start-ver=1.4
cd-journal=joma
no-vol=21
cd-vols=
no-issue=
article-no=
start-page=100624
end-page=
dt-received=
dt-revised=
dt-accepted=
dt-pub-year=2026
dt-pub=202603
dt-online=
en-article=
kn-article=
en-subject=
kn-subject=
en-title=
kn-title=Assessing water resources availability and crop performance under climate change in Kenya's Bura irrigation scheme using SWAT and AquaCrop
en-subtitle=
kn-subtitle=
en-abstract=
kn-abstract=The current study focused on Tana River Basin in Kenya, home to the Bura irrigation scheme (BIS). The BIS faces water supply shortages during critical months of crop development. This study aimed to evaluate the available water resources and crop performance using the Soil and Water Assessment Tool (SWAT) and AquaCrop, respectively, under historical and future shared socioeconomic pathways (SSPs) at the BIS. SWAT estimated the total available flows (TAF) at the BIS intake, whereas AquaCrop estimated crop water requirements (CWR), yields, and water productivity (Wpet) of rice and maize at various carbon (IV) oxide (CO2) levels. The study suggested that the TAF will remain relatively low during the early critical crop development stages in the main cropping season, August-October. Maize yields remained steady over the two cropping seasons under both constant and elevated CO2 levels in the historical and future periods, as opposed to those of rice. Elevated CO2 levels led to diminishing CWR. Moreover, rice showed a stronger response to elevated CO2 than maize. As a result, maize which is less affected by variations in CO2 and temperatures and has less crop water requirements will be better suited than rice for cultivation in the BIS under climate change. To ensure a sustainable water supply in the scheme, the government should increase rainwater harvesting during periods of high TAF. Moreover, there should be a focus on introducing crops that are tolerant to water and temperature stresses and that can reap the most from the elevated CO2 levels.
en-copyright=
kn-copyright=

en-aut-name=WambuaDaniel Mwendwa
en-aut-sei=Wambua
en-aut-mei=Daniel Mwendwa
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=1
ORCID=

en-aut-name=SomuraHiroaki
en-aut-sei=Somura
en-aut-mei=Hiroaki
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=2
ORCID=

en-aut-name=MoroizumiToshitsugu
en-aut-sei=Moroizumi
en-aut-mei=Toshitsugu
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=3
ORCID=

en-aut-name=MaedaMorihiro
en-aut-sei=Maeda
en-aut-mei=Morihiro
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=4
ORCID=

affil-num=1
en-affil=Graduate School of Environmental and Life Science, Okayama University
kn-affil=

affil-num=2
en-affil=Graduate School of Environmental and Life Science, Okayama University
kn-affil=

affil-num=3
en-affil=Graduate School of Environmental and Life Science, Okayama University
kn-affil=

affil-num=4
en-affil=Graduate School of Environmental and Life Science, Okayama University
kn-affil=
en-keyword=Climate change
kn-keyword=Climate change
en-keyword=Shared socioeconomic pathways
kn-keyword=Shared socioeconomic pathways
en-keyword=Sustainable water management
kn-keyword=Sustainable water management
en-keyword=Temperature stress days
kn-keyword=Temperature stress days
en-keyword=Water stress days
kn-keyword=Water stress days
en-keyword=Water productivity
kn-keyword=Water productivity
en-keyword=Yields
kn-keyword=Yields
END

start-ver=1.4
cd-journal=joma
no-vol=177
cd-vols=
no-issue=
article-no=
start-page=113652
end-page=
dt-received=
dt-revised=
dt-accepted=
dt-pub-year=2025
dt-pub=202508
dt-online=
en-article=
kn-article=
en-subject=
kn-subject=
en-title=
kn-title=Long-term effects of forest growth dynamics and climate change on groundwater recharge and evapotranspiration in a steep catchment of western Japan
en-subtitle=
kn-subtitle=
en-abstract=
kn-abstract=Growing water demand for human and environmental needs has led to increased reliance on groundwater resources. However, groundwater is a finite resource, and its sustainability is closely linked to recharge processes, which are influenced by forest growth dynamics as well as climate change. Evapotranspiration, largely driven by vegetation cover and climatic conditions, represents a major component of terrestrial water loss that can reduce groundwater recharge. In this study, forest growth trends, reflecting the complete developmental stages from juvenile to post-maturity of a representative species, were reconstructed using remote sensing data, forest inventories, and field studies, and incorporated into the SWAT model to evaluate their impacts on groundwater recharge and evapotranspiration as indicators of forest hydrological function and ecosystem health. The model’s vegetation growth simulation was enhanced and uncertainty reduced by dynamically updating it with MODIS-derived leaf area index (LAI) at 5-year intervals. Groundwater recharge estimates were further improved through multi-variable calibration using Penman–Monteith–Leuning evapotranspiration (V2) and streamflow data to ensure water budget closure. Results showed that evergreen conifer growth from planting to maturity significantly reduced groundwater recharge (–4.7 mm/year) and increased evapotranspiration (+7.6 mm/year). In contrast, natural and mature deciduous broadleaf forests showed more stable recharge and evapotranspiration trends. Rising temperatures were identified as a key climatic driver of reduced recharge and increased evapotranspiration, reflecting broader global warming impacts. This study demonstrates that forest growth dynamics, especially during the critical transition from planting to maturity, alongside climate change, play a crucial role in shaping the catchment’s water balance and offer valuable insights for sustainable groundwater management, particularly in transitional forest ecosystems.
en-copyright=
kn-copyright=

en-aut-name=GuyoRendilicha Halake
en-aut-sei=Guyo
en-aut-mei=Rendilicha Halake
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=1
ORCID=

en-aut-name=WangKunyang
en-aut-sei=Wang
en-aut-mei=Kunyang
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=2
ORCID=

en-aut-name=OnoderaShin-ichi
en-aut-sei=Onodera
en-aut-mei=Shin-ichi
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=3
ORCID=

en-aut-name=SaitoMitsuyo
en-aut-sei=Saito
en-aut-mei=Mitsuyo
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=4
ORCID=

en-aut-name=MoroizumiToshitsugu
en-aut-sei=Moroizumi
en-aut-mei=Toshitsugu
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=5
ORCID=

affil-num=1
en-affil= Graduate School of Environmental and Life Science, Okayama University
kn-affil=

affil-num=2
en-affil=Graduate School of Advanced Science and Engineering, Hiroshima University
kn-affil=

affil-num=3
en-affil=Graduate School of Advanced Science and Engineering, Hiroshima University
kn-affil=

affil-num=4
en-affil=Graduate School of Advanced Science and Engineering, Hiroshima University
kn-affil=

affil-num=5
en-affil= Graduate School of Environmental and Life Science, Okayama University
kn-affil=
en-keyword=Forest growth
kn-keyword=Forest growth
en-keyword=SWAT
kn-keyword=SWAT
en-keyword=Groundwater recharge
kn-keyword=Groundwater recharge
en-keyword=Evapotranspiration
kn-keyword=Evapotranspiration
en-keyword=MODIS LAI
kn-keyword=MODIS LAI
en-keyword=PML_V2
kn-keyword=PML_V2
en-keyword=Climate change
kn-keyword=Climate change
END

start-ver=1.4
cd-journal=joma
no-vol=19
cd-vols=
no-issue=4
article-no=
start-page=223
end-page=230
dt-received=
dt-revised=
dt-accepted=
dt-pub-year=2025
dt-pub=2025
dt-online=
en-article=
kn-article=
en-subject=
kn-subject=
en-title=
kn-title=Unique drought tendency of an understudied region in the Mekong Delta, Vietnam
en-subtitle=
kn-subtitle=
en-abstract=
kn-abstract=Water resource vulnerability due to uneven precipitation and water allocations is a significant issue in many regions of the world, including the Mekong Delta. Although numerous studies have already evaluated drought tendencies in many parts of the Mekong Delta, some areas have been excluded. This study targeted these excluded areas, including one inland, one coastal area, and two islands, which are defined as “understudied regions.” The meteorological drought intensity, frequency, and duration in the study areas in the Mekong Delta were evaluated using different time scales of the Standardized Precipitation Index (SPI) between 1994–2020. Unique contrasts in drought features were found between the study areas, indicating that severe drought events occupied the highest percentages inland from 2011 onward, while the most extreme drought events occurred in the coastal areas. Furthermore, trends in drought intensity, tendency, frequency, and duration were identified within the same delta region, demonstrating that combining SPI with other indicators can detect drought patterns in the Mekong Delta. These findings emphasize the importance of comprehensive evaluation of drought tendencies, including in understudied regions, for a better understanding of the features and future of water resources management.
en-copyright=
kn-copyright=

en-aut-name=TsuhaYu
en-aut-sei=Tsuha
en-aut-mei=Yu
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=1
ORCID=

en-aut-name=SomuraHiroaki
en-aut-sei=Somura
en-aut-mei=Hiroaki
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=2
ORCID=

en-aut-name=TramVo Ngoc Quynh
en-aut-sei=Tram
en-aut-mei=Vo Ngoc Quynh
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=3
ORCID=

en-aut-name=MoroizumiToshitsugu
en-aut-sei=Moroizumi
en-aut-mei=Toshitsugu
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=4
ORCID=

affil-num=1
en-affil=Graduate School of Environmental and Life Science, Okayama University
kn-affil=

affil-num=2
en-affil=Graduate School of Environmental and Life Science, Okayama University
kn-affil=

affil-num=3
en-affil=Research Center for Climate Change, Nong Lam University
kn-affil=

affil-num=4
en-affil=Graduate School of Environmental and Life Science, Okayama University
kn-affil=
en-keyword=drought index
kn-keyword=drought index
en-keyword=drought trend
kn-keyword=drought trend
en-keyword=water resource variability
kn-keyword=water resource variability
en-keyword=inland area
kn-keyword=inland area
en-keyword=island area
kn-keyword=island area
END

start-ver=1.4
cd-journal=joma
no-vol=19
cd-vols=
no-issue=2
article-no=
start-page=94
end-page=100
dt-received=
dt-revised=
dt-accepted=
dt-pub-year=2025
dt-pub=2025
dt-online=
en-article=
kn-article=
en-subject=
kn-subject=
en-title=
kn-title=Effects of different management approaches on unmet water demand in coffee-producing areas during wet and dry years: a case study of the Srepok River Watershed, Vietnam
en-subtitle=
kn-subtitle=
en-abstract=
kn-abstract=The primary cause of conflicts over water allocation is growing demand and limited supply, which has become an increasingly serious issue in many watersheds. To alleviate water disputes, effective management strategies can be employed, particularly in the context of intensifying agricultural production and unpredictable changes in weather. In this study, two models, SWAT and WEAP, and the modified surface water supply index (MSWSI) were utilized to evaluate water allocation in the Srepok River Watershed (SRW), considering the prioritization of demand and various irrigation methods, during both wet and dry years. The crop irrigation was chosen to be the main focus in relation to the unmet water demand (UWD). The results indicated that coffee was the primary cause of UWD in the middle of the watershed during the second half of the dry season, and annual crops (AC) were the secondary cause. This research further elucidated that while prioritizing demand had an insignificant impact, transitioning from hose irrigation to sprinkler irrigation could be remarkably effective in mitigating the issues of UWD in coffee crops during both wet and dry years.
en-copyright=
kn-copyright=

en-aut-name=SamTruong Thao
en-aut-sei=Sam
en-aut-mei=Truong Thao
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=1
ORCID=

en-aut-name=SomuraHiroaki
en-aut-sei=Somura
en-aut-mei=Hiroaki
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=2
ORCID=

en-aut-name=MoroizumiToshitsugu
en-aut-sei=Moroizumi
en-aut-mei=Toshitsugu
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=3
ORCID=

affil-num=1
en-affil=Graduate School of Environmental and Life Science, Okayama University
kn-affil=

affil-num=2
en-affil=Graduate School of Environmental and Life Science, Okayama University
kn-affil=

affil-num=3
en-affil=Graduate School of Environmental and Life Science, Okayama University
kn-affil=
en-keyword=hydrological model
kn-keyword=hydrological model
en-keyword=drought
kn-keyword=drought
en-keyword=coffee irrigation
kn-keyword=coffee irrigation
en-keyword=water-saving technique
kn-keyword=water-saving technique
en-keyword=water allocation
kn-keyword=water allocation
END

start-ver=1.4
cd-journal=joma
no-vol=19
cd-vols=
no-issue=1
article-no=
start-page=36
end-page=43
dt-received=
dt-revised=
dt-accepted=
dt-pub-year=2025
dt-pub=2025
dt-online=
en-article=
kn-article=
en-subject=
kn-subject=
en-title=
kn-title=Evaluation of the temporal behavior of fulvic acid iron in Asahi River, Okayama, Japan
en-subtitle=
kn-subtitle=
en-abstract=
kn-abstract=Iron is essential for biogeochemical processes in aquatic ecosystems, but its riverine concentration can be affected by environmental conditions. This study assessed weekly fulvic acid iron (FAFe) concentration at a single sampling site in Asahi River from 2022–2023 to explore the differences in the temporal scales. The objectives of this study were to evaluate the effects of physicochemical properties of the river on the concentration of FAFe, analyze the concentration of FAFe in spring, summer, autumn and winter, and assess the relationship between FAFe concentration and land use types of the watershed. The results indicated that physicochemical parameters, such as pH and surface water temperature (SWT) seemed to influence FAFe concentration (p < 0.05). Hydrological dynamics influenced FAFe concentration and transport, revealing an increasing trend during spring (p < 0.001) and summer (p = 0.05), with non-significant trends during autumn and winter (p > 0.05). FAFe exhibited a strong positive correlation with total organic carbon (TOC) (p < 0.001). Upland fields significantly influenced FAFe concentration (p < 0.01) through runoff with abundant NO3– and PO43– into the river. Thus, FAFe concentration in Asahi River was influenced by pH, SWT, TOC, hydrological regime, and agricultural runoff.
en-copyright=
kn-copyright=

en-aut-name=YengehRohdof Lactem
en-aut-sei=Yengeh
en-aut-mei=Rohdof Lactem
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=1
ORCID=

en-aut-name=SomuraHiroaki
en-aut-sei=Somura
en-aut-mei=Hiroaki
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=2
ORCID=

en-aut-name=MoroizumiToshitsugu
en-aut-sei=Moroizumi
en-aut-mei=Toshitsugu
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=3
ORCID=

en-aut-name=MoriYasushi
en-aut-sei=Mori
en-aut-mei=Yasushi
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=4
ORCID=

en-aut-name=MaedaMorihiro
en-aut-sei=Maeda
en-aut-mei=Morihiro
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=5
ORCID=

affil-num=1
en-affil=Graduate School of Environmental and Life Science, Okayama University
kn-affil=

affil-num=2
en-affil=Graduate School of Environmental and Life Science, Okayama University
kn-affil=

affil-num=3
en-affil=Graduate School of Environmental and Life Science, Okayama University
kn-affil=

affil-num=4
en-affil=Graduate School of Environmental and Life Science, Okayama University
kn-affil=

affil-num=5
en-affil=Graduate School of Environmental and Life Science, Okayama University
kn-affil=
en-keyword=dissolved iron
kn-keyword=dissolved iron
en-keyword=seasonal variation
kn-keyword=seasonal variation
en-keyword=dissolved organic matter
kn-keyword=dissolved organic matter
en-keyword=fulvic acid iron
kn-keyword=fulvic acid iron
END

start-ver=1.4
cd-journal=joma
no-vol=306
cd-vols=
no-issue=
article-no=
start-page=109175
end-page=
dt-received=
dt-revised=
dt-accepted=
dt-pub-year=2024
dt-pub=202412
dt-online=
en-article=
kn-article=
en-subject=
kn-subject=
en-title=
kn-title=Regional-scale evaluation of tertiary irrigation system in Muda Irrigation Scheme from space
en-subtitle=
kn-subtitle=
en-abstract=
kn-abstract=A tertiary irrigation system is essential for efficient water management in large-scale irrigation scheme and requires regular evaluation to understand their effectiveness. The current water balance method for tertiary irrigation system evaluation requires extensive data, making continuous monitoring over vast areas unfeasible. A better approach using geospatial data from the Google Earth Engine (GEE) is introduces to evaluate the efficiency of tertiary irrigation systems on a regional scale, aiding water management strategies. This study aims to (1) define the rice cultivation boundary for accurate data collection and (2) quantitatively evaluate irrigation system performance using specific indicators. Remote sensing evapotranspiration (RS-ET) and yield derived from Normalized Difference Vegetation Index (NDVI) were collected within rice cultivation boundary across 60 irrigation blocks, including 14 blocks equipped with tertiary irrigation system in Region II of the Muda Irrigation Scheme. Three irrigation system performance indicators (equity, adequacy, and water productivity) were used as a key metric in over four rice-growing seasons to evaluate tertiary irrigation system. Results reveal that tertiary irrigation system performance varies with the current three-phase water management strategy. Equity performance was highest during the off-season, particularly in phase 1 (2–8 %). Adequacy was moderate across all phases and seasons (median: 0.6–0.67), while water productivity showed consistent strength in phases 1 and 3, with fluctuations in phase 2, across seasons. This study underscores the cost-effectiveness and efficiency of using geospatial data from space for continuous regional-scale monitoring, highlighting areas for improvement in the current water management strategy.
en-copyright=
kn-copyright=

en-aut-name=ZahirAliya Mhd
en-aut-sei=Zahir
en-aut-mei=Aliya Mhd
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=1
ORCID=

en-aut-name=SomuraHiroaki
en-aut-sei=Somura
en-aut-mei=Hiroaki
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=2
ORCID=

en-aut-name=MoroizumiToshitsugu
en-aut-sei=Moroizumi
en-aut-mei=Toshitsugu
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=3
ORCID=

affil-num=1
en-affil=Graduate School of Environmental and Life Science, Okayama University
kn-affil=

affil-num=2
en-affil=Graduate School of Environmental and Life Science, Okayama University
kn-affil=

affil-num=3
en-affil=Graduate School of Environmental and Life Science, Okayama University
kn-affil=
en-keyword=Water management
kn-keyword=Water management
en-keyword=Remote sensing
kn-keyword=Remote sensing
en-keyword=Irrigation performance
kn-keyword=Irrigation performance
en-keyword=Irrigation system
kn-keyword=Irrigation system
en-keyword=Earth observation data
kn-keyword=Earth observation data
en-keyword=Muda Irrigation Scheme
kn-keyword=Muda Irrigation Scheme
END

start-ver=1.4
cd-journal=joma
no-vol=15
cd-vols=
no-issue=3
article-no=
start-page=77
end-page=83
dt-received=
dt-revised=
dt-accepted=
dt-pub-year=2021
dt-pub=2021
dt-online=
en-article=
kn-article=
en-subject=
kn-subject=
en-title=
kn-title=Evaluation of drought features in the Dakbla watershed, Central Highlands of Vietnam
en-subtitle=
kn-subtitle=
en-abstract=
kn-abstract=The drought impacts in the Dakbla watershed were assessed based on a combination of hydrological modeling and drought indices. Three drought indices, the Standardized Precipitation Index (SPI), Standardized Soil Moisture Index (SSI), and Streamflow Drought Index (SDI) were utilized to evaluate the drought features of meteo-hydrology and agriculture. The results indicated that these indices are well adapted to the local conditions, especially the 12-month time scale. Evaluations of drought features on the watershed scale could provide more specific information regarding drought risk than regional-scale/district-level assessments, because a watershed is a hydrologically fundamental unit to consider water resources management. Additionally, evaluations of drought impacts using the SSI showed longer and higher trends than those using the SPI and SDI in terms of drought duration and frequency. Considering the spatial distribution of drought frequency, the areas predominated by agricultural land in the target watershed had higher drought risk. Thus, assessment of agricultural droughts along with meteo-hydrological droughts is extremely important to support realistic local drought management strategies by considering water availability, water balance, and soil characteristics, especially in specific agricultural areas.
en-copyright=
kn-copyright=

en-aut-name=Ngoc Quynh TramVo
en-aut-sei=Ngoc Quynh Tram
en-aut-mei=Vo
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=1
ORCID=

en-aut-name=SomuraHiroaki
en-aut-sei=Somura
en-aut-mei=Hiroaki
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=2
ORCID=

en-aut-name=MoroizumiToshitsugu
en-aut-sei=Moroizumi
en-aut-mei=Toshitsugu
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=3
ORCID=

affil-num=1
en-affil=Graduate School of Environmental and Life Science, Okayama University
kn-affil=

affil-num=2
en-affil=Graduate School of Environmental and Life Science, Okayama University
kn-affil=

affil-num=3
en-affil=Graduate School of Environmental and Life Science, Okayama University
kn-affil=
en-keyword=hydrological modeling
kn-keyword=hydrological modeling
en-keyword=drought indices
kn-keyword=drought indices
en-keyword=drought features
kn-keyword=drought features
en-keyword=watershed scale assessment
kn-keyword=watershed scale assessment
en-keyword=agricultural activities
kn-keyword=agricultural activities
en-keyword=mountainous region
kn-keyword=mountainous region
END

start-ver=1.4
cd-journal=joma
no-vol=18
cd-vols=
no-issue=4
article-no=
start-page=87
end-page=94
dt-received=
dt-revised=
dt-accepted=
dt-pub-year=2024
dt-pub=2024
dt-online=
en-article=
kn-article=
en-subject=
kn-subject=
en-title=
kn-title=Evaluation and selection of a set of CMIP6 GCMs for water resource modeling in the poorly gauged complex terrain of the Tana River basin in Kenya
en-subtitle=
kn-subtitle=
en-abstract=
kn-abstract=The Tana River basin is among the least monitored in terms of meteorological data in Kenya. The Kenya Meteorological Department (KMD) provided data on a ten-day timescale, which is not adequate for water resource evaluation. To bridge this data gap, there is a growing need to leverage General Circulation Models (GCMs) and global datasets to assess current and future water resources in this basin. This study focused on evaluating the performance of 19 CMIP6 GCMs concerning precipitation (pr), maximum temperature (tasmax), and minimum temperature (tasmin) for the complex terrain of the Tana River basin. This involved a rigorous process of disaggregating the data provided by the KMD into a daily timescale for downscaling. The GCMs’ historical output was prepared using the Climate Data Operator (CDO) in Cygwin. The Kling Gupta Efficiency (KGE) was computed for each variable at three stations: Nyeri (upstream), Kitui (midstream), and Bura (downstream). The KGE results were validated using Taylor statistics. Five GCMs, CMCC-ESM2, MPI-ESM1-2-HR, ACCESS-CM2, NorESM2-MM, and GFDL-ESM4, performed best with a multivariable Multi-station KGE statistic of 0.455–0.511. The outputs from these selected GCMs were subsequently downscaled for later use in assessing the water resources and crop water demand in the basin.
en-copyright=
kn-copyright=

en-aut-name=Mwendwa WambuaDaniel
en-aut-sei=Mwendwa Wambua
en-aut-mei=Daniel
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=1
ORCID=

en-aut-name=SomuraHiroaki
en-aut-sei=Somura
en-aut-mei=Hiroaki
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=2
ORCID=

en-aut-name=MoroizumiToshitsugu
en-aut-sei=Moroizumi
en-aut-mei=Toshitsugu
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=3
ORCID=

affil-num=1
en-affil=Graduate School of Environmental and Life Science, Okayama University
kn-affil=

affil-num=2
en-affil=Graduate School of Environmental and Life Science, Okayama University
kn-affil=

affil-num=3
en-affil=Graduate School of Environmental and Life Science, Okayama University
kn-affil=
en-keyword=climate change
kn-keyword=climate change
en-keyword=adaptation
kn-keyword=adaptation
en-keyword=scenarios
kn-keyword=scenarios
en-keyword=downscaling
kn-keyword=downscaling
en-keyword=disaggregation
kn-keyword=disaggregation
en-keyword=temporal
kn-keyword=temporal
END

start-ver=1.4
cd-journal=joma
no-vol=18
cd-vols=
no-issue=1
article-no=
start-page=14
end-page=21
dt-received=
dt-revised=
dt-accepted=
dt-pub-year=2024
dt-pub=2024
dt-online=
en-article=
kn-article=
en-subject=
kn-subject=
en-title=
kn-title=Efficient agricultural monitoring: a methodology for assessing individual farmer adherence to rice-planting schedule for tertiary irrigation system under the Muda Irrigation Scheme using Earth observation datasets
en-subtitle=
kn-subtitle=
en-abstract=
kn-abstract=The tertiary irrigation system (TIS) was designed for the Muda Irrigation Scheme (MIS) to distribute irrigation water to farmers' fields to ensure the reliability of water supply for cultivating rice paddies twice a year. Variability in farming practices, influenced by farmer autonomy along the tertiary canal adds complexity and uncertainty to adherence monitoring. Traditional on -site data collection methods are limited in scope and efficiency, whereas Earth observation (EO) enables continuous monitoring. In this study, we introduced a methodology that uses EO datasets to monitor individual field adherence to rice -planting schedules under TIS. These tools improve the monitoring of rice -planting schedule adherence by identifying non -adherent fields for further countermeasures. This study highlights the potential use of EO datasets and advanced data processing techniques for efficient agricultural monitoring.
en-copyright=
kn-copyright=

en-aut-name=ZahirAliya Mhd
en-aut-sei=Zahir
en-aut-mei=Aliya Mhd
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=1
ORCID=

en-aut-name=SomuraHiroaki
en-aut-sei=Somura
en-aut-mei=Hiroaki
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=2
ORCID=

en-aut-name=MoroizumiToshitsugu
en-aut-sei=Moroizumi
en-aut-mei=Toshitsugu
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=3
ORCID=

affil-num=1
en-affil=Graduate School of Environmental and Life Science, Okayama University
kn-affil=

affil-num=2
en-affil=Graduate School of Environmental and Life Science, Okayama University
kn-affil=

affil-num=3
en-affil=Graduate School of Environmental and Life Science, Okayama University
kn-affil=
en-keyword=Google Earth Engine
kn-keyword=Google Earth Engine
en-keyword=agricultural practices
kn-keyword=agricultural practices
en-keyword=irrigation
kn-keyword=irrigation
en-keyword=remote sensing
kn-keyword=remote sensing
en-keyword=Sentinel-1
kn-keyword=Sentinel-1
END

start-ver=1.4
cd-journal=joma
no-vol=44
cd-vols=
no-issue=
article-no=
start-page=101225
end-page=
dt-received=
dt-revised=
dt-accepted=
dt-pub-year=2022
dt-pub=202212
dt-online=
en-article=
kn-article=
en-subject=
kn-subject=
en-title=
kn-title=Effects of local land-use policies and anthropogenic activities on water quality in the upstream Sesan River Basin, Vietnam
en-subtitle=
kn-subtitle=
en-abstract=
kn-abstract=Study region: This study focuses on the upstream Sesan River Basin in the Central Highlands of Vietnam. Study focus: Local land-use policies and human activities can significantly affect hydrology and increase the magnitude of erosion and nutrients in downstream areas. The effects in terrestrial regions on water quality of the target area were evaluated during the 2000-2018 period using the SWAT (Soil and Water Assessment Tool) with updated land-use conditions following the local policy decisions and agricultural practices in different periods. New hydrological insights for the regions: This study indicates that the implementation of the local land-use policies, along with extensive anthropogenic activities, has had significant effects on the downstream aquatic environment as compared with the period before the implementation of the land-use policies. Higher annual sediment, total nitrogen (TN), and total phosphorus (TP) load-ings were found upstream from the Poko Watershed, where range land predominated, and in southern and southwestern Dakbla Watershed, where arable land and permanent cropland pre-dominated. Arable land had the highest proportion of sediment and nutrient loadings into the reach, especially in the 2005-2009 period (conducting afforestation, agricultural expansion, and urbanization) and in the 2010-2014 period (applying crop conversion policy involving a shift from mixed forests to rubber forests). Understanding the watershed characteristics along with the combination of spatial land use, local land-use policies, and agricultural practices will support the implementation of regional land use and water resources management strategies more comprehensively.
en-copyright=
kn-copyright=

en-aut-name=TramVo Ngoc Quynh
en-aut-sei=Tram
en-aut-mei=Vo Ngoc Quynh
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=1
ORCID=

en-aut-name=SomuraHiroaki
en-aut-sei=Somura
en-aut-mei=Hiroaki
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=2
ORCID=

en-aut-name=MoroizumiToshitsugu
en-aut-sei=Moroizumi
en-aut-mei=Toshitsugu
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=3
ORCID=

en-aut-name=MaedaMorihiro
en-aut-sei=Maeda
en-aut-mei=Morihiro
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=4
ORCID=

affil-num=1
en-affil=Graduate School of Environmental and Life Science, Okayama University
kn-affil=

affil-num=2
en-affil=Graduate School of Environmental and Life Science, Okayama University
kn-affil=

affil-num=3
en-affil=Graduate School of Environmental and Life Science, Okayama University
kn-affil=

affil-num=4
en-affil=Graduate School of Environmental and Life Science, Okayama University
kn-affil=
en-keyword=Land-use policies
kn-keyword=Land-use policies
en-keyword=Land-use changes
kn-keyword=Land-use changes
en-keyword=Agricultural practices
kn-keyword=Agricultural practices
en-keyword=Water resources management
kn-keyword=Water resources management
en-keyword=Hilly areas
kn-keyword=Hilly areas
END

start-ver=1.4
cd-journal=joma
no-vol=13
cd-vols=
no-issue=5
article-no=
start-page=627
end-page=
dt-received=
dt-revised=
dt-accepted=
dt-pub-year=2021
dt-pub=20210227
dt-online=
en-article=
kn-article=
en-subject=
kn-subject=
en-title=
kn-title=The Impacts of Land-Use Input Conditions on Flow and Sediment Discharge in the Dakbla Watershed, Central Highlands of Vietnam
en-subtitle=
kn-subtitle=
en-abstract=
kn-abstract=The main objective of this study was to evaluate various land-use input conditions in terms of the performance improvement found in consequent flow and sediment simulations. The soil and water assessment tool (SWAT) was applied to the Dakbla watershed from 2000 to 2018. After the calibration and validation processes, dissimilar effects between the input conditions on the flow and sediment simulations were confirmed. It was recognized that the impact of the land use on the sediment simulation was more sensitive than with the flow simulation. Additionally, through monthly evaluation, the effects against the flow and sediment in the rainy season were larger than those in the dry season, especially for sediment simulation in the last three months from October to December. Changing land-use conditions could improve flow and sediment simulation performance better than the performance found with static land-use conditions. Updated land-use inputs should be considered in simulations if the given land-use condition changes in a relatively short period because of frequent land-use policy changes by a local government.
en-copyright=
kn-copyright=

en-aut-name=TramVo Ngoc Quynh
en-aut-sei=Tram
en-aut-mei=Vo Ngoc Quynh
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=1
ORCID=

en-aut-name=SomuraHiroaki
en-aut-sei=Somura
en-aut-mei=Hiroaki
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=2
ORCID=

en-aut-name=MoroizumiToshitsugu
en-aut-sei=Moroizumi
en-aut-mei=Toshitsugu
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=3
ORCID=

affil-num=1
en-affil=Graduate School of Environmental and Life Science, Okayama University
kn-affil=

affil-num=2
en-affil=Graduate School of Environmental and Life Science, Okayama University
kn-affil=

affil-num=3
en-affil=Graduate School of Environmental and Life Science, Okayama University
kn-affil=
en-keyword=land-use conversion
kn-keyword=land-use conversion
en-keyword=afforestation
kn-keyword=afforestation
en-keyword=deforestation
kn-keyword=deforestation
en-keyword=agricultural expansion
kn-keyword=agricultural expansion
en-keyword=urbanization
kn-keyword=urbanization
en-keyword=mountainous areas
kn-keyword=mountainous areas
en-keyword=watershed modeling
kn-keyword=watershed modeling
END

start-ver=1.4
cd-journal=joma
no-vol=26
cd-vols=
no-issue=1
article-no=
start-page=7
end-page=10
dt-received=
dt-revised=
dt-accepted=
dt-pub-year=2021
dt-pub=202103
dt-online=
en-article=
kn-article=
en-subject=
kn-subject=
en-title=Mitigation Effect of Thermal Environment on the Asphalt by Sprayed Water
kn-title=散水によるアスファルト上の暑熱環境緩和効果
en-subtitle=
kn-subtitle=
en-abstract=
kn-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.</br>
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. 
en-copyright=
kn-copyright=

en-aut-name=MOROIZUMIToshitsugu
en-aut-sei=MOROIZUMI
en-aut-mei=Toshitsugu
kn-aut-name=諸泉利嗣
kn-aut-sei=諸泉
kn-aut-mei=利嗣
aut-affil-num=1
ORCID=

en-aut-name=ITONaoya
en-aut-sei=ITO
en-aut-mei=Naoya
kn-aut-name=伊藤尚也
kn-aut-sei=伊藤
kn-aut-mei=尚也
aut-affil-num=2
ORCID=

en-aut-name=MIURATakeshi
en-aut-sei=MIURA
en-aut-mei=Takeshi
kn-aut-name=三浦健志
kn-aut-sei=三浦
kn-aut-mei=健志
aut-affil-num=3
ORCID=

affil-num=1
en-affil=
kn-affil=岡山大学大学院環境生命科学研究科

affil-num=2
en-affil=
kn-affil=前田道路㈱

affil-num=3
en-affil=
kn-affil=岡山大学大学院環境生命科学研究科（名誉教授）
en-keyword=WBGT
kn-keyword=WBGT
en-keyword=Air temperature
kn-keyword=Air temperature
en-keyword=Globe Temperature
kn-keyword=Globe Temperature
en-keyword=Thermal environment
kn-keyword=Thermal environment
en-keyword=Sprayed water
kn-keyword=Sprayed water
END

start-ver=1.4
cd-journal=joma
no-vol=26
cd-vols=
no-issue=1
article-no=
start-page=1
end-page=5
dt-received=
dt-revised=
dt-accepted=
dt-pub-year=2021
dt-pub=202103
dt-online=
en-article=
kn-article=
en-subject=
kn-subject=
en-title=Estimation of actual evapotranspiration in 3 river basins in Okayama prefecture - Comparison of Morton method and modified Brutsaert & Stricker method -
kn-title=岡山県3河川流域における実蒸発散量の推定 : Morton 法と修正 Brutsaert and Stricker 法の比較
en-subtitle=
kn-subtitle=
en-abstract=
kn-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.</br>
 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. 
en-copyright=
kn-copyright=

en-aut-name=MOROIZUMIToshitsugu
en-aut-sei=MOROIZUMI
en-aut-mei=Toshitsugu
kn-aut-name=諸泉利嗣
kn-aut-sei=諸泉
kn-aut-mei=利嗣
aut-affil-num=1
ORCID=

en-aut-name=MIURATakeshi
en-aut-sei=MIURA
en-aut-mei=Takeshi
kn-aut-name=三浦健志
kn-aut-sei=三浦
kn-aut-mei=健志
aut-affil-num=2
ORCID=

affil-num=1
en-affil=
kn-affil=岡山大学大学院環境生命科学研究科

affil-num=2
en-affil=
kn-affil=岡山大学大学院環境生命科学研究科（名誉教授）
en-keyword=Complementary relationship
kn-keyword=Complementary relationship
en-keyword=Actual evapotranspiration
kn-keyword=Actual evapotranspiration
en-keyword=Potential evapotranspiration
kn-keyword=Potential evapotranspiration
END

start-ver=1.4
cd-journal=joma
no-vol=22
cd-vols=
no-issue=1
article-no=
start-page=55
end-page=59
dt-received=
dt-revised=
dt-accepted=
dt-pub-year=2017
dt-pub=201703
dt-online=
en-article=
kn-article=
en-subject=
kn-subject=
en-title=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 -
kn-title=現地気象観測データを用いた最低気温予測方法とその精度―インターネットを利用した最低気温予報システムの改良―
en-subtitle=
kn-subtitle=
en-abstract=
kn-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.
en-copyright=
kn-copyright=

en-aut-name=UedaYu
en-aut-sei=Ueda
en-aut-mei=Yu
kn-aut-name=上田悠生
kn-aut-sei=上田
kn-aut-mei=悠生
aut-affil-num=1
ORCID=

en-aut-name=MishimaTakuya
en-aut-sei=Mishima
en-aut-mei=Takuya
kn-aut-name=三島拓也
kn-aut-sei=三島
kn-aut-mei=拓也
aut-affil-num=2
ORCID=

en-aut-name=MiuraTakeshi
en-aut-sei=Miura
en-aut-mei=Takeshi
kn-aut-name=三浦健志
kn-aut-sei=三浦
kn-aut-mei=健志
aut-affil-num=3
ORCID=

en-aut-name=MoroizumiToshitsugu
en-aut-sei=Moroizumi
en-aut-mei=Toshitsugu
kn-aut-name=諸泉利嗣
kn-aut-sei=諸泉
kn-aut-mei=利嗣
aut-affil-num=4
ORCID=

affil-num=1
en-affil=Graduate School of Environmental and life Science, Okayama University
kn-affil=岡山大学大学院環境生命科学研究科

affil-num=2
en-affil=
kn-affil=エイト日本技術開発株式会社

affil-num=3
en-affil=Graduate School of Environmental and life Science, Okayama University
kn-affil=岡山大学大学院環境生命科学研究科

affil-num=4
en-affil=Graduate School of Environmental and life Science, Okayama University
kn-affil=岡山大学大学院環境生命科学研究科
en-keyword=Minimum air temperature
kn-keyword=Minimum air temperature
en-keyword=prediction
kn-keyword=prediction
en-keyword=frost damage
kn-keyword=frost damage
en-keyword=IT
kn-keyword=IT
en-keyword=multiple regression analysis
kn-keyword=multiple regression analysis
END

start-ver=1.4
cd-journal=joma
no-vol=20
cd-vols=
no-issue=1
article-no=
start-page=35
end-page=40
dt-received=
dt-revised=
dt-accepted=
dt-pub-year=2015
dt-pub=201503
dt-online=
en-article=
kn-article=
en-subject=
kn-subject=
en-title=Building of minimum air temperature forecast system using the Internet -Design of the forecast website-
kn-title=インターネットを利用した最低気温予報システムの構築 ―予報ウェブページの設計―
en-subtitle=
kn-subtitle=
en-abstract=
kn-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.
en-copyright=
kn-copyright=

en-aut-name=MishimaTakuya
en-aut-sei=Mishima
en-aut-mei=Takuya
kn-aut-name=三島拓也
kn-aut-sei=三島
kn-aut-mei=拓也
aut-affil-num=1
ORCID=

en-aut-name=MiuraTakeshi
en-aut-sei=Miura
en-aut-mei=Takeshi
kn-aut-name=三浦健志
kn-aut-sei=三浦
kn-aut-mei=健志
aut-affil-num=2
ORCID=

en-aut-name=MoroizumiToshitsugu
en-aut-sei=Moroizumi
en-aut-mei=Toshitsugu
kn-aut-name=諸泉利嗣
kn-aut-sei=諸泉
kn-aut-mei=利嗣
aut-affil-num=3
ORCID=

affil-num=1
en-affil=
kn-affil=岡山大学大学院 環境生命科学研究科

affil-num=2
en-affil=
kn-affil=岡山大学大学院 環境生命科学研究科

affil-num=3
en-affil=
kn-affil=岡山大学大学院 環境生命科学研究科
en-keyword=Minimum air temperature
kn-keyword=Minimum air temperature
en-keyword=prediction
kn-keyword=prediction
en-keyword=internet
kn-keyword=internet
en-keyword=frozen disaster
kn-keyword=frozen disaster
END

start-ver=1.4
cd-journal=joma
no-vol=
cd-vols=
no-issue=
article-no=
start-page=23
end-page=46
dt-received=
dt-revised=
dt-accepted=
dt-pub-year=2014
dt-pub=201406
dt-online=
en-article=
kn-article=
en-subject=
kn-subject=
en-title=
kn-title=Long term trends of pan evaporation and an analysis of its causes in Finland
en-subtitle=
kn-subtitle=
en-abstract=
kn-abstract=
en-copyright=
kn-copyright=

en-aut-name=MOROIZUMIToshitsugu
en-aut-sei=MOROIZUMI
en-aut-mei=Toshitsugu
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=1
ORCID=

en-aut-name=ITONaoya
en-aut-sei=ITO
en-aut-mei=Naoya
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=2
ORCID=

en-aut-name=KOSKIAHOJari
en-aut-sei=KOSKIAHO
en-aut-mei=Jari
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=3
ORCID=

en-aut-name=TATTARISirkka
en-aut-sei=TATTARI
en-aut-mei=Sirkka
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=4
ORCID=

affil-num=1
en-affil=
kn-affil=

affil-num=2
en-affil=
kn-affil=

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

affil-num=4
en-affil=
kn-affil=
END

start-ver=1.4
cd-journal=joma
no-vol=16
cd-vols=
no-issue=1
article-no=
start-page=35
end-page=39
dt-received=
dt-revised=
dt-accepted=
dt-pub-year=2011
dt-pub=20110318
dt-online=
en-article=
kn-article=
en-subject=
kn-subject=
en-title=Improvement of complementary relationship-based evapotranspiration model
kn-title=補完関係式を用いた実蒸発散量推定式の改良
en-subtitle=
kn-subtitle=
en-abstract=
kn-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.
en-copyright=
kn-copyright=

en-aut-name=NakamichiTakeshi
en-aut-sei=Nakamichi
en-aut-mei=Takeshi
kn-aut-name=中道丈史
kn-aut-sei=中道
kn-aut-mei=丈史
aut-affil-num=1
ORCID=

en-aut-name=MoroizumiToshitsugu
en-aut-sei=Moroizumi
en-aut-mei=Toshitsugu
kn-aut-name=諸泉利嗣
kn-aut-sei=諸泉
kn-aut-mei=利嗣
aut-affil-num=2
ORCID=

en-aut-name=MiuraTakeshi
en-aut-sei=Miura
en-aut-mei=Takeshi
kn-aut-name=三浦健志
kn-aut-sei=三浦
kn-aut-mei=健志
aut-affil-num=3
ORCID=

affil-num=1
en-affil=
kn-affil=岡山大学大学院環境学研究科

affil-num=2
en-affil=
kn-affil=岡山大学環境理工学部

affil-num=3
en-affil=
kn-affil=岡山大学環境理工学部
en-keyword=Complementary relationship
kn-keyword=Complementary relationship
en-keyword=Actual evapotranspiration
kn-keyword=Actual evapotranspiration
en-keyword=Potential evapotranspiration
kn-keyword=Potential evapotranspiration
en-keyword=Water budget
kn-keyword=Water budget
END

start-ver=1.4
cd-journal=joma
no-vol=31
cd-vols=
no-issue=
article-no=
start-page=32
end-page=37
dt-received=
dt-revised=
dt-accepted=
dt-pub-year=2009
dt-pub=200912
dt-online=
en-article=
kn-article=
en-subject=
kn-subject=
en-title=Preliminary study on the measurement for water content and electric conductivity in soils using time domain reflectometry
kn-title=TDR法を用いた土壌中の水分と電気伝導度の同時測定に関する予備的検討
en-subtitle=
kn-subtitle=
en-abstract=
kn-abstract=It is very important to measure the water content and electric conductivity in soil for monitoring the environment of agricultural land continuously. TDR (Time Domain Reflectometry)method plays a key role on the
measurement of water content and electric conductivity in soils recently. Some calibrations are needed to measure them accurately. The objective of this study was to investigate preliminaly the corrections of TDR probe, the probe constant for electric conductivity, and the dependence of water pemittivity on temperature as TDR calibrations. The results showed the importance for the corrections of TDR probe and the reasonable value of probe constant.The TDR system used in this study could measure the dependence of water pemittivity on temperature.
en-copyright=
kn-copyright=

en-aut-name=MoroizumiToshitsugu
en-aut-sei=Moroizumi
en-aut-mei=Toshitsugu
kn-aut-name=諸泉利嗣
kn-aut-sei=諸泉
kn-aut-mei=利嗣
aut-affil-num=1
ORCID=

en-aut-name=KusuyamaTomoyo
en-aut-sei=Kusuyama
en-aut-mei=Tomoyo
kn-aut-name=楠山倫世
kn-aut-sei=楠山
kn-aut-mei=倫世
aut-affil-num=2
ORCID=

en-aut-name=MiuraTakeshi
en-aut-sei=Miura
en-aut-mei=Takeshi
kn-aut-name=三浦健志
kn-aut-sei=三浦
kn-aut-mei=健志
aut-affil-num=3
ORCID=

affil-num=1
en-affil=
kn-affil=岡山大学大学院環境学研究科

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=岡山大学大学院環境学研究科
en-keyword=Time domain reflectomerty
kn-keyword=Time domain reflectomerty
en-keyword=Permittivity
kn-keyword=Permittivity
en-keyword=Electric conductivity
kn-keyword=Electric conductivity
en-keyword=Probe constant
kn-keyword=Probe constant
END

start-ver=1.4
cd-journal=joma
no-vol=28
cd-vols=
no-issue=
article-no=
start-page=34
end-page=
dt-received=
dt-revised=
dt-accepted=
dt-pub-year=2006
dt-pub=200612
dt-online=
en-article=
kn-article=
en-subject=
kn-subject=
en-title=
kn-title=岡山大学「環境報告書2005－2006」の発行
en-subtitle=
kn-subtitle=
en-abstract=
kn-abstract=
en-copyright=
kn-copyright=

en-aut-name=MoroizumiToshitsugu
en-aut-sei=Moroizumi
en-aut-mei=Toshitsugu
kn-aut-name=諸泉利嗣
kn-aut-sei=諸泉
kn-aut-mei=利嗣
aut-affil-num=1
ORCID=

affil-num=1
en-affil=
kn-affil=岡山大学保健環境センター環境安全部門
END

start-ver=1.4
cd-journal=joma
no-vol=30
cd-vols=
no-issue=
article-no=
start-page=27
end-page=32
dt-received=
dt-revised=
dt-accepted=
dt-pub-year=2008
dt-pub=200812
dt-online=
en-article=
kn-article=
en-subject=
kn-subject=
en-title=
kn-title=Amplitude Domain Reflectometry法による不飽和砂地盤中のNAPL含有量と誘電率に関する基礎的研究
en-subtitle=
kn-subtitle=
en-abstract=
kn-abstract=Subsurface contamination by non-aqueous phase liquid (NAPL) has become a serious environmental issue. Therefore, it is necessary to estimate the NAPL content (θNAPL) in unsaturated soil to detect and monitor the NAPL contaminations in soil and groundwater. The objective of this study was to investigate the relationship between θNAPL and permittivity (K) in unsaturated sandy soil as a fundamental study to estimate the θNAPL. An ADR (Amplitude Domain Reflectometry) method was used to measure the K in the soil including the NAPL which was a castor oil as light NAPL or a HFE-7100 as dense NAPL. The experimental study indicated the linear relation between θNAPL and K in unsaturated soil with soil-NAPL-air. Using this relationship, we can estimate the θNAPL. On the other hand, although we obtained the relationship between θNAPL, θw and (root) K in unsaturated soil with soil-NAPL-water-air, it was not possible to estimate the θNAPL using this relationship.
en-copyright=
kn-copyright=

en-aut-name=MoroizumiToshitsugu
en-aut-sei=Moroizumi
en-aut-mei=Toshitsugu
kn-aut-name=諸泉利嗣
kn-aut-sei=諸泉
kn-aut-mei=利嗣
aut-affil-num=1
ORCID=

en-aut-name=SasakiYumi
en-aut-sei=Sasaki
en-aut-mei=Yumi
kn-aut-name=佐々木裕美
kn-aut-sei=佐々木
kn-aut-mei=裕美
aut-affil-num=2
ORCID=

en-aut-name=MiuraTakeshi
en-aut-sei=Miura
en-aut-mei=Takeshi
kn-aut-name=三浦健志
kn-aut-sei=三浦
kn-aut-mei=健志
aut-affil-num=3
ORCID=

affil-num=1
en-affil=
kn-affil=岡山大学 環境理工学部 環境管理工学科

affil-num=2
en-affil=
kn-affil=日化エンジニアリング株式会社

affil-num=3
en-affil=
kn-affil=岡山大学 環境理工学部 環境管理工学科
en-keyword=NAPL
kn-keyword=NAPL
en-keyword=Permittivity
kn-keyword=Permittivity
en-keyword=Amplitude Domain Reflectmetry
kn-keyword=Amplitude Domain Reflectmetry
en-keyword=Soil and groundwater contamination
kn-keyword=Soil and groundwater contamination
END

start-ver=1.4
cd-journal=joma
no-vol=26
cd-vols=
no-issue=
article-no=
start-page=26
end-page=27
dt-received=
dt-revised=
dt-accepted=
dt-pub-year=2004
dt-pub=20040701
dt-online=
en-article=
kn-article=
en-subject=
kn-subject=
en-title=
kn-title=水田と畑の放射収支の特徴と放射収支計の機種の違いによる測定値の差異
en-subtitle=
kn-subtitle=
en-abstract=
kn-abstract=
en-copyright=
kn-copyright=

en-aut-name=
en-aut-sei=
en-aut-mei=
kn-aut-name=吉崎文人
kn-aut-sei=吉崎
kn-aut-mei=文人
aut-affil-num=1
ORCID=

en-aut-name=
en-aut-sei=
en-aut-mei=
kn-aut-name=黒田訓宏
kn-aut-sei=黒田
kn-aut-mei=訓宏
aut-affil-num=2
ORCID=

en-aut-name=MiuraTakeshi
en-aut-sei=Miura
en-aut-mei=Takeshi
kn-aut-name=三浦健志
kn-aut-sei=三浦
kn-aut-mei=健志
aut-affil-num=3
ORCID=

en-aut-name=MoroizumiToshitsugu
en-aut-sei=Moroizumi
en-aut-mei=Toshitsugu
kn-aut-name=諸泉利嗣
kn-aut-sei=諸泉
kn-aut-mei=利嗣
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
END

start-ver=1.4
cd-journal=joma
no-vol=6
cd-vols=
no-issue=1
article-no=
start-page=81
end-page=84
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=Long-term Change Trend of Climate at Aomori City
kn-title=青森市における気候変動傾向
en-subtitle=
kn-subtitle=
en-abstract=
kn-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.
en-copyright=
kn-copyright=

en-aut-name=MoroizumiToshitsugu
en-aut-sei=Moroizumi
en-aut-mei=Toshitsugu
kn-aut-name=諸泉利嗣
kn-aut-sei=諸泉
kn-aut-mei=利嗣
aut-affil-num=1
ORCID=

en-aut-name=SatoYuichi
en-aut-sei=Sato
en-aut-mei=Yuichi
kn-aut-name=佐藤裕一
kn-aut-sei=佐藤
kn-aut-mei=裕一
aut-affil-num=2
ORCID=

en-aut-name=SatoKoichi
en-aut-sei=Sato
en-aut-mei=Koichi
kn-aut-name=佐藤幸一
kn-aut-sei=佐藤
kn-aut-mei=幸一
aut-affil-num=3
ORCID=

en-aut-name=MiuraTakeshi
en-aut-sei=Miura
en-aut-mei=Takeshi
kn-aut-name=三浦健志
kn-aut-sei=三浦
kn-aut-mei=健志
aut-affil-num=4
ORCID=

affil-num=1
en-affil=
kn-affil=岡山大学

affil-num=2
en-affil=
kn-affil=北里大学獣医畜産学部

affil-num=3
en-affil=
kn-affil=北里大学獣医畜産学部

affil-num=4
en-affil=
kn-affil=岡山大学
en-keyword=Air temperature
kn-keyword=Air temperature
en-keyword=precipitation
kn-keyword=precipitation
en-keyword=snowfall-depth
kn-keyword=snowfall-depth
en-keyword=long-term change
kn-keyword=long-term change
en-keyword=Aomori city
kn-keyword=Aomori city
END

start-ver=1.4
cd-journal=joma
no-vol=7
cd-vols=
no-issue=1
article-no=
start-page=107
end-page=111
dt-received=
dt-revised=
dt-accepted=
dt-pub-year=2002
dt-pub=20020322
dt-online=
en-article=
kn-article=
en-subject=
kn-subject=
en-title=Long-term Trend of Rainfall at Tsudaka Farm of Okayama University
kn-title=岡山大学津高牧場における降雨変動特性
en-subtitle=
kn-subtitle=
en-abstract=
kn-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.
en-copyright=
kn-copyright=

en-aut-name=MoroizumiToshitsugu
en-aut-sei=Moroizumi
en-aut-mei=Toshitsugu
kn-aut-name=諸泉利嗣
kn-aut-sei=諸泉
kn-aut-mei=利嗣
aut-affil-num=1
ORCID=

en-aut-name=YomotaAtsushi
en-aut-sei=Yomota
en-aut-mei=Atsushi
kn-aut-name=四方田穆
kn-aut-sei=四方田
kn-aut-mei=穆
aut-affil-num=2
ORCID=

en-aut-name=MiuraTakeshi
en-aut-sei=Miura
en-aut-mei=Takeshi
kn-aut-name=三浦健志
kn-aut-sei=三浦
kn-aut-mei=健志
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=Rainfall
kn-keyword=Rainfall
en-keyword=Rainfall intensity
kn-keyword=Rainfall intensity
en-keyword=Rainfall duration
kn-keyword=Rainfall duration
en-keyword=Talbot formula
kn-keyword=Talbot formula
en-keyword=Long-term trend
kn-keyword=Long-term trend
en-keyword=Tsudaka Farm of Okayama University
kn-keyword=Tsudaka Farm of Okayama University
END

start-ver=1.4
cd-journal=joma
no-vol=8
cd-vols=
no-issue=1
article-no=
start-page=81
end-page=85
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=Survey on Spatial Variability of Surface Soil Moisture and Soil Physical Properties in a Sloping Grassland Field
kn-title=傾斜草地における表層土壌水分と土壌物理性の空間分布調査
en-subtitle=
kn-subtitle=
en-abstract=
kn-abstract=Spatial variability of surface soil moisture, bulk density, satureted hydraulic conductivity, and penetration resistance (cone index) in a sloping grassland field were surveyed. The typical results were as follows: (1) The surface soil moisture and the bulk density were normally distributed at a significant level of 0.05. (2) The surface soil moistures were higher at low area than in high and slope area. The coefficients of variation were larger at slope area. (3) The coefficients of variation for bulk density were larger at slope area than in low area. (4) The distribution of saturated hydraulic conductivity can be considered to be log-normally distributed. (5) The cone index showed the normal distribution.
en-copyright=
kn-copyright=

en-aut-name=MoroizumiToshitsugu
en-aut-sei=Moroizumi
en-aut-mei=Toshitsugu
kn-aut-name=諸泉利嗣
kn-aut-sei=諸泉
kn-aut-mei=利嗣
aut-affil-num=1
ORCID=

affil-num=1
en-affil=
kn-affil=岡山大学
en-keyword=Spatial variability
kn-keyword=Spatial variability
en-keyword=Surface soil moisture
kn-keyword=Surface soil moisture
en-keyword=Bulk density
kn-keyword=Bulk density
en-keyword=Saturated hydraulic conductivity
kn-keyword=Saturated hydraulic conductivity
en-keyword=Cone index
kn-keyword=Cone index
END

start-ver=1.4
cd-journal=joma
no-vol=9
cd-vols=
no-issue=1
article-no=
start-page=117
end-page=120
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=Measurement of thermal conductivity in soils and application of de Vries model
kn-title=土壌熱伝導率の測定と推定式の適用
en-subtitle=
kn-subtitle=
en-abstract=
kn-abstract=Thermal conductivity of soil samples were measured using a twin transient-state cylindrical-probe method. The system of measurement consists of DC power supply, data logger, personal computer, 100cc soil sample, reference material sample, and two heat probes. The typical results were as follows: (1) Thermal conductivity of soils increased according to an increase of soil water content. (2) The thermal conductivity of Toyoura sand was larger than one of Kuroboku soil. (3) The thermal conductivity estimated by de Vries model had good agreement with the measured value.
en-copyright=
kn-copyright=

en-aut-name=MoroizumiToshitsugu
en-aut-sei=Moroizumi
en-aut-mei=Toshitsugu
kn-aut-name=諸泉利嗣
kn-aut-sei=諸泉
kn-aut-mei=利嗣
aut-affil-num=1
ORCID=

en-aut-name=SatoYuichi
en-aut-sei=Sato
en-aut-mei=Yuichi
kn-aut-name=佐藤裕一
kn-aut-sei=佐藤
kn-aut-mei=裕一
aut-affil-num=2
ORCID=

en-aut-name=SatoKoichi
en-aut-sei=Sato
en-aut-mei=Koichi
kn-aut-name=佐藤幸一
kn-aut-sei=佐藤
kn-aut-mei=幸一
aut-affil-num=3
ORCID=

en-aut-name=SasakiChoichi
en-aut-sei=Sasaki
en-aut-mei=Choichi
kn-aut-name=佐々木長市
kn-aut-sei=佐々木
kn-aut-mei=長市
aut-affil-num=4
ORCID=

affil-num=1
en-affil=
kn-affil=岡山大学

affil-num=2
en-affil=
kn-affil=北里大学獣医畜産学部

affil-num=3
en-affil=
kn-affil=北里大学獣医畜産学部

affil-num=4
en-affil=
kn-affil=弘前大学農学生命科学部
en-keyword=Thermal conductivity
kn-keyword=Thermal conductivity
en-keyword=Twin transient-state cylindrical-probe method
kn-keyword=Twin transient-state cylindrical-probe method
en-keyword=de Vries model
kn-keyword=de Vries model
en-keyword=Volumetric water content
kn-keyword=Volumetric water content
END

start-ver=1.4
cd-journal=joma
no-vol=11
cd-vols=
no-issue=1
article-no=
start-page=89
end-page=92
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=Measurement of thermal conductivity in the soils of Shirakami Mountains
kn-title=白神山地の土壌熱伝導率の測定
en-subtitle=
kn-subtitle=
en-abstract=
kn-abstract=Thermal conductivity of soils in Shirakami Mountains that was registered on UNESCO's World Natural Heritage in 1993 were measured using a twin transient-state cylindrical-probe method. The typical results were as follows:(1) Thermal conductivity of the soils in Shirakami Mountains increased according to an increase of soil water content, which was the same tendency as the other soils. (2) The thermal conductivity of the soils was about 0.2～0.3 Wm(-1)K(-1) smaller than volcanic ash soils, and it showed the same tendency as leaf mold.
en-copyright=
kn-copyright=

en-aut-name=HanzawaWakako
en-aut-sei=Hanzawa
en-aut-mei=Wakako
kn-aut-name=繁澤和佳子
kn-aut-sei=繁澤
kn-aut-mei=和佳子
aut-affil-num=1
ORCID=

en-aut-name=MoroizumiToshitsugu
en-aut-sei=Moroizumi
en-aut-mei=Toshitsugu
kn-aut-name=諸泉利嗣
kn-aut-sei=諸泉
kn-aut-mei=利嗣
aut-affil-num=2
ORCID=

en-aut-name=SasakiChoichi
en-aut-sei=Sasaki
en-aut-mei=Choichi
kn-aut-name=佐々木長市
kn-aut-sei=佐々木
kn-aut-mei=長市
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=弘前大学農学生命科学部
en-keyword=Shirakami Mountains
kn-keyword=Shirakami Mountains
en-keyword=Thermal conductivity
kn-keyword=Thermal conductivity
en-keyword=Twin transient-state cylindrical-probe method
kn-keyword=Twin transient-state cylindrical-probe method
en-keyword=Volumetric water content
kn-keyword=Volumetric water content
END