en-aut-name=KonoIichiro
en-aut-sei=Kono
en-aut-mei=Iichiro
kn-aut-name=河野伊一郎
kn-aut-sei=河野
kn-aut-mei=伊一郎
aut-affil-num=2
ORCID=

en-aut-name=NishigakiMakoto
en-aut-sei=Nishigaki
en-aut-mei=Makoto
kn-aut-name=西垣誠
kn-aut-sei=西垣
kn-aut-mei=誠
aut-affil-num=3
ORCID=

affil-num=1
en-affil=
kn-affil=Central Research Institute of Electric Power Industry

affil-num=2
en-affil=
kn-affil=Department of Civil Engineerig

affil-num=3
en-affil=
kn-affil=Department of Civil Engineerig
END

start-ver=1.4
cd-journal=joma
no-vol=28
cd-vols=
no-issue=1
article-no=
start-page=71
end-page=85
dt-received=
dt-revised=
dt-accepted=
dt-pub-year=1993
dt-pub=19931130
dt-online=
en-article=
kn-article=
en-subject=
kn-subject=
en-title=
kn-title=Numerical Analysis of Salt Intrusion into Aquifer by Eulerian Lagrangian Finite Element Method
en-subtitle=
kn-subtitle=
en-abstract=
kn-abstract=In this paper, method of Eulerian Lagrangian numerical analysis is used to described Advection-Dispersion phenomena. The influence of concentration to the density of fluid is considered. A laboratory model of a two dimensional confined aquifer containing an isotropic, homogeneous porous medium (Hosokawa et.al 1989) was used to validate the applicability of Advection-Dispersion of numerical analysis with steady and unsteady state condition [1].
en-copyright=
kn-copyright=

en-aut-name=NishigakiMakoto
en-aut-sei=Nishigaki
en-aut-mei=Makoto
kn-aut-name=西垣誠
kn-aut-sei=西垣
kn-aut-mei=誠
aut-affil-num=1
ORCID=

en-aut-name=
en-aut-sei=
en-aut-mei=
kn-aut-name=SudindaTeddy
kn-aut-sei=Sudinda
kn-aut-mei=Teddy
aut-affil-num=2
ORCID=

en-aut-name=
en-aut-sei=
en-aut-mei=
kn-aut-name=HishiyaTomoyuki
kn-aut-sei=Hishiya
kn-aut-mei=Tomoyuki
aut-affil-num=3
ORCID=

en-aut-name=KohnoIichiro
en-aut-sei=Kohno
en-aut-mei=Iichiro
kn-aut-name=河野伊一郎
kn-aut-sei=河野
kn-aut-mei=伊一郎
aut-affil-num=4
ORCID=

affil-num=1
en-affil=
kn-affil=Department of Civil Engineering

affil-num=2
en-affil=
kn-affil=Graduate Student in Department of Civil Engineering

affil-num=3
en-affil=
kn-affil=D I A Consultant

affil-num=4
en-affil=
kn-affil=Department of Civil Engineering
END

start-ver=1.4
cd-journal=joma
no-vol=27
cd-vols=
no-issue=1
article-no=
start-page=93
end-page=105
dt-received=
dt-revised=
dt-accepted=
dt-pub-year=1992
dt-pub=19921125
dt-online=
en-article=
kn-article=
en-subject=
kn-subject=
en-title=
kn-title=Advection Dispersion by Eulerian Lagrangian Finite Element Method
en-subtitle=
kn-subtitle=
en-abstract=
kn-abstract=In this paper the author will be describe phenomena of advection dispersion in subsurface flow by using Eulerian Lagrangian Finite Element Method. Where Finite Element Method with Galerkin formulation and weigthed residual method is used to solve seepage and advection dispersion equation. The problem of one dimensional and two dimensional rectangular wave are analyzed in this paper. And the result of numerical analyses will be compared with analytical solutions. The numerical results showed the very good agreement with the analytical solutions.
en-copyright=
kn-copyright=

en-aut-name=NishigakiMakoto
en-aut-sei=Nishigaki
en-aut-mei=Makoto
kn-aut-name=西垣誠
kn-aut-sei=西垣
kn-aut-mei=誠
aut-affil-num=1
ORCID=

en-aut-name=
en-aut-sei=
en-aut-mei=
kn-aut-name=SudindaTeddy
kn-aut-sei=Sudinda
kn-aut-mei=Teddy
aut-affil-num=2
ORCID=

en-aut-name=
en-aut-sei=
en-aut-mei=
kn-aut-name=HishiyaTomoyuki
kn-aut-sei=Hishiya
kn-aut-mei=Tomoyuki
aut-affil-num=3
ORCID=

en-aut-name=KohnoIchiro
en-aut-sei=Kohno
en-aut-mei=Ichiro
kn-aut-name=河野伊一郎
kn-aut-sei=河野
kn-aut-mei=伊一郎
aut-affil-num=4
ORCID=

affil-num=1
en-affil=
kn-affil=Department of Civil Engineering

affil-num=2
en-affil=
kn-affil=Graduate Student in Department of Civil Engineering

affil-num=3
en-affil=
kn-affil=D I A Consultant

affil-num=4
en-affil=
kn-affil=Department of Civil Engineering
END

start-ver=1.4
cd-journal=joma
no-vol=14
cd-vols=
no-issue=1
article-no=
start-page=23
end-page=28
dt-received=
dt-revised=
dt-accepted=
dt-pub-year=2009
dt-pub=20090316
dt-online=
en-article=
kn-article=
en-subject=
kn-subject=
en-title=
kn-title=Laboratory Investigation of Ethanol/Bentonite Slurry Grouting into Rock Fractures: Preliminary Resalts
en-subtitle=
kn-subtitle=
en-abstract=
kn-abstract=During underground space development, groundwater seepage mostly occurs which may seriously affect the stability of deep excavations as well as retard progress of construction. For smooth progress of work, effective construction and operation of a disposal facility for high level radioactive waste (HLW), it is important to control seepage into excavations by sealing off fractures or fissures and excavation disturbed zones (EDZ) to control groundwater inflow during the construction phase of such a facility. In this study, a series of experiments were conducted on ethanol/bentonite slurries in the laboratory with the aim of determining the effect of a hydrophilic solvent such as ethanol on the hydraulic and injection characteristic of bentonite slurry for the sealing of fissures to control ground water seepage during the construction phase of a repository. Preliminary results revealed ethanol/bentonite slurry as an effective grouting material capable of penetrating micro fractures (100μm or less) and with the permeability of the grouted medium being as low as 10E-7cm/s. The results also show that the effectiveness and efficiency of grouting is dependent on the type of injection and fissure size. Dynamic injection was observed to be efficient as it was able to inject high dense slurry.
en-copyright=
kn-copyright=

en-aut-name=
en-aut-sei=
en-aut-mei=
kn-aut-name=ChegbelehLarry Pax
kn-aut-sei=Chegbeleh
kn-aut-mei=Larry Pax
aut-affil-num=1
ORCID=

en-aut-name=NishigakiMakoto
en-aut-sei=Nishigaki
en-aut-mei=Makoto
kn-aut-name=西垣誠
kn-aut-sei=西垣
kn-aut-mei=誠
aut-affil-num=2
ORCID=

en-aut-name=
en-aut-sei=
en-aut-mei=
kn-aut-name=AkudagoJohn Apambilla
kn-aut-sei=Akudago
kn-aut-mei=John Apambilla
aut-affil-num=3
ORCID=

en-aut-name=
en-aut-sei=
en-aut-mei=
kn-aut-name=AlimMd. Abdul
kn-aut-sei=Alim
kn-aut-mei=Md. Abdul
aut-affil-num=4
ORCID=

en-aut-name=KomatsuMitsuru
en-aut-sei=Komatsu
en-aut-mei=Mitsuru
kn-aut-name=小松満
kn-aut-sei=小松
kn-aut-mei=満
aut-affil-num=5
ORCID=

affil-num=1
en-affil=
kn-affil=岡山大学

affil-num=2
en-affil=
kn-affil=岡山大学

affil-num=3
en-affil=
kn-affil=岡山大学

affil-num=4
en-affil=
kn-affil=岡山大学

affil-num=5
en-affil=
kn-affil=岡山大学
en-keyword=Dynamic injection
kn-keyword=Dynamic injection
en-keyword=permeability
kn-keyword=permeability
en-keyword=swelling
kn-keyword=swelling
en-keyword=bentonite
kn-keyword=bentonite
en-keyword=clay
kn-keyword=clay
END

start-ver=1.4
cd-journal=joma
no-vol=14
cd-vols=
no-issue=1
article-no=
start-page=17
end-page=22
dt-received=
dt-revised=
dt-accepted=
dt-pub-year=2009
dt-pub=20090316
dt-online=
en-article=
kn-article=
en-subject=
kn-subject=
en-title=
kn-title=Capillary cut design for soil-groundwater salinity control
en-subtitle=
kn-subtitle=
en-abstract=
kn-abstract=Soil-groundwater salinity issues have assumed a worldwide dimension. It is believed that when groundwater level is less than 2 m there is the possibility of salinity transfer between the soil and groundwater due to factors such as capillary forces. One-dimensional column tests were conducted in the laboratory to find a suitable capillary cut design. The capillary cut material comprised a 20 cm thick 2?4.7 mm and a combination of 2?4.7 mm and 9.5?19 mm gravel material. In all, four different designs were tested by compacting Oji sand in the various columns. Groundwater level of 0.75 m from the top was maintained while salt solution of 10% concentration was allowed to flow under capillary forces through the columns. The water content in the columns were monitored using frequency domain reflectrometry-vector analyzer (FDR-V) after which soil samples from 10 m interval in each column was taken for electrical conductivity measurements. The results showed that 5 cm thick, 2?4.7 mm gravel sandwiching coarser material (e.g. 5 cm thick 9.5?19 mm or 10 cm thick 9.5?19 mm gravel material) proved to be very useful design to cut capillarity.
en-copyright=
kn-copyright=

en-aut-name=
en-aut-sei=
en-aut-mei=
kn-aut-name=AkudagoJohn Apambilla
kn-aut-sei=Akudago
kn-aut-mei=John Apambilla
aut-affil-num=1
ORCID=

en-aut-name=NishigakiMakoto
en-aut-sei=Nishigaki
en-aut-mei=Makoto
kn-aut-name=西垣誠
kn-aut-sei=西垣
kn-aut-mei=誠
aut-affil-num=2
ORCID=

en-aut-name=
en-aut-sei=
en-aut-mei=
kn-aut-name=ChegbelehLarry Pax
kn-aut-sei=Chegbeleh
kn-aut-mei=Larry Pax
aut-affil-num=3
ORCID=

en-aut-name=KomatsuMitsuru
en-aut-sei=Komatsu
en-aut-mei=Mitsuru
kn-aut-name=小松満
kn-aut-sei=小松
kn-aut-mei=満
aut-affil-num=4
ORCID=

en-aut-name=
en-aut-sei=
en-aut-mei=
kn-aut-name=AlimMd. Abdul
kn-aut-sei=Alim
kn-aut-mei=Md. Abdul
aut-affil-num=5
ORCID=

affil-num=1
en-affil=
kn-affil=岡山大学

affil-num=2
en-affil=
kn-affil=岡山大学

affil-num=3
en-affil=
kn-affil=岡山大学

affil-num=4
en-affil=
kn-affil=岡山大学

affil-num=5
en-affil=
kn-affil=岡山大学
en-keyword=soil-groundwater salinity
kn-keyword=soil-groundwater salinity
en-keyword=capillary cut
kn-keyword=capillary cut
en-keyword=filter media design
kn-keyword=filter media design
END

start-ver=1.4
cd-journal=joma
no-vol=14
cd-vols=
no-issue=1
article-no=
start-page=13
end-page=16
dt-received=
dt-revised=
dt-accepted=
dt-pub-year=2009
dt-pub=20090316
dt-online=
en-article=
kn-article=
en-subject=
kn-subject=
en-title=
kn-title=Determination of Soil-Water Characteristic Curves of Unsaturated Sandy Soils Using Membrane Filter with Stainless Wire Mesh
en-subtitle=
kn-subtitle=
en-abstract=
kn-abstract=Soil-water characteristic curve (SWCC) is an important soil function in an unsaturated soil mechanics field for design and analyses of any unsaturated earth structures. Determination of SWCC is not easy and more so time consuming. Generally, ceramic disc with high air-entry value has been used in the pressure plate apparatus for this purpose by many people. Now-a-days membrane filter is being used as a suitable alternative to ceramic disc. However, experience shows, it has disadvantage of breakage after one time use especially with coarse grain soils (sandy soils). In this study, membrane filter with stainless wire mesh was used to solve this problem and the SWWC was compared with the results obtained without wire mesh. Results showed that membrane filter with stainless wire mesh can be used to determine the SWCC for coarse grain soils.
en-copyright=
kn-copyright=

en-aut-name=
en-aut-sei=
en-aut-mei=
kn-aut-name=AlimMd. Abdul
kn-aut-sei=Alim
kn-aut-mei=Md. Abdul
aut-affil-num=1
ORCID=

en-aut-name=NishigakiMakoto
en-aut-sei=Nishigaki
en-aut-mei=Makoto
kn-aut-name=西垣誠
kn-aut-sei=西垣
kn-aut-mei=誠
aut-affil-num=2
ORCID=

en-aut-name=
en-aut-sei=
en-aut-mei=
kn-aut-name=ChegbelehLarry Pax
kn-aut-sei=Chegbeleh
kn-aut-mei=Larry Pax
aut-affil-num=3
ORCID=

en-aut-name=
en-aut-sei=
en-aut-mei=
kn-aut-name=AkudagoJohn Apambilla
kn-aut-sei=Akudago
kn-aut-mei=John Apambilla
aut-affil-num=4
ORCID=

en-aut-name=KomatsuMitsuru
en-aut-sei=Komatsu
en-aut-mei=Mitsuru
kn-aut-name=小松満
kn-aut-sei=小松
kn-aut-mei=満
aut-affil-num=5
ORCID=

affil-num=1
en-affil=
kn-affil=岡山大学

affil-num=2
en-affil=
kn-affil=岡山大学

affil-num=3
en-affil=
kn-affil=岡山大学

affil-num=4
en-affil=
kn-affil=岡山大学

affil-num=5
en-affil=
kn-affil=岡山大学
en-keyword=SWCC
kn-keyword=SWCC
en-keyword=Unsaturated sandy soils
kn-keyword=Unsaturated sandy soils
en-keyword=Membrane filter
kn-keyword=Membrane filter
en-keyword=Stainless wire mesh
kn-keyword=Stainless wire mesh
END

start-ver=1.4
cd-journal=joma
no-vol=13
cd-vols=
no-issue=1
article-no=
start-page=63
end-page=66
dt-received=
dt-revised=
dt-accepted=
dt-pub-year=2008
dt-pub=200803
dt-online=
en-article=
kn-article=
en-subject=
kn-subject=
en-title=
kn-title=State of the Art on Filter Design and Particle Clogging; and Proposed New Numerical Approach to Redesign
en-subtitle=
kn-subtitle=
en-abstract=
kn-abstract=Filters are essential in the design of embankments/dams, drains and wells for water and oil supplies. As
a result of these functions, filter use is increasing. In order to use the required filter, various empirical relations
have been given based on mathematical and field experience. However, these guidelines have not
worked to perfection considering the fact that clogging within the filter face is a serious challenge. A
short review on filter design criteria is given in this script coupled with a numerical formulation to propose
the design limits.
en-copyright=
kn-copyright=

en-aut-name=
en-aut-sei=
en-aut-mei=
kn-aut-name=Akudago ApambillaJohn
kn-aut-sei=Akudago Apambilla
kn-aut-mei=John
aut-affil-num=1
ORCID=

en-aut-name=NishigakiMakoto
en-aut-sei=Nishigaki
en-aut-mei=Makoto
kn-aut-name=西垣誠
kn-aut-sei=西垣
kn-aut-mei=誠
aut-affil-num=2
ORCID=

en-aut-name=
en-aut-sei=
en-aut-mei=
kn-aut-name=Chegbeleh LarryPax
kn-aut-sei=Chegbeleh Larry
kn-aut-mei=Pax
aut-affil-num=3
ORCID=

en-aut-name=
en-aut-sei=
en-aut-mei=
kn-aut-name=AlimMd. Abdul
kn-aut-sei=Alim
kn-aut-mei=Md. Abdul
aut-affil-num=4
ORCID=

en-aut-name=KomatsuMitsuru
en-aut-sei=Komatsu
en-aut-mei=Mitsuru
kn-aut-name=小松満
kn-aut-sei=小松
kn-aut-mei=満
aut-affil-num=5
ORCID=

en-aut-name=KumamaruKoji
en-aut-sei=Kumamaru
en-aut-mei=Koji
kn-aut-name=熊丸耕志
kn-aut-sei=熊丸
kn-aut-mei=耕志
aut-affil-num=6
ORCID=

affil-num=1
en-affil=
kn-affil=World Vision Ghana Rural Water Project

affil-num=2
en-affil=
kn-affil=岡山大学

affil-num=3
en-affil=
kn-affil=World Vision Ghana Rural Water Project

affil-num=4
en-affil=
kn-affil=岡山大学

affil-num=5
en-affil=
kn-affil=岡山大学

affil-num=6
en-affil=
kn-affil=岡山大学
en-keyword=filter
kn-keyword=filter
en-keyword=particle clogging
kn-keyword=particle clogging
en-keyword=filter classification
kn-keyword=filter classification
en-keyword=numerical model equation
kn-keyword=numerical model equation
en-keyword=force of attraction
kn-keyword=force of attraction
END

start-ver=1.4
cd-journal=joma
no-vol=13
cd-vols=
no-issue=1
article-no=
start-page=1
end-page=5
dt-received=
dt-revised=
dt-accepted=
dt-pub-year=2008
dt-pub=200803
dt-online=
en-article=
kn-article=
en-subject=
kn-subject=
en-title=
kn-title=Concepts of Repository and the Functions of Bentonite in Repository Environments: A State ? of ? the ? art review
en-subtitle=
kn-subtitle=
en-abstract=
kn-abstract=In an effort to secure the comfort of all aspect of life and security through electricity production, research, nuclear weapons production and medical uses, radioactive waste is being generated throughout the world as a result. Without pro ? active management and protection, the hazardous nature of radioactive materials can pose serious threats to human health and the environment. A waste containment or disposal
facility is required to isolate the waste from man and the biosphere to avoid any undue radiation exposure.
Deep geological repository or disposal facility is considered as an effective way to isolate high level radioactive
waste, HLW from the human environment, for which a multi ? barrier system plays a very significant role. In this paper, literature collection was carried out, aimed to overview the present knowledge about the concepts of repository for HLW and to identify technologies that are currently available in the nuclear industry worldwide and the current state of barrier technologies for hazardous waste sites.
en-copyright=
kn-copyright=

en-aut-name=
en-aut-sei=
en-aut-mei=
kn-aut-name=ChegbelehLarry Pax
kn-aut-sei=Chegbeleh
kn-aut-mei=Larry Pax
aut-affil-num=1
ORCID=

en-aut-name=NishigakiMakoto
en-aut-sei=Nishigaki
en-aut-mei=Makoto
kn-aut-name=西垣誠
kn-aut-sei=西垣
kn-aut-mei=誠
aut-affil-num=2
ORCID=

en-aut-name=
en-aut-sei=
en-aut-mei=
kn-aut-name=AkudagoJohn Apambilla
kn-aut-sei=Akudago
kn-aut-mei=John Apambilla
aut-affil-num=3
ORCID=

en-aut-name=
en-aut-sei=
en-aut-mei=
kn-aut-name=AlimMd. Abdul
kn-aut-sei=Alim
kn-aut-mei=Md. Abdul
aut-affil-num=4
ORCID=

en-aut-name=KomatsuMitsuru
en-aut-sei=Komatsu
en-aut-mei=Mitsuru
kn-aut-name=小松満
kn-aut-sei=小松
kn-aut-mei=満
aut-affil-num=5
ORCID=

affil-num=1
en-affil=
kn-affil=World Vision Ghana Rural Water Project

affil-num=2
en-affil=
kn-affil=岡山大学

affil-num=3
en-affil=
kn-affil=World Vision Ghana Rural Water Project

affil-num=4
en-affil=
kn-affil=岡山大学

affil-num=5
en-affil=
kn-affil=岡山大学
en-keyword=repository
kn-keyword=repository
en-keyword=bentonite
kn-keyword=bentonite
en-keyword=radioactive waste
kn-keyword=radioactive waste
en-keyword=swelling
kn-keyword=swelling
en-keyword=buffer and backfill materials
kn-keyword=buffer and backfill materials
END

start-ver=1.4
cd-journal=joma
no-vol=2
cd-vols=
no-issue=1
article-no=
start-page=33
end-page=50
dt-received=
dt-revised=
dt-accepted=
dt-pub-year=1997
dt-pub=19970110
dt-online=
en-article=
kn-article=
en-subject=
kn-subject=
en-title=Research on Prevention of Groundwater Flow Blockage by the Detour Permeation Method
kn-title=迂回浸透工法による流況阻害の防止工法に関する研究
en-subtitle=
kn-subtitle=
en-abstract=
kn-abstract=With the increase of underground construction in metropolitan areas in recent years, the problem of associated earth retaining works cutting off the natural flow of groundwater has increased in both scale and extent. The authors are proposing a new diaphragm wall method that does not inhibit the flow of groundwater. This paper describes the verification of the detour permeation achieved by the new diaphragm wall method and the experimental results related to the blockage of this groundwater flow.
en-copyright=
kn-copyright=

en-aut-name=SatohTsuneo
en-aut-sei=Satoh
en-aut-mei=Tsuneo
kn-aut-name=佐藤常雄
kn-aut-sei=佐藤
kn-aut-mei=常雄
aut-affil-num=1
ORCID=

en-aut-name=NishigakiMakoto
en-aut-sei=Nishigaki
en-aut-mei=Makoto
kn-aut-name=西垣誠
kn-aut-sei=西垣
kn-aut-mei=誠
aut-affil-num=2
ORCID=

affil-num=1
en-affil=
kn-affil=(株)錢高組土木本部

affil-num=2
en-affil=
kn-affil=岡山大学
END

start-ver=1.4
cd-journal=joma
no-vol=2
cd-vols=
no-issue=1
article-no=
start-page=25
end-page=32
dt-received=
dt-revised=
dt-accepted=
dt-pub-year=1997
dt-pub=19970110
dt-online=
en-article=
kn-article=
en-subject=
kn-subject=
en-title=
kn-title=Applied Fiber Optic Measurement for Geohydraulic Engineering
en-subtitle=
kn-subtitle=
en-abstract=
kn-abstract=Engineers have long sought the possibility of measuring parameters such as temperature and pressure continuously in the underground with high precision, high spatial resolution and high band width of parameters. Distributed fibre optic measurement offers the use of a very fast, robust, precise, light and small gauges with an high spatial resolution. In this paper we would like to compile fibre-optic measure-methods which are available now for projects in geohydraulical engineering. This paper will propose new problems for future research work on parameter identification for such parameters as conductivity and anisotropy.
en-copyright=
kn-copyright=

en-aut-name=NishigakiMakoto
en-aut-sei=Nishigaki
en-aut-mei=Makoto
kn-aut-name=西垣誠
kn-aut-sei=西垣
kn-aut-mei=誠
aut-affil-num=1
ORCID=

en-aut-name=
en-aut-sei=
en-aut-mei=
kn-aut-name=SchreckMartin
kn-aut-sei=Schreck
kn-aut-mei=Martin
aut-affil-num=2
ORCID=

affil-num=1
en-affil=
kn-affil=岡山大学

affil-num=2
en-affil=
kn-affil=岡山大学
END

start-ver=1.4
cd-journal=joma
no-vol=5
cd-vols=
no-issue=1
article-no=
start-page=107
end-page=112
dt-received=
dt-revised=
dt-accepted=
dt-pub-year=2000
dt-pub=20000229
dt-online=
en-article=
kn-article=
en-subject=
kn-subject=
en-title=
kn-title=Laboratory Experiment on Failure of Embankment
en-subtitle=
kn-subtitle=
en-abstract=
kn-abstract=Failures of railway embankments in Japan usually occur during rainfall period due to the rise of water level in the embankments. Laboratory experiments were carried out to elucidate the initiation of failure of embankment under the rise of water level. The changes in pore-water pressure were monitored during the rise of water table and at the initiation of failures. The experiment results showed that main failure of embankment was initiated by development of localized unstable area at the toe of the embankment models during the rise of water level. This indicates that failure of embankments was a consequence of instability of the toe of the slope induced by saturation process under drained condition.
en-copyright=
kn-copyright=

en-aut-name=
en-aut-sei=
en-aut-mei=
kn-aut-name=TohariAdrin
kn-aut-sei=Tohari
kn-aut-mei=Adrin
aut-affil-num=1
ORCID=

en-aut-name=NishigakiMakoto
en-aut-sei=Nishigaki
en-aut-mei=Makoto
kn-aut-name=西垣誠
kn-aut-sei=西垣
kn-aut-mei=誠
aut-affil-num=2
ORCID=

en-aut-name=KomatsuMitsuru
en-aut-sei=Komatsu
en-aut-mei=Mitsuru
kn-aut-name=小松満
kn-aut-sei=小松
kn-aut-mei=満
aut-affil-num=3
ORCID=

affil-num=1
en-affil=
kn-affil=岡山大学

affil-num=2
en-affil=
kn-affil=岡山大学

affil-num=3
en-affil=
kn-affil=岡山大学
en-keyword=embankment
kn-keyword=embankment
en-keyword=failure process
kn-keyword=failure process
en-keyword=seepage face
kn-keyword=seepage face
en-keyword=toe failure
kn-keyword=toe failure
en-keyword=overall instability
kn-keyword=overall instability
END

start-ver=1.4
cd-journal=joma
no-vol=6
cd-vols=
no-issue=1
article-no=
start-page=47
end-page=52
dt-received=
dt-revised=
dt-accepted=
dt-pub-year=2001
dt-pub=20010228
dt-online=
en-article=
kn-article=
en-subject=
kn-subject=
en-title=
kn-title=Study on Measuring System of Subsurface Contamination using Complex Dielectric Method
en-subtitle=
kn-subtitle=
en-abstract=
kn-abstract=For evaluating subsurface contamination, sampling method (boring) is commonly used, but this method cannot monitor the change of in-situ contamination and concentration with respect to time. The purpose of this study is to develop a measuring system for subsurface contamination in which a so-called FDR-V system (Frequency Domain Reflectometry with Vector network analyzer) was employed to measure the salinity contaminant. This FDR-V method is a coaxial probe method,which allows the measurement of the complex dielectric constant from 1GHz to 18GHz. The experimental study indicates the possibility in measuring both the salinity concentration and volumetric moisture content.
en-copyright=
kn-copyright=

en-aut-name=KomatsuMitsuru
en-aut-sei=Komatsu
en-aut-mei=Mitsuru
kn-aut-name=小松満
kn-aut-sei=小松
kn-aut-mei=満
aut-affil-num=1
ORCID=

en-aut-name=NishigakiMakoto
en-aut-sei=Nishigaki
en-aut-mei=Makoto
kn-aut-name=西垣誠
kn-aut-sei=西垣
kn-aut-mei=誠
aut-affil-num=2
ORCID=

affil-num=1
en-affil=
kn-affil=岡山大学

affil-num=2
en-affil=
kn-affil=岡山大学
en-keyword=Dielectric constant
kn-keyword=Dielectric constant
en-keyword=Subsurface
kn-keyword=Subsurface
en-keyword=Salinity concentration
kn-keyword=Salinity concentration
en-keyword=Volumetric moisture content
kn-keyword=Volumetric moisture content
END

start-ver=1.4
cd-journal=joma
no-vol=8
cd-vols=
no-issue=1
article-no=
start-page=53
end-page=62
dt-received=
dt-revised=
dt-accepted=
dt-pub-year=2003
dt-pub=200303
dt-online=
en-article=
kn-article=
en-subject=
kn-subject=
en-title=
kn-title=Floods in Bangladesh: A Comparative Hydrological Investigation on Two Catastrophic Events
en-subtitle=
kn-subtitle=
en-abstract=
kn-abstract=Flood becomes regular feature in riverrine Bangladesh. Every year, around 21 percent of land is flooded during monsoon season, however, in severe situation this figure shot up to more than 60 percent of total land. This paper is an attempt to analyze hydrological characteristics of two catastrophic events (1988 and 1998 flood) in the light of flood history in Bangladesh. The analysis demonstrates that the 1998 flood was more severe than the 1988 one. Moreover, the 1998 flood was also prolonged than the 1988 flood due to heavy rainfall inside and outside of the country. Finally, flood management issues in Bangladesh have been analyzed and found that structural solution to mitigate flood is not the only solution. Based on the analysis some possible mitigation options are put foward.
en-copyright=
kn-copyright=

en-aut-name=A.M.Dewan
en-aut-sei=A.M.
en-aut-mei=Dewan
kn-aut-name=A.M.Dewan
kn-aut-sei=A.M.
kn-aut-mei=Dewan
aut-affil-num=1
ORCID=

en-aut-name=NishigakiMakoto
en-aut-sei=Nishigaki
en-aut-mei=Makoto
kn-aut-name=西垣誠
kn-aut-sei=西垣
kn-aut-mei=誠
aut-affil-num=2
ORCID=

en-aut-name=KomatsuMitsuru
en-aut-sei=Komatsu
en-aut-mei=Mitsuru
kn-aut-name=小松満
kn-aut-sei=小松
kn-aut-mei=満
aut-affil-num=3
ORCID=

affil-num=1
en-affil=
kn-affil=岡山大学

affil-num=2
en-affil=
kn-affil=岡山大学

affil-num=3
en-affil=
kn-affil=岡山大学
en-keyword=Flood
kn-keyword=Flood
en-keyword=Flood Management
kn-keyword=Flood Management
en-keyword=Danger level
kn-keyword=Danger level
en-keyword=Peak floods
kn-keyword=Peak floods
en-keyword=Deforestation
kn-keyword=Deforestation
END

start-ver=1.4
cd-journal=joma
no-vol=10
cd-vols=
no-issue=1
article-no=
start-page=83
end-page=88
dt-received=
dt-revised=
dt-accepted=
dt-pub-year=2005
dt-pub=20050228
dt-online=
en-article=
kn-article=
en-subject=
kn-subject=
en-title=
kn-title=Sustainable Groundwater Exploitation under Natural Conditions in Southwest Ghana
en-subtitle=
kn-subtitle=
en-abstract=
kn-abstract=Groundwater has been recognised as the most cost-effective option of safe water supply to rural communities in Ghana. The demand for potable water has led to the drilling of a large number of boreholes in many parts of the country. To establish the threshold of groundwater development from storage in a major river catchment (Pra River) in South-West Ghana, studies on recharge to the weathered aquifer and statistical evaluations of specific capacity and potential yield have been carried out. The SACSMA conceptual hydrological modelling system was used for the recharge estimate. With recharge rate of 50 mm/yr, the natural groundwater resources in the basin was estimated to support a maximum withdrawal of 12 l/s for a 10 hour per day pumping. The groundwater resources potential of 1.6 l/sｋ�u could be considered the threshold of groundwater exploitation in similar river basins in South-West Ghana. A study into the relation between permeability and recharge under different conditions and scenarios is required to define their limiting role in groundwater resources development.
en-copyright=
kn-copyright=

en-aut-name=
en-aut-sei=
en-aut-mei=
kn-aut-name=Kankam-YeboahKwabena
kn-aut-sei=Kankam-Yeboah
kn-aut-mei=Kwabena
aut-affil-num=1
ORCID=

en-aut-name=
en-aut-sei=
en-aut-mei=
kn-aut-name=DarkoPhilip K.
kn-aut-sei=Darko
kn-aut-mei=Philip K.
aut-affil-num=2
ORCID=

en-aut-name=NishigakiMakoto
en-aut-sei=Nishigaki
en-aut-mei=Makoto
kn-aut-name=西垣誠
kn-aut-sei=西垣
kn-aut-mei=誠
aut-affil-num=3
ORCID=

affil-num=1
en-affil=
kn-affil=岡山大学

affil-num=2
en-affil=
kn-affil=CSIR-Water Research Institute

affil-num=3
en-affil=
kn-affil=岡山大学
en-keyword=Groundwater storage
kn-keyword=Groundwater storage
en-keyword=recharge
kn-keyword=recharge
en-keyword=aquifer
kn-keyword=aquifer
en-keyword=specific capacity
kn-keyword=specific capacity
en-keyword=base flow
kn-keyword=base flow
en-keyword=hydrologic budget
kn-keyword=hydrologic budget
END

start-ver=1.4
cd-journal=joma
no-vol=10
cd-vols=
no-issue=1
article-no=
start-page=75
end-page=81
dt-received=
dt-revised=
dt-accepted=
dt-pub-year=2005
dt-pub=20050228
dt-online=
en-article=
kn-article=
en-subject=
kn-subject=
en-title=
kn-title=Rapid Impact Assessment Matrix (RIAM) - An Analytical Tool in the Prioritization of Water Resources Management Problems in Ghana
en-subtitle=
kn-subtitle=
en-abstract=
kn-abstract=The rapid impact assessment (RIAM), which was developed in Denmark, is a new tool for the execution of environmental impact assessments. RIAM is quite flexible, transparent and leaves a permanent record, which can be independently checked, validated or updated. RIAM has successfully been used to prioritize water resources management problems in Ghana in the order of which problems call for the most urgent attention. The priority list was easily validated and accepted to be the true reflection of the situation at a national workshop in which experts and representatives from water agencies, donor agencies, university faculties and departments, research institutes, private institutions and organizations including Non Governmental Organizations (NGOs) participated. The study has shown that RIAM, which can also be used in a developing country like Ghana, is a very useful tool in such prioritization process as has been applied in this exercise.
en-copyright=
kn-copyright=

en-aut-name=
en-aut-sei=
en-aut-mei=
kn-aut-name=Kankam-YeboahKwabena
kn-aut-sei=Kankam-Yeboah
kn-aut-mei=Kwabena
aut-affil-num=1
ORCID=

en-aut-name=
en-aut-sei=
en-aut-mei=
kn-aut-name=AsareEnoch B.
kn-aut-sei=Asare
kn-aut-mei=Enoch B.
aut-affil-num=2
ORCID=

en-aut-name=Gyau-BoakyePhilip
en-aut-sei=Gyau-Boakye
en-aut-mei=Philip
kn-aut-name=Gyau-BoakyePhilip
kn-aut-sei=Gyau-Boakye
kn-aut-mei=Philip
aut-affil-num=3
ORCID=

en-aut-name=NishigakiMakoto
en-aut-sei=Nishigaki
en-aut-mei=Makoto
kn-aut-name=西垣誠
kn-aut-sei=西垣
kn-aut-mei=誠
aut-affil-num=4
ORCID=

affil-num=1
en-affil=
kn-affil=岡山大学

affil-num=2
en-affil=
kn-affil=CSIR-Water Research Institute

affil-num=3
en-affil=
kn-affil=CSIR-Water Research Institute

affil-num=4
en-affil=
kn-affil=岡山大学
en-keyword=Water resources management problems
kn-keyword=Water resources management problems
en-keyword=prioritization
kn-keyword=prioritization
en-keyword=impact indicators
kn-keyword=impact indicators
en-keyword=RIAM
kn-keyword=RIAM
en-keyword=river basins
kn-keyword=river basins
en-keyword=Ghana
kn-keyword=Ghana
END

start-ver=1.4
cd-journal=joma
no-vol=8
cd-vols=
no-issue=1
article-no=
start-page=39
end-page=52
dt-received=
dt-revised=
dt-accepted=
dt-pub-year=2003
dt-pub=200303
dt-online=
en-article=
kn-article=
en-subject=
kn-subject=
en-title=
kn-title=The Hydrogeological Setting of Ghana and the Potential for Underground Dams
en-subtitle=
kn-subtitle=
en-abstract=
kn-abstract=Increasing human population, changing lifestyles and environmental considerations have resulted in increased utilization of groundwater resources worldwide. Thus, in turn, has led to the decline of groundwater levels in some countries and Ghana is no exception to this problem. To augment the availability of groundwater resources for various uses, numerous techniques have been developed in many part of the world, one of which is the construction of underground dams. The successful construction and utilization of underground dams, however, depends very much on the physical and hydrogeological conditions at the dam sites. Ghana is underlain by Precambrian crystalline igneous and metamorphic rocks ; and Paleozoic consolidated sedimentary formations. There are further subdivided and described locally as the Birimian, Dahomeyan, Buem, Togo Series, Tarkwaian, Granites, Voltain, Coastal Block Fault, Coastal Plain and Quaternary Alluvium. The review of these and the pre-requisite conditions necessary for the construction of underground dams indicate that underground dams could be constructed and utilized in some parts of Ghana, especially where the overburden is shallow, in the Dahomeyan granites and in the recent formations consisting of alluvial and coastal sands and gravels. This paper is part of a continuing research programme being carried out by the authors.
en-copyright=
kn-copyright=

en-aut-name=
en-aut-sei=
en-aut-mei=
kn-aut-name=Kankam-YeboahKwabena
kn-aut-sei=Kankam-Yeboah
kn-aut-mei=Kwabena
aut-affil-num=1
ORCID=

en-aut-name=
en-aut-sei=
en-aut-mei=
kn-aut-name=Dapaah-SiakwanStephen
kn-aut-sei=Dapaah-Siakwan
kn-aut-mei=Stephen
aut-affil-num=2
ORCID=

en-aut-name=NishigakiMakoto
en-aut-sei=Nishigaki
en-aut-mei=Makoto
kn-aut-name=西垣誠
kn-aut-sei=西垣
kn-aut-mei=誠
aut-affil-num=3
ORCID=

en-aut-name=KomatsuMitsuru
en-aut-sei=Komatsu
en-aut-mei=Mitsuru
kn-aut-name=小松満
kn-aut-sei=小松
kn-aut-mei=満
aut-affil-num=4
ORCID=

affil-num=1
en-affil=
kn-affil=岡山大学

affil-num=2
en-affil=
kn-affil=Water Research Institute (CSIR)

affil-num=3
en-affil=
kn-affil=岡山大学

affil-num=4
en-affil=
kn-affil=岡山大学
en-keyword=hydrogeology
kn-keyword=hydrogeology
en-keyword=geology
kn-keyword=geology
en-keyword=underground dam
kn-keyword=underground dam
en-keyword=sand-storage dam
kn-keyword=sand-storage dam
en-keyword=sub-surface dam
kn-keyword=sub-surface dam
en-keyword=water supply
kn-keyword=water supply
END

start-ver=1.4
cd-journal=joma
no-vol=10
cd-vols=
no-issue=1
article-no=
start-page=67
end-page=74
dt-received=
dt-revised=
dt-accepted=
dt-pub-year=2005
dt-pub=20050228
dt-online=
en-article=
kn-article=
en-subject=
kn-subject=
en-title=
kn-title=Evaluating Flood Damage using GIS and RADARSAT data-A case of the 1998 Catastrophe in Greater Dhaka, Bangladesh
en-subtitle=
kn-subtitle=
en-abstract=
kn-abstract=The objective of this paper is to delineate flood prone areas and estimate damage in Greater Dhaka during the 1998 catastrophic flood using an integrated approach of GIS and remote sensing. Time series RADARSAT SAR data is acquired and used to demarcate flood boundaries for the 1998 flood event. This was accomplished by thresholding linear SAR imageries. Flood estimation demonstrated that flood areas steadily increased from early July 1998 and peaked on 25 August 1998 inundating 53% lands due to heavy monsoonal downpour and discharge from upstream points. Different thematic layers were combined with a derived flood map in order to assess flood damage for the same event. Flood damage analysis revealed that substantial damage has occurred in Greater Dhaka during the 1998 flood.
en-copyright=
kn-copyright=

en-aut-name=
en-aut-sei=
en-aut-mei=
kn-aut-name=DewanAshraf M.
kn-aut-sei=Dewan
kn-aut-mei=Ashraf M.
aut-affil-num=1
ORCID=

en-aut-name=
en-aut-sei=
en-aut-mei=
kn-aut-name=AlamMd. Mahabubul
kn-aut-sei=Alam
kn-aut-mei=Md. Mahabubul
aut-affil-num=2
ORCID=

en-aut-name=NishigakiMakoto
en-aut-sei=Nishigaki
en-aut-mei=Makoto
kn-aut-name=西垣誠
kn-aut-sei=西垣
kn-aut-mei=誠
aut-affil-num=3
ORCID=

affil-num=1
en-affil=
kn-affil=岡山大学

affil-num=2
en-affil=
kn-affil=Department of Geography & Environment, University of Dhaka

affil-num=3
en-affil=
kn-affil=岡山大学
en-keyword=Synthetic Aperture Radar (SAR)
kn-keyword=Synthetic Aperture Radar (SAR)
en-keyword=flood delineation
kn-keyword=flood delineation
en-keyword=1998 flood
kn-keyword=1998 flood
en-keyword=flood damage
kn-keyword=flood damage
en-keyword=Greater Dhaka
kn-keyword=Greater Dhaka
END

start-ver=1.4
cd-journal=joma
no-vol=10
cd-vols=
no-issue=1
article-no=
start-page=57
end-page=65
dt-received=
dt-revised=
dt-accepted=
dt-pub-year=2005
dt-pub=20050228
dt-online=
en-article=
kn-article=
en-subject=
kn-subject=
en-title=
kn-title=Remote Sensing of 1998 and 2000 Floods in Greater Dhaka, Bangladesh: Experiences from Catastrophic and Normal events
en-subtitle=
kn-subtitle=
en-abstract=
kn-abstract=This paper is an attempt to develop a series of maps that precisely depict flood prone areas in Greater Dhaka, Bangladesh using remote sensing techniques. Multi-temporal RADARSAT SAR data were acquired and employed to delineate open water flood boundary during the floods of 1998 and 2000. Using a threshold algorithm, SAR data is segregated into water and non-water areas. The empirical threshold value was obtained by using visual interpretation technique, local knowledge of the study site and by deriving corresponding pixel values to land/water from each image. The result demonstrated that 53 percent of the study area was heavily inundated in 1998 flood which is the largest submerged area during a catastrophic scenario. In contrast, 35.32 percent area was flooded during the year 2000 which represents the area under water for a normal event. Using the reference data acquired from field visit, derived flood maps were further validated. Moderate accuracy is obtained for all flood maps, however, July 1998 image attained the highest overall accuracy (86%) in the dataset. The derived flood maps are expected to be useful to mitigate losses of lives and property from river water flooding in Greater Dhaka. Furthermore, this information would be worthwhile to develop an efficient flood disaster management system.
en-copyright=
kn-copyright=

en-aut-name=
en-aut-sei=
en-aut-mei=
kn-aut-name=DewanAshraf M.
kn-aut-sei=Dewan
kn-aut-mei=Ashraf M.
aut-affil-num=1
ORCID=

en-aut-name=
en-aut-sei=
en-aut-mei=
kn-aut-name=AlamMd. Mahabubul
kn-aut-sei=Alam
kn-aut-mei=Md. Mahabubul
aut-affil-num=2
ORCID=

en-aut-name=NishigakiMakoto
en-aut-sei=Nishigaki
en-aut-mei=Makoto
kn-aut-name=西垣誠
kn-aut-sei=西垣
kn-aut-mei=誠
aut-affil-num=3
ORCID=

affil-num=1
en-affil=
kn-affil=岡山大学

affil-num=2
en-affil=
kn-affil=Department of Geography & Environment, University of Dhaka

affil-num=3
en-affil=
kn-affil=岡山大学
en-keyword=SAR
kn-keyword=SAR
en-keyword=open water flood
kn-keyword=open water flood
en-keyword=1998 and 2000 floods
kn-keyword=1998 and 2000 floods
en-keyword=Greater Dhaka
kn-keyword=Greater Dhaka
en-keyword=RADARSAT
kn-keyword=RADARSAT
END

start-ver=1.4
cd-journal=joma
no-vol=9
cd-vols=
no-issue=1
article-no=
start-page=99
end-page=110
dt-received=
dt-revised=
dt-accepted=
dt-pub-year=2004
dt-pub=20040227
dt-online=
en-article=
kn-article=
en-subject=
kn-subject=
en-title=
kn-title=DEM based Flood Extent Delineation in Dhaka City, Bangladesh
en-subtitle=
kn-subtitle=
en-abstract=
kn-abstract=Dhaka city, the capital of Bangladesh and home for more than 10 million people, has been affected by seasonal flooding almost in every year, however, the situation aggravates depending on rainfall and surrounding river waters. The aim of this paper is to delineate the flood extent in Dhaka city using digital elevation model (DEM), an integral part of geographic information system. Catastrophic floods of the 1988 and 1998 events are taken into consideration. Hydro-meteorological assessment of these events revealed that the 1988 flood was severe due to the lack of flood protection in the city together with transboundary flow of the major rivers while the 1998 flood was become deluge due to incessant monsoonal downpour along with early peaked of the river water levels. The 1998 event has done colossal damage in the city compare to the 1988 event. Flood extent estimation showed that DEM data is very precious to model inundation in the city, however, in order to be spatially explicit flood model, high resolution DEM is necessary. Finally, flood management issues are reviewed and found that combination of structural and nonstructural measures are necessary to help reducing flood induced losses and damage in the city.
en-copyright=
kn-copyright=

en-aut-name=
en-aut-sei=
en-aut-mei=
kn-aut-name=DewanA.M.
kn-aut-sei=Dewan
kn-aut-mei=A.M.
aut-affil-num=1
ORCID=

en-aut-name=NishigakiMakoto
en-aut-sei=Nishigaki
en-aut-mei=Makoto
kn-aut-name=西垣誠
kn-aut-sei=西垣
kn-aut-mei=誠
aut-affil-num=2
ORCID=

en-aut-name=KomatsuMitsuru
en-aut-sei=Komatsu
en-aut-mei=Mitsuru
kn-aut-name=小松満
kn-aut-sei=小松
kn-aut-mei=満
aut-affil-num=3
ORCID=

affil-num=1
en-affil=
kn-affil=岡山大学

affil-num=2
en-affil=
kn-affil=岡山大学

affil-num=3
en-affil=
kn-affil=岡山大学
en-keyword=Dhaka City
kn-keyword=Dhaka City
en-keyword=Floods
kn-keyword=Floods
en-keyword=Digital Elevation Model
kn-keyword=Digital Elevation Model
en-keyword=1998 and 1988 Floods
kn-keyword=1998 and 1988 Floods
END

start-ver=1.4
cd-journal=joma
no-vol=9
cd-vols=
no-issue=1
article-no=
start-page=87
end-page=98
dt-received=
dt-revised=
dt-accepted=
dt-pub-year=2004
dt-pub=20040227
dt-online=
en-article=
kn-article=
en-subject=
kn-subject=
en-title=
kn-title=Water Resources and Environmental Management in Ghana
en-subtitle=
kn-subtitle=
en-abstract=
kn-abstract=Three principal river basins are found in Ghana and the Volta River Basin is the major one, covering about three -quarters of Ghana. The basin is shared with Mali, Burkina Faso, Cote d'Ivoire, Togo and Benin. Water from the Volta River Basin is used for drinking water supply, generating hydro-electric power, irrigation, inland fisheries and lake transport. The sustainable management of the Volta River Basin is thus of great importance. Land use activities in the basin are thus closely monitored not only in Ghana, but also in the other riparian countries as well. This paper presents information and data on the water resources and environmental management of the Volta River Basin in Ghana.
en-copyright=
kn-copyright=

en-aut-name=
en-aut-sei=
en-aut-mei=
kn-aut-name=Kankam-YeboahKwabena
kn-aut-sei=Kankam-Yeboah
kn-aut-mei=Kwabena
aut-affil-num=1
ORCID=

en-aut-name=
en-aut-sei=
en-aut-mei=
kn-aut-name=Gyau-BoakyePhilip
kn-aut-sei=Gyau-Boakye
kn-aut-mei=Philip
aut-affil-num=2
ORCID=

en-aut-name=NishigakiMakoto
en-aut-sei=Nishigaki
en-aut-mei=Makoto
kn-aut-name=西垣誠
kn-aut-sei=西垣
kn-aut-mei=誠
aut-affil-num=3
ORCID=

en-aut-name=KomatsuMitsuru
en-aut-sei=Komatsu
en-aut-mei=Mitsuru
kn-aut-name=小松満
kn-aut-sei=小松
kn-aut-mei=満
aut-affil-num=4
ORCID=

affil-num=1
en-affil=
kn-affil=岡山大学

affil-num=2
en-affil=
kn-affil=岡山大学

affil-num=3
en-affil=
kn-affil=岡山大学

affil-num=4
en-affil=
kn-affil=岡山大学
en-keyword=water resources
kn-keyword=water resources
en-keyword=environmental management
kn-keyword=environmental management
en-keyword=Volta River Basin
kn-keyword=Volta River Basin
en-keyword=Ghana
kn-keyword=Ghana
en-keyword=water utilization
kn-keyword=water utilization
END

start-ver=1.4
cd-journal=joma
no-vol=11
cd-vols=
no-issue=1
article-no=
start-page=57
end-page=64
dt-received=
dt-revised=
dt-accepted=
dt-pub-year=2006
dt-pub=20060315
dt-online=
en-article=
kn-article=
en-subject=
kn-subject=
en-title=Measuring Method of Water Content for High compacted Bentonite Block by using Frequency Domain Reflectometry
kn-title=FDR法による高配合圧縮ベントナイト系材料の水分量測定方法に関する研究
en-subtitle=
kn-subtitle=
en-abstract=
kn-abstract=In the high-level radioactive waste disposal project, in order to know the infiltration behavior, it have to be examined that the bentonite buffer material is used as a barrier, and the measuring device of moisture with the high accuracy is required. In this study it is discussed the usefulness for Frequency Domain Refrectometry (FDR) method through the measuring dielectric constant and making the calibration curve for the several kinds of bentonite material block (pure and silica sand mixing).
en-copyright=
kn-copyright=

en-aut-name=NishigakiMakoto
en-aut-sei=Nishigaki
en-aut-mei=Makoto
kn-aut-name=西垣誠
kn-aut-sei=西垣
kn-aut-mei=誠
aut-affil-num=1
ORCID=

en-aut-name=KomatsuMitsuru
en-aut-sei=Komatsu
en-aut-mei=Mitsuru
kn-aut-name=小松満
kn-aut-sei=小松
kn-aut-mei=満
aut-affil-num=2
ORCID=

en-aut-name=ChijimatsuMasakazu
en-aut-sei=Chijimatsu
en-aut-mei=Masakazu
kn-aut-name=千々松正和
kn-aut-sei=千々松
kn-aut-mei=正和
aut-affil-num=3
ORCID=

affil-num=1
en-affil=
kn-affil=岡山大学

affil-num=2
en-affil=
kn-affil=岡山大学

affil-num=3
en-affil=
kn-affil=間組技術･環境本部原子力部
en-keyword=Measuring syatem
kn-keyword=Measuring syatem
en-keyword=Bentonite
kn-keyword=Bentonite
en-keyword=Volumetric mousture content
kn-keyword=Volumetric mousture content
en-keyword=Frequency domain reflectometry
kn-keyword=Frequency domain reflectometry
END

start-ver=1.4
cd-journal=joma
no-vol=11
cd-vols=
no-issue=1
article-no=
start-page=51
end-page=55
dt-received=
dt-revised=
dt-accepted=
dt-pub-year=2006
dt-pub=20060315
dt-online=
en-article=
kn-article=
en-subject=
kn-subject=
en-title=
kn-title=Laboratory Verification of a Proposed New Method to Determine the In-Situ Effective Porosity of Unsaturated Soil
en-subtitle=
kn-subtitle=
en-abstract=
kn-abstract=A laboratory validation of a proposed new method of determining the in-situ effective porosity of unsaturated soils was carried out on unsaturated river sand. The proposed method consists of boring a small diameter hole into the soil and inserting an Amplitude Domain Reflectometry (ADR) probe at the bottom part of the hole. Water is supplied into the hole till saturation and later de-saturated. The water content with time is determined from the ADR probe voltage potential readings. The effective porosity is determined from the difference between the saturated and de-saturated water contents. However, in the laboratory, the water is supplied through the top and bottom parts of the sample. From the experiments the obtained effective porosity ranged from 0.28 to 0.29 for wetting from the top with an average of 0.287 and 0.29 to 0.30 for wetting from the bottom with an average of 0.293. The determined effective porosity ranged from 71.7-73.3% of the real initial porosity of 0.40 of the river sand. The maximum attained degree of saturation during the experiment was 91%. The results indicated that the method will be suitable and useful in determining the effective porosity of medium grained unsaturated soils.
en-copyright=
kn-copyright=

en-aut-name=NishigakiMakoto
en-aut-sei=Nishigaki
en-aut-mei=Makoto
kn-aut-name=西垣誠
kn-aut-sei=西垣
kn-aut-mei=誠
aut-affil-num=1
ORCID=

en-aut-name=KomatsuMitsuru
en-aut-sei=Komatsu
en-aut-mei=Mitsuru
kn-aut-name=小松満
kn-aut-sei=小松
kn-aut-mei=満
aut-affil-num=2
ORCID=

en-aut-name=
en-aut-sei=
en-aut-mei=
kn-aut-name=AkudagoJohn Apambilla
kn-aut-sei=Akudago
kn-aut-mei=John Apambilla
aut-affil-num=3
ORCID=

en-aut-name=
en-aut-sei=
en-aut-mei=
kn-aut-name=ShinshiYoshihide
kn-aut-sei=Shinshi
kn-aut-mei=Yoshihide
aut-affil-num=4
ORCID=

en-aut-name=
en-aut-sei=
en-aut-mei=
kn-aut-name=KawakamiKenji
kn-aut-sei=Kawakami
kn-aut-mei=Kenji
aut-affil-num=5
ORCID=

en-aut-name=
en-aut-sei=
en-aut-mei=
kn-aut-name=KumamaruKoji
kn-aut-sei=Kumamaru
kn-aut-mei=Koji
aut-affil-num=6
ORCID=

affil-num=1
en-affil=
kn-affil=岡山大学

affil-num=2
en-affil=
kn-affil=岡山大学

affil-num=3
en-affil=
kn-affil=岡山大学

affil-num=4
en-affil=
kn-affil=岡山大学

affil-num=5
en-affil=
kn-affil=岡山大学

affil-num=6
en-affil=
kn-affil=岡山大学
en-keyword=Underground dam
kn-keyword=Underground dam
en-keyword=Effective porosity
kn-keyword=Effective porosity
en-keyword=Storage capacity
kn-keyword=Storage capacity
en-keyword=Freshwater development
kn-keyword=Freshwater development
END