start-ver=1.4
cd-journal=joma
no-vol=4
cd-vols=
no-issue=1
article-no=
start-page=81
end-page=92
dt-received=
dt-revised=
dt-accepted=
dt-pub-year=1999
dt-pub=19990226
dt-online=
en-article=
kn-article=
en-subject=
kn-subject=
en-title=
kn-title=In situ determination of field-saturated hydraulic conductivity of subsurface soil of vadose zone by technique of Pressure Infiltrometer
en-subtitle=
kn-subtitle=
en-abstract=
kn-abstract=For reducing or bridging gap between small scale laboratory investigations and large scale field investigations, a simple and portable model which is based on real situation and has a compatibility to laboratory core sampling, the pressure infiltrometer technique is introduced for determination of field-saturated hydraulic conductivity. The field -saturated hydraulic conductivity, K(FS), is obtained from measurements of steady flow rates applying constant head as well as falling head principle. The device is also used for field core sampling on which laboratory constant head as well as falling head tests is carried out. The field device is validated through comparison to laboratory core sample experiment and other existing methods. This paper describes first time a versatile field device representing good performance for in situ determination of hydraulic parameters in a short time.
en-copyright=
kn-copyright=

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=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=
en-aut-sei=
en-aut-mei=
kn-aut-name=Mohammad JafarAli
kn-aut-sei=Mohammad Jafar
kn-aut-mei=Ali
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=In-situ test
kn-keyword=In-situ test
en-keyword=Field-saturated Hydraulic conductivity
kn-keyword=Field-saturated Hydraulic conductivity
en-keyword=Matric flux potential
kn-keyword=Matric flux potential
en-keyword=Wetting front
kn-keyword=Wetting front
en-keyword=3D-flow
kn-keyword=3D-flow
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=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=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=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=61
end-page=69
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=Evaluation of closed-form analytical models for predicting unsaturated soil hydraulic properties
en-subtitle=
kn-subtitle=
en-abstract=
kn-abstract=Knowledge of the unsaturated soil hydraulic properties is essential requirement for prediction of seepage flow and contaminant transport through the vadose zone. Unfortunately, these parameters are usually time consuming and expensive to measure in the field and laboratory. At the present condition, there are few data accumulation for Japanese soils. In this paper, van Genuchten's closed-form
expressions are described to estimate unsaturated soil hydraulic properties. To evaluate the adequacy of these expressions, comparisons are performed between observed and calculated unsaturated hydraulic properties for typical Japanese soils.
en-copyright=
kn-copyright=

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=1
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=2
ORCID=

affil-num=1
en-affil=
kn-affil=The Graduate School of Natural Science and Technology

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

start-ver=1.4
cd-journal=joma
no-vol=1
cd-vols=
no-issue=1
article-no=
start-page=115
end-page=119
dt-received=
dt-revised=
dt-accepted=
dt-pub-year=1996
dt-pub=199603
dt-online=
en-article=
kn-article=
en-subject=
kn-subject=
en-title=
kn-title=Parameter Estimation of Unsaturated Soil Hydraulic Properties by Improved Suction Plate Method
en-subtitle=
kn-subtitle=
en-abstract=
kn-abstract=The unsaturated soil hydraulic properties are essential data to predict the seepage behavior in the vadose zone. In this paper, a new experimental methodology of determining unsaturated soil hydraulic properties is proposed. The soil hydraulic properties are assumed to be represented by van Genuchten's closed-form expressions. Unknown parameters of this model are identified by using a optimization techniques. The optimization approach is nonlinear least-squares algorithm in corporating finite element analysis of one-dimensional nonsteady seepage flow. The advantages of the methods are in the possibility of identifying the optimal unsaturated soil hydraulic properties and diminishing experimental time. To evaluate availability of our proposed method, experimental results which are determined by proposed methods and conventional method are compared for decomposed granite soil.
en-copyright=
kn-copyright=

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=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=

affil-num=1
en-affil=
kn-affil=岡山大学

affil-num=2
en-affil=
kn-affil=岡山大学
en-keyword=unsaturated hydraulic properties
kn-keyword=unsaturated hydraulic properties
en-keyword=back analysis
kn-keyword=back analysis
en-keyword=laboratory test
kn-keyword=laboratory test
en-keyword=groundwater
kn-keyword=groundwater
END

start-ver=1.4
cd-journal=joma
no-vol=5
cd-vols=
no-issue=1
article-no=
start-page=71
end-page=79
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=Estimation of Unsaturated hydraulic parameters by In-situ technique
en-subtitle=
kn-subtitle=
en-abstract=
kn-abstract=In-situ determination of fundamental hydraulic parameters like variably saturated hydraulic conductivity (K(FS)) and the matric flux potential (Φ(m)) provides a foundation from which several other unsaturated soil parameters can be estimated, namely the Alpha (α*) parameter. This Alpha parameter is the one of the components of 3D unsaturated flow in vadose zone and its value is the measure of the capillary component of unsaturated flow pattern. Here an in-situ technique, Pressure Infiltrometer is introduced to record the steady flow rate applying a constant positive head on an unsaturated soil surface. The aim of this paper is to check the shape factor of 3D flow geometry and to find out its sensitivity on other unsaturated hydraulic parameters and to find out the influence of Alpha parameters on the results of the in-situ estimation of field-saturated hydraulic conductivity.
en-copyright=
kn-copyright=

en-aut-name=
en-aut-sei=
en-aut-mei=
kn-aut-name=JafarAli Mohammad
kn-aut-sei=Jafar
kn-aut-mei=Ali Mohammad
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=FujiiHiroaki
en-aut-sei=Fujii
en-aut-mei=Hiroaki
kn-aut-name=藤井弘章
kn-aut-sei=藤井
kn-aut-mei=弘章
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=Field-saturated hydraulic conductivity
kn-keyword=Field-saturated hydraulic conductivity
en-keyword=Matric flux potential
kn-keyword=Matric flux potential
en-keyword=Alpha parameter
kn-keyword=Alpha parameter
en-keyword=Shape factor
kn-keyword=Shape factor
en-keyword=In-situ test
kn-keyword=In-situ test
END

start-ver=1.4
cd-journal=joma
no-vol=
cd-vols=
no-issue=
article-no=
start-page=
end-page=
dt-received=
dt-revised=
dt-accepted=
dt-pub-year=1990
dt-pub=19900930
dt-online=
en-article=
kn-article=
en-subject=
kn-subject=
en-title=
kn-title=地盤の浸透特性値の算定方法に関する研究
en-subtitle=
kn-subtitle=
en-abstract=
kn-abstract=
en-copyright=
kn-copyright=

en-aut-name=
en-aut-sei=
en-aut-mei=
kn-aut-name=竹下祐二
kn-aut-sei=竹下
kn-aut-mei=祐二
aut-affil-num=1
ORCID=

affil-num=1
en-affil=
kn-affil=岡山大学
END