| FullText URL | fulltext.pdf |
|---|---|
| Author | Sam, Truong Thao| Somura, Hiroaki| Moroizumi, Toshitsugu| |
| Keywords | hydrological model drought coffee irrigation water-saving technique water allocation |
| Published Date | 2025 |
| Publication Title | Hydrological Research Letters |
| Volume | volume19 |
| Issue | issue2 |
| Publisher | Japan Society of Hydrology and Water Resources |
| Start Page | 94 |
| End Page | 100 |
| ISSN | 1882-3416 |
| Content Type | Journal Article |
| language | English |
| OAI-PMH Set | 岡山大学 |
| Copyright Holders | © The Author(s) 2025. |
| File Version | publisher |
| DOI | 10.3178/hrl.24-00029 |
| Web of Science KeyUT | 001471091300001 |
| Related Url | isVersionOf https://doi.org/10.3178/hrl.24-00029 |
| FullText URL | fulltext.pdf |
|---|---|
| Author | Yengeh, Rohdof Lactem| Somura, Hiroaki| Moroizumi, Toshitsugu| Mori, Yasushi| Maeda, Morihiro| |
| Keywords | dissolved iron seasonal variation dissolved organic matter fulvic acid iron |
| Published Date | 2025 |
| Publication Title | Hydrological Research Letters |
| Volume | volume19 |
| Issue | issue1 |
| Publisher | Japan Society of Hydrology and Water Resources |
| Start Page | 36 |
| End Page | 43 |
| ISSN | 1882-3416 |
| Content Type | Journal Article |
| language | English |
| OAI-PMH Set | 岡山大学 |
| Copyright Holders | © The Author(s) 2025. |
| File Version | publisher |
| DOI | 10.3178/hrl.24-00012 |
| Web of Science KeyUT | 001439689300001 |
| Related Url | isVersionOf https://doi.org/10.3178/hrl.24-00012 |
| FullText URL | fulltext.pdf |
|---|---|
| Author | Zahir, Aliya Mhd| Somura, Hiroaki| Moroizumi, Toshitsugu| |
| Keywords | Water management Remote sensing Irrigation performance Irrigation system Earth observation data Muda Irrigation Scheme |
| Published Date | 2024-12 |
| Publication Title | Agricultural Water Management |
| Volume | volume306 |
| Publisher | Elsevier BV |
| Start Page | 109175 |
| ISSN | 0378-3774 |
| NCID | AA00516315 |
| Content Type | Journal Article |
| language | English |
| OAI-PMH Set | 岡山大学 |
| Copyright Holders | © 2024 The Author(s). |
| File Version | publisher |
| DOI | 10.1016/j.agwat.2024.109175 |
| Web of Science KeyUT | 001363626800001 |
| Related Url | isVersionOf https://doi.org/10.1016/j.agwat.2024.109175 |
| FullText URL | fulltext.pdf |
|---|---|
| Author | Ngoc Quynh Tram, Vo| Somura, Hiroaki| Moroizumi, Toshitsugu| |
| Keywords | hydrological modeling drought indices drought features watershed scale assessment agricultural activities mountainous region |
| Published Date | 2021 |
| Publication Title | Hydrological Research Letters |
| Volume | volume15 |
| Issue | issue3 |
| Publisher | Japan Society of Hydrology and Water Resources |
| Start Page | 77 |
| End Page | 83 |
| ISSN | 1882-3416 |
| Content Type | Journal Article |
| language | English |
| OAI-PMH Set | 岡山大学 |
| Copyright Holders | © The Author(s) 2021. |
| File Version | publisher |
| DOI | 10.3178/hrl.15.77 |
| Related Url | isVersionOf https://doi.org/10.3178/hrl.15.77 |
| FullText URL | fulltext.pdf |
|---|---|
| Author | Mwendwa Wambua, Daniel| Somura, Hiroaki| Moroizumi, Toshitsugu| |
| Keywords | climate change adaptation scenarios downscaling disaggregation temporal |
| Published Date | 2024 |
| Publication Title | Hydrological Research Letters |
| Volume | volume18 |
| Issue | issue4 |
| Publisher | Japan Society of Hydrology and Water Resources |
| Start Page | 87 |
| End Page | 94 |
| ISSN | 1882-3416 |
| Content Type | Journal Article |
| language | English |
| OAI-PMH Set | 岡山大学 |
| Copyright Holders | © The Author(s) 2024. |
| File Version | publisher |
| DOI | 10.3178/hrl.18.87 |
| Web of Science KeyUT | 001333204000001 |
| Related Url | isVersionOf https://doi.org/10.3178/hrl.18.87 |
| FullText URL | fulltext.pdf |
|---|---|
| Author | Zahir, Aliya Mhd| Somura, Hiroaki| Moroizumi, Toshitsugu| |
| Keywords | Google Earth Engine agricultural practices irrigation remote sensing Sentinel-1 |
| Published Date | 2024 |
| Publication Title | Hydrological Research Letters |
| Volume | volume18 |
| Issue | issue1 |
| Publisher | Japan Society of Hydrology and Water Resources (JSHWR) / Japanese Association of Groundwater Hydrology (JAGH) / Japanese Association of Hydrological Sciences (JAHS) / Japanese Society of Physical Hydrology (JSPH) |
| Start Page | 14 |
| End Page | 21 |
| ISSN | 1882-3416 |
| Content Type | Journal Article |
| language | English |
| OAI-PMH Set | 岡山大学 |
| Copyright Holders | © The Author(s) 2024. |
| File Version | publisher |
| DOI | 10.3178/hrl.18.14 |
| Web of Science KeyUT | 001167965700001 |
| Related Url | isVersionOf https://doi.org/10.3178/hrl.18.14 |
| FullText URL | fulltext.pdf |
|---|---|
| Author | Tram, Vo Ngoc Quynh| Somura, Hiroaki| Moroizumi, Toshitsugu| Maeda, Morihiro| |
| Keywords | Land-use policies Land-use changes Agricultural practices Water resources management Hilly areas |
| Published Date | 2022-12 |
| Publication Title | Journal Of Hydrology-Regional Studies |
| Volume | volume44 |
| Publisher | Elsevier |
| Start Page | 101225 |
| ISSN | 2214-5818 |
| Content Type | Journal Article |
| language | English |
| OAI-PMH Set | 岡山大学 |
| Copyright Holders | © 2022 The Author(s). |
| File Version | publisher |
| DOI | 10.1016/j.ejrh.2022.101225 |
| Web of Science KeyUT | 000873972800001 |
| Related Url | isVersionOf https://doi.org/10.1016/j.ejrh.2022.101225 |
| FullText URL | fulltext.pdf |
|---|---|
| Author | Tram, Vo Ngoc Quynh| Somura, Hiroaki| Moroizumi, Toshitsugu| |
| Keywords | land-use conversion afforestation deforestation agricultural expansion urbanization mountainous areas watershed modeling |
| Published Date | 2021-02-27 |
| Publication Title | WATER |
| Volume | volume13 |
| Issue | issue5 |
| Publisher | MDPI |
| Start Page | 627 |
| ISSN | 2073-4441 |
| Content Type | Journal Article |
| language | English |
| OAI-PMH Set | 岡山大学 |
| Copyright Holders | © 2021 by the authors. |
| File Version | publisher |
| DOI | 10.3390/w13050627 |
| NAID | 120007019118 |
| Web of Science KeyUT | 000628578800001 |
| Related Url | isVersionOf https://doi.org/10.3390/w13050627 |
| Title Alternative | Mitigation Effect of Thermal Environment on the Asphalt by Sprayed Water |
|---|---|
| FullText URL | fest_026_007_010.pdf |
| Author | MOROIZUMI, Toshitsugu| ITO, Naoya| MIURA, Takeshi| |
| Abstract | In this study, water was sprinkled on the asphalt surface during the hottest hours of the day using a sprinkler, and the effect was experimentally verified. An air temperature, a humidity, a ground surface temperature, and a globe temperature which is radiant heat from the ground were measured, and using these measurements, WBGT (Wet-Bulb Globe Temperature), which is an index of thermal stress on the human body, was calculated. In this way, we investigated not only the climate mitigation effect but also the mitigation effect of the thermal environment felt by the human body. As a result, the following points were clarified in this study: 1) During sprinkling, the air temperature, the black globe temperature, and the WBGT were lower in the sprinkled area than in the controlled area, and the wet-bulb temperature hardly changed. 2) Focusing on the amount of change after watering compared to before watering, the air temperature, the globe temperature, and the WBGT decreased, and the wet-bulb temperature hardly changed. 3) In the sprinkled area, when the WBGT value just before watering is higher than that of the strict caution (WBGT is 28°C or higher), it drops to a level one rank lower, and when the WBGT value just before watering is warning (WBGT value is 25°C or higher), it was almost no change. |
| Keywords | WBGT Air temperature Globe Temperature Thermal environment Sprayed water |
| Publication Title | 岡山大学環境理工学部研究報告 |
| Published Date | 2021-03 |
| Volume | volume26 |
| Issue | issue1 |
| Start Page | 7 |
| End Page | 10 |
| ISSN | 13419099 |
| language | Japanese |
| File Version | publisher |
| Title Alternative | Estimation of actual evapotranspiration in 3 river basins in Okayama prefecture - Comparison of Morton method and modified Brutsaert & Stricker method - |
|---|---|
| FullText URL | fest_026_001_005.pdf |
| Author | MOROIZUMI, Toshitsugu| MIURA, Takeshi| |
| Abstract | In the study, the actual evaporation was estimated in the Asahi River, the Takahashi River, and the Yoshii River basins in Okayama prefecture for four years from January 1999 to December 2002. The Morton method and the modified Brutsaert and Stricker (B & S) method were applied to the three river basins to estimate the actual evapotranspiration and compare the two methods. As a result, the actual evapotranspiration by the Morton method was all almost equal to that by the Penman’s potential evapotranspiration, and the evapotranspiration was overestimated rather than the actual evapotranspiration. The actual evapotranspiration by the modified B & S method was below the Penman’s potential evapotranspiration throughout the year, and the total annual amount was about 80% of the potential evapotranspiration. In addition, the modified B & S method showed the general tendency that the actual evapotranspiration was lower in urban area than in the hilly and mountainous areas. |
| Keywords | Complementary relationship Actual evapotranspiration Potential evapotranspiration |
| Publication Title | 岡山大学環境理工学部研究報告 |
| Published Date | 2021-03 |
| Volume | volume26 |
| Issue | issue1 |
| Start Page | 1 |
| End Page | 5 |
| ISSN | 13419099 |
| language | Japanese |
| File Version | publisher |
| JaLCDOI | 10.18926/fest/54862 |
|---|---|
| Title Alternative | Method for predicting minimum air temperature in the next morning using local meteorological observation data - Improvement on minimum air temperature forecasting system utilizing the Internet - |
| FullText URL | fest_022_055_059.pdf |
| Author | Ueda, Yu| Mishima, Takuya| Miura, Takeshi| Moroizumi, Toshitsugu| |
| Abstract | We have developed a minimum air temperature forecasting system using local meteorological observation data in order to prevent or mitigate the frost damage. In this paper, the correlation between the meteorological factors and the decrease in air temperature during the night was shown. Then minimum air temperature was predicted by the multiple regression equation that uses air temperature and humidity at 18:00 as explanatory variables. As the result, the root mean square error (RMSE) was 2.8°C. When the difference of air temperature between 17:00 and 18:00 was used for the prediction instead of humidity, the RMSE was 3.5°C. Next, the prediction was carried out only in clear nights, then the equation that use air temperature and humidity at 18:00 showed that the RMSE was 1.3°C. Although the predictive accuracy of the equations for clear nights is low on cloudy or rainy nights, we can forecast safely on frosty nights by using those equations in combination with the equations for all nights. |
| Keywords | Minimum air temperature prediction frost damage IT multiple regression analysis |
| Publication Title | 岡山大学環境理工学部研究報告 |
| Published Date | 2017-03 |
| Volume | volume22 |
| Issue | issue1 |
| Start Page | 55 |
| End Page | 59 |
| ISSN | 2187-6940 |
| language | Japanese |
| File Version | publisher |
| NAID | 120005997443 |
| JaLCDOI | 10.18926/fest/53219 |
|---|---|
| Title Alternative | Building of minimum air temperature forecast system using the Internet -Design of the forecast website- |
| FullText URL | fest_020_035_040.pdf |
| Author | Mishima, Takuya| Miura, Takeshi| Moroizumi, Toshitsugu| |
| Abstract | The purpose of this study is to build a forecast system for predicting at minimum air temperature in the next morning from the meteorological data, such as air temperature, humidity, and the amount of solar radiation, in a field in the evening on the previous day. The meteorological data are sent to a relay server, and then, transferred to a PC in our laboratory of Okayama University by executing the computer program to import the data which are used to calculate the predicted values of minimum air temperature. The predicted minimum air temperatures are released for the farmers on the website in the server of Okayama University. The website is also created by our laboratory. As a result, the predicted minimum air temperatures agreed with the measured ones. |
| Keywords | Minimum air temperature prediction internet frozen disaster |
| Publication Title | 岡山大学環境理工学部研究報告 |
| Published Date | 2015-03 |
| Volume | volume20 |
| Issue | issue1 |
| Start Page | 35 |
| End Page | 40 |
| ISSN | 2187-6940 |
| language | Japanese |
| File Version | publisher |
| NAID | 120005572534 |
| Author | MOROIZUMI, Toshitsugu| ITO, Naoya| KOSKIAHO, Jari| TATTARI, Sirkka| |
|---|---|
| Published Date | 2014-06 |
| Publication Title | SYKE-OU Project Report |
| Content Type | Research Paper |
| JaLCDOI | 10.18926/fest/44792 |
|---|---|
| Title Alternative | Improvement of complementary relationship-based evapotranspiration model |
| FullText URL | fest_016_035_039.pdf |
| Author | Nakamichi, Takeshi| Moroizumi, Toshitsugu| Miura, Takeshi| |
| Abstract | Advection-Aridity(AA) model can calculate actual evapotranspiration by using only meteorological data. However, comparing the model with Penman equation showed that AA model doesn’t properly evaluate evapotranspiration from urban moisture area. In urban area, Actual evaporation from water calculated by AA model(E) are much less than that by Penman equation(Epo). Multiple regression analysis using estimation results indicates that the difference between the models is due to the difference of the sensitivity to vapor pressure deficit between the models. To improve this problem, modification coefficient k, defined as k=a･albedo+b, is suggested. Regression coefficients a, b are determined as satisfying k=Epo/E for water and k=1 for urban surface. By using this coefficient k, evaporation from water is nearly equal to value estimated by Penman equation, while evaporation from urban surface is changeless. |
| Keywords | Complementary relationship Actual evapotranspiration Potential evapotranspiration Water budget |
| Publication Title | 岡山大学環境理工学部研究報告 |
| Published Date | 2011-03-18 |
| Volume | volume16 |
| Issue | issue1 |
| Start Page | 35 |
| End Page | 39 |
| ISSN | 2185-3347 |
| language | Japanese |
| File Version | publisher |
| NAID | 120002949472 |
| Author | Moroizumi, Toshitsugu| Kusuyama, Tomoyo| Miura, Takeshi| |
|---|---|
| Published Date | 2009-12 |
| Publication Title | 環境制御 |
| Volume | volume31 |
| Content Type | Departmental Bulletin Paper |
| Author | Moroizumi, Toshitsugu| |
|---|---|
| Published Date | 2006-12 |
| Publication Title | 環境制御 |
| Volume | volume28 |
| Content Type | Others |
| Author | Moroizumi, Toshitsugu| Sasaki, Yumi| Miura, Takeshi| |
|---|---|
| Published Date | 2008-12 |
| Publication Title | 環境制御 |
| Volume | volume30 |
| Content Type | Journal Article |
| Author | 吉崎 文人| 黒田 訓宏| Miura, Takeshi| Moroizumi, Toshitsugu| |
|---|---|
| Published Date | 2004-07-01 |
| Publication Title | 岡山大学農学部センター報告 |
| Volume | volume26 |
| Content Type | Departmental Bulletin Paper |
| JaLCDOI | 10.18926/fest/11537 |
|---|---|
| Title Alternative | Long-term Change Trend of Climate at Aomori City |
| FullText URL | 006_081_084.pdf |
| Author | Moroizumi, Toshitsugu| Sato, Yuichi| Sato, Koichi| Miura, Takeshi| |
| Abstract | Characteristics of long-term change for air temperature, precipitation and snowfall-depth at Aomori city were analyzed with data during the 111 years, from 1886 to 1996. The typical results were as follows: (1) The increasing rate of the annual mean air temperature was 1.07℃/111 year. (2) The increasing rate of the monthly minimum air temperature was larger than that of the monthly maximum air temperature. (3) The increasing rate of the monthly air temperature was large from winter to spring, however, was not so from summer to autumn. (4) The decreasing rate of annual precipitation was 0.187 mm/year. (5) The 5-year moving average of annual snowfall-depth might indicate the existence of about 10-year period. |
| Keywords | Air temperature precipitation snowfall-depth long-term change Aomori city |
| Publication Title | 岡山大学環境理工学部研究報告 |
| Published Date | 2001-02-28 |
| Volume | volume6 |
| Issue | issue1 |
| Start Page | 81 |
| End Page | 84 |
| ISSN | 1341-9099 |
| language | Japanese |
| File Version | publisher |
| NAID | 120002313378 |
| JaLCDOI | 10.18926/fest/11536 |
|---|---|
| Title Alternative | Long-term Trend of Rainfall at Tsudaka Farm of Okayama University |
| FullText URL | 007_107_111.pdf |
| Author | Moroizumi, Toshitsugu| Yomota, Atsushi| Miura, Takeshi| |
| Abstract | Characteristics of long-term change in rainfall at Tsudaka Farm of Okayama University were analyzed with data during the 20 years, from 1979 to 1998. The typical results were as follows: (1) The average of annual rainfall was 1203 mm at average, 1726 mm at maximum, and 666 mm at minimum. (2) The decreasing rate of the annual rainfall was 5.37 mm/year. (3) Trend of rainfall intensity in each rainfall duration showed an increase of which rate were 0.005~0.256 mm/h/year, contrary to the annual trend. (4) Rainfall intensities in n-years probability were estimated using the maximum rainfall intensity for each rainfall duration. |
| Keywords | Rainfall Rainfall intensity Rainfall duration Talbot formula Long-term trend Tsudaka Farm of Okayama University |
| Publication Title | 岡山大学環境理工学部研究報告 |
| Published Date | 2002-03-22 |
| Volume | volume7 |
| Issue | issue1 |
| Start Page | 107 |
| End Page | 111 |
| ISSN | 1341-9099 |
| language | Japanese |
| File Version | publisher |
| NAID | 120002313813 |
