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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.

DOI： 10.3390/w13050627

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Language：Japanese   Publishing type：Research paper (scientific journal)   Publisher：Japanese Association of Groundwater Hydrology  

DOI： 10.5917/jagh.59.355

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DOI： 10.11408/jsidre.85.II_45

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Language：Japanese   Publishing type：Research paper (scientific journal)   Publisher：The Japanese Geotechnical Society  

A 2-dimensional advection-dispersion analysis was carried out to examine the infiltration path and area of de-icing agent into groundwater along an expressway which has been used more than 30 years in a hilly and mountainous area. The results were as follows: Analytic values approximately agreed with observed values. The de-icing agent infiltrated and moved about 300 m distance from the expressway to the river for 15 years, and the salinity of de-icing agent at the observation points rose gradually with decreasing its rising rate. If the spraying of de-icing agent was stopped, it was predicted that it took about 30 years for the water quality of groundwater at existing wells to return to the original values before spraying it. Furthermore, it was found, as an infiltration mechanisn of de-icing agent, the shattered zone with high permeability greatly affected the infiltration path and area of de-icing agent.

DOI： 10.3208/jgs.11.269

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Authorship：Last author   Language：Japanese   Publishing type：Research paper (scientific journal)   Publisher：The Japanese Geotechnical Society  

DOI： 10.3208/jgs.10.461

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The characteristics of evapotranspiration estimated by the complementary relationship actual evapotranspiration (CRAE), the advection-aridity (AA), and the modified advection-aridity (MAA) models were investigated in six pairs of rural and urban areas of Japan in order to evaluate the applicability of the three models the urban area. The main results are as follows: 1) The MAA model could apply to estimating the actual evapotranspiration in the urban area. 2) The actual evapotranspirations estimated by the three models were much less in the urban area than in the rural. 3) The difference among the estimated values of evapotranspiration in the urban areas was significant, depending on each model, while the difference among the values in the rural areas was relatively small. 4) All three models underestimated the actual evapotranspiration in the urban areas from humid surfaces where water and green spaces exist. 5) Each model could take the effect of urbanization into account.

DOI： 10.1515/johh-2015-0011

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Authorship：Lead author   Language：Japanese   Publishing type：Research paper (scientific journal)   Publisher：The Japanese Society of Irrigation, Drainage and Rural Engineering  

A multiple regression model was used to predict the averaged soil water content in root zone instead of solving a Richards' equation numerically, which of applicability was examined. (1) The soil water content of the depth of 5cm (model I) or (2) the effective rainfall and evapotranspiration (model II) were used as the explanatory variables of the multiple regression model. As a result, it became clear that both models could predict the averaged soil water content in the root zone. In addition, it was necessary to convert the original data to its difference and to apply them to the multiple regression model because it was judged that the decrease of the autocorrelation coefficient for the time series data of soil water contents was slow, and therefore, the explanatory variables were correlated each other.

DOI： 10.11408/jsidre.82.47

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Other Link： http://ousar.lib.okayama-u.ac.jp/44792

Authorship：Lead author   Language：Japanese   Publishing type：Research paper (scientific journal)   Publisher：Japanese Association of Groundwater Hydrology  

DOI： 10.5917/jagh.53.73

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DOI： 10.11408/jsidre.78.429

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Other Link： http://eprints.lib.okayama-u.ac.jp/42678

Authorship：Lead author   Language：Japanese   Publishing type：Research paper (scientific journal)   Publisher：THE JAPAN SOCIETY OF HYDROLOGY AND WATER RESOURCES  

The Makkink equation can estimate potential evaporation using only air temperature and sunshine duration. Therefore, it is convenient for use in developing countries where there is an insufficient amount of meteorological data. The two coefficients employed in the equation were determined to fit the estimations of the Penman equation, and the accuracy of the estimations by the Makkink equation were investigated. The results showed that the accuracy was best when the estimations were made with the coefficients which depend on each locality, and that the accuracy was further improved with the coefficients which depend on each climatological zone. The relationship between the two coefficients showed a negative correlation, which was addressed in a previous study.

DOI： 10.3178/jjshwr.22.479

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Authorship：Lead author   Language：English   Publishing type：Research paper (scientific journal)   Publisher：ELSEVIER SCIENCE BV  

Northeast Thailand has a semi-humid tropical climate which is characterized by dry and rainy seasons. In order to stabilize crop production, it may be necessary to develop new water resources, such as soil moisture and groundwater, instead of rainfed resources. This is because rainfed agriculture has already been unsuccessfully tried in many areas of this region. In this study, we investigate the soil water content in rainfed fields in Khon Kaen in Northeast Thailand, where rice and sugarcane were planted, over a 1-year period that contained both dry and rainy seasons, and estimate the actual evapotranspiration (ET.) using micrometeorological data. In addition, we assess the water balance from the results of the soil water content investigation and the actual evapotranspiration. Although the soil water content at depths above 0.6 m in both the lower and the sloping fields gradually decreased during the dry season, the soil water content at a depth of 1.0 m. was under almost constant wet conditions. Two-dimensional profiles of the soil water content demonstrated that at the end of the dry season, the soil layers below a depth of 0.4 m. showed a soil water content of more than 0.10-0.15 m(3) m(-3), thus suggesting that water was supplied to the sugarcane from those layers. The range in ET, rates was almost the same as that in the previous study. The average ETa rates were 3.7 mm, d(-1) for the lower field and 4.2 mm d(-1) for the sloping field. In the dry season, an upward water flow of 373 mm (equivalent to a flux of 1.9 mm. d(1)) was estimated from outside the profile. The source of this upward water flow was the sandy clay (SC) layer below a depth of 1 m. It was this soil water supply from the SC layer that allowed the sugarcane to grow without irrigation. (C) 2008 Elsevier B.V. All rights reserved.

DOI： 10.1016/j.agwat.2008.07.007

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Authorship：Lead author   Language：Japanese   Publishing type：Research paper (bulletin of university, research institution)   Publisher：岡山大学環境管理センター  

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.

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Authorship：Lead author   Language：English   Publishing type：Research paper (scientific journal)   Publisher：SOIL SCI SOC AMER  

Groundwater contamination by nonaqueous-phase liquids (NAPLs) has become a serious environmental issue. Therefore, it is necessary to estimate the NAPL content (theta(NAPL)) in saturated soil to detect and monitor the NAPL contamination in groundwater. The objective of this study was to investigate three estimation methods for the theta(NAPL) in saturated sandy soil, namely, the noncalibration method (NCM), the permittivity regression method (PRM), and the best-fit alpha method (BF alpha M). These methods utilize the permittivity (K) measured by amplitude domain reflectometry (ADR) and two dielectric mixing models: a theoretical Maxell-de Loor (MD) model and an empirical a model. The NCM applies the measured K to the models directly. The PRM applies the measured K to the models indirectly using the regression equation between the measured and estimated K The RMSEs of the NCM for the alpha model were 0.038 m(3) m(-3) for light NAPL (LNAPL) and 0.015 m(3) m(-3) for dense NAPL (DNAPL) when the constant alpha value was set at 0.5. The RMSEs of the MD model, however, were 0.090 m(3) m(-3) for LNAPL and 0.070 m(3) m(-3) for DNAPL. Using the PRM, the RMSEs of the MID model became much better than those of the NCM. The RMSEs for theta(NAPL) estimated by the BF alpha M were 0.007 m(3) m(-3) for LNAPL and 0.018 m(3) m(-3) for DNAPL. These results demonstrate that theta(NAPL) was estimated easily and with sufficient accuracy with the alpha model and the PRM.

DOI： 10.2136/sssaj2006.0212

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Authorship：Lead author   Language：Japanese   Publishing type：Research paper (scientific journal)   Publisher：THE JAPAN SOCIETY OF HYDROLOGY AND WATER RESOURCES  

The soil water content was measured using a Profile Probe PR1 soil moisture sensor (Delta-T Devices, Ltd.) to develop water resources in rain-fed land with paddies and sloping fields in Northeast Thailand. The PR1 sensor uses a kind of amplitude domain reflectometry (ADR) as its measuring technique. In order to determine the soil water content with the PR1, it is necessary to establish specific calibration equations between the output voltage of the PR1 and the measured values of the soil water content. The objectives of this study were to present an in situ calibration of the PR1 and to measure the soil water content in the above-mentioned rain-fed land. The in situ calibration makes it possible to measure the water content of undisturbed soil samples and does not require the adjustment of the soil water content. The calibration equations resulted in a Bolzmann function for loamy sand and a liner function for sandy clay. Changes in the soil water content below a depth of 60 cm, for both the rain-fed paddies and the sloping fields, were not very large, and the high soil water content was maintained for over a year. It was found that the rain-fed paddies stored more soil water than the sloping fields.

DOI： 10.3178/jjshwr.21.361

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Language：English   Publishing type：Research paper (scientific journal)  

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Authorship：Lead author   Language：Japanese   Publishing type：Research paper (scientific journal)   Publisher：Japanese Association of Groundwater Hydrology  

The simple methods for estimating NAPL content in saturated sandy soil using a volumetric heat capacity have been proposed as a fundamental study for measuring the NAPL content in groundwater. A dual-probe heat-pulse method was used to measure the volumetric heat capacity. The estimations of NAPL contents which were obtained by substituting the measurements of volumetric heat capacity into its model did not have a better accuracy than those by the calibration equation between known NAPL content and volumetric heat capacity, but could be close to the known NAPL contents. The estimations of NAPL contents were greatly improved when the regression line between the measured and estimated volumetric heat capacities.

DOI： 10.5917/jagh1987.50.17

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Authorship：Last author   Language：Japanese   Publishing type：Research paper (scientific journal)   Publisher：The Japanese Agricultural Systems Society  

A water-saving cultivation technology for tomatoes has been developed in Nong Saeng village, Khon Kaen Province, Northeast Thailand. The technology utilizes the water stored in the soil during the rainy season. By using this technology, it is possible to reduce the amount of irrigation water used to less than 5 mm per crop cycle. In this area, the standard irrigation level is more than 500 mm. Since this technology is considered to depend on soil moisture, we demonstrated the mechanisms involved by using a soil moisture simulation. Further, we evaluated the applicability of the technology to other soil types in Northeast Thailand. In brief, the method we used was as follows. In the first step, we simulated the actual soil moisture dynamics from the end of the rainy season to the period of transplanting. In the next step, we carried out identical simulations for four soil types typical to Northeast Thailand. On the basis of the results obtained, we evaluated the applicability of the water-saving technology by comparing the water supply capacity of each soil type. For the analysis, we used the HYDRUS-1D simulation code, which has often been used in the agricultural field. The initial soil condition at the end of the rainy season (September 23, 2004) was designated as the saturated condition. The parameter for the dry sand layer effect was adjusted so that can be equal to the soil moisture condition of the transplanting time (December 1, 2004). The actual evaporation observed during this period was 150 mm. It was enough big dry sand layer effect to the 420 mm of the potential evaporation. Further, using these parameters, we simulated the soil conditions present from the time of transplanting to the time of harvesting. The results obtained were similar to the soil moisture dynamics that we had measured. Lastly, we simulated the soil moisture dynamics in the four soil types that are typical to Northeast Thailand （Nam Phong, Ubon, Roi-Et, Phimai）. We compared the water supply capacities of these soil types. We observed that the technology was more suitable for Roi-Et and Phimai than for Nam Phong, where it was developed. The suitability of Ubon for the usage of this technology was lower than that of Nam Phong; however, the difference between the two was small. These results demonstrate that this water-saving technology can be applied to a large area of Northeast Thailand.

DOI： 10.14962/jass.23.3_245

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Authorship：Last author   Language：Japanese   Publishing type：Research paper (scientific journal)  

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Authorship：Lead author,　Corresponding author   Language：Japanese   Publishing type：Research paper (bulletin of university, research institution)   Publisher：岡山大学環境理工学部  

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Authorship：Last author   Language：Japanese   Publishing type：Research paper (scientific journal)   Publisher：Japan Society of Civil Engineers  

The water environmet is one of the most important factors to indicate "Quality of Life" in neighborhood scale. This study aims to estimate the evaluation model for water environment based on the questionnaire survey in Okayama city. It is also examined that the evaluation reliability by residents for bio-chemical water quality in town stream. As the results, it is clarified that the certain amount of water flow is required to realize acceptable evaluation of water environment by neighbors. Contrarily, it is also found that higher water quality from bio-chemical points of view is not always necessary in town planning. The most significant political suggestion from the concept of water recycle is to utilize underground water resources that comes from sewage.

DOI： 10.2208/proer.33.125

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Language：Japanese   Publishing type：Research paper (bulletin of university, research institution)   Publisher：Hirosaki University  

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Language：Japanese   Publishing type：Research paper (scientific journal)   Publisher：土壌物理学会  

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Language：English   Publishing type：Research paper (scientific journal)   Publisher：JAPAN INT RESEARCH CENTER AGRICULTURAL SCIENCES  

Bromide (Br) was used to successfully trace the infiltration of rainfall through a sandy soil in northeast Thailand. A method was developed to measure the Br concentration in extracted water from soil samples in order to determine the vertical distribution of the Br concentration in soil water. Our experimental results revealed that Br moved downward with a piston flow and that the increase in the amount of water in the soil above the depth of the peak Br concentration equaled the increase in soil moisture caused by the infiltration. Using our method, we found that the largest amount of rainfall infiltration occurred during September. The amount of soil water above the peak Br concentration was calculated to be about 0 1 urn during the period between June 27, 2003 and August 7, 2003; about 100 mm during the period between June 27, 2003 and September 10, 2003; and about 80 mm during the period between June 27, 2003 and February 12, 2004.

DOI： 10.6090/jarq.39.29

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Authorship：Lead author,　Corresponding author   Language：English   Publishing type：Research paper (scientific journal)   Publisher：SOIL SCI SOC AMER  

Tillage near the soil surface may greatly influence drainage discharge and pressure head values in the subsurface zone. In this study, a controlled comparative experiment was conducted in the field under natural weather conditions, using a tilled and an untilled column, to evaluate the effects of tillage on subsurface drainage discharge and pressure head values. There were no significant differences between the two columns in subsurface drainage before tillage treatment before the study, as checked by a preliminary experiment. After tilling one column of the two columns, cumulative subsurface drainage discharge was larger and occurred earlier for the tilled column than for the untilled column. The measured drainage discharge and pressure head values were evaluated using the water movement model, HYDRUS version 6.0, which numerically solves the Richards equation. The HYDRUS model reproduced measured values well for subsurface drainage discharge and pressure head values after the tillage, as determined by root mean squared error (RMSE), mean bias error (MBE), and R(2). Therefore, it is concluded that the model, which includes the effects of tillage on the hydraulic properties, can explain the reasons for differences in observed drainage in the two columns. Moreover, the effects of tillage depth on subsurface drainage discharge were simulated. The results implied that the effect of tillage on subsurface drainage were induced by the conditions of pressure head just before the first rainfall, and this effect was equal to, or greater than, the effects of changes in hydraulic properties due to tillage.

DOI： 10.2136/sssaj2004.113

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Authorship：Last author   Language：Japanese   Publishing type：Research paper (scientific journal)   Publisher：The Japanese Society of Irrigation, Drainage and Rural Engineering  

In the paddy field with gravel and sand subsoil that was low groundwater level, the plane changes in concentrations of oxygen and carbon dioxide were investigated over 2 years. The soil air was sampled from the subsoil in about 50cm depth at 1, 5, 10 and 15m from the levee to the center. Those points situated one line and three lines were investigated in this paddy field.<BR>Following results were obtained. Those oxygen concentrations at each point gradually decreased in irrigation period and the lowest concentration were observed in early September. In non-irrigation period, those concentrations increased, and eventually reached the atomospheric level. On the other hand, the carbon dioxide concentrations in the subsoil increased gradually in irrigation period and the highest concentration were observed in early September. In non-irrigation period, those concentrations decreased. This tendency of changes in carbon dioxide was in inverse relation to that in oxygen. These annual changes in concentrations of two parameters were recognized. As the distance from the levee increased, the oxygen concentration tend to be lower and those carbon dioxide concentrations higher. The total concentrations of oxygen and carbon dioxide became nearly equal to 21% at each sampling point.

DOI： 10.11408/jsidre1965.2004.15

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Other Link： http://eprints.lib.okayama-u.ac.jp/11469

Authorship：Lead author,　Corresponding author   Language：Japanese   Publishing type：Research paper (scientific journal)  

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DOI： 10.11408/jsidre1965.2002.447

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Other Link： http://ousar.lib.okayama-u.ac.jp/11507

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Authorship：Lead author,　Corresponding author   Language：English   Publishing type：Research paper (scientific journal)   Publisher：LIPPINCOTT WILLIAMS & WILKINS  

Tillage in farmland plays an important role not only as a soil management tool for improving the plant root environment, but also as a factor that impacts the hydrological cycle and the energy balance in a region. This is because tillage affects soil moisture and soil temperature greatly in the unsaturated soil zone near the surface, which acts as an interface between the subsurface and the low atmosphere boundary.
In this study, field experiments were conducted under natural weather conditions using two columns of a volcanic ash (andosol) soil to estimate the effects of tillage on soil temperature, pressure head, and evaporation in the unsaturated soil zone. The experimental results were compared with simulated pressure head and soil temperature values in the unsaturated soil zone. A one- dimensional model for simultaneous heat and water transport, based on the theory proposed by P. C. D. Milly in 1982 and 1984, was used. The governing equations were solved by the Galerkin finite element method. The simulated soil temperatures were in good agreement with the measured soil temperatures at most of the soil depths for both columns. After tillage, however, the simulated soil temperatures of the tilled column were higher than those of the untilled column for depths of 4, 9, and 14 cm in the daytime. The simulated pressure head values were in agreement with the measured values up to the tillage in the tilled column. After the tillage treatment for the tilled column and 60 h of elapsed time for the untilled column, the simulated pressure head values were in poorer agreement with the measured ones. After the tillage, however, the simulated pressure head values were greater for the tilled column than for the untilled column for depths of 5, 10, and 25 cm. This reflects the same results as with the measured pressure head results.

DOI： 10.1097/01.ss.0000026972.27546.6b

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Authorship：Lead author,　Corresponding author   Language：Japanese   Publishing type：Research paper (scientific journal)  

DOI： 10.11408/jsidre1965.2002.447

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Authorship：Lead author,　Corresponding author   Language：Japanese   Publishing type：Research paper (conference, symposium, etc.)   Publisher：水資源シンポジウム委員会  

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Other Link： http://ousar.lib.okayama-u.ac.jp/11536

Authorship：Lead author,　Corresponding author   Language：Japanese   Publishing type：Research paper (scientific journal)   Publisher：土壌物理学会  

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Authorship：Lead author,　Corresponding author   Language：Japanese   Publishing type：Research paper (bulletin of university, research institution)   Publisher：岡山大学環境理工学部  

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Authorship：Lead author,　Corresponding author   Language：Japanese   Publishing type：Research paper (scientific journal)   Publisher：THE JAPAN SOCIETY OF HYDROLOGY AND WATER RESOURCES  

A simple method of pF measurement was developed by combining TDR-Tensiometer with TDR-Hygrometer. Using this method, we can measure the soil moisture characteristic curve over the wide range easily. This method was applied to the soil moisture characteristic curve of Toyoura sand. The experimental results were compared with those of the ordinary methods (e.g., suction and pressure plate methods), and its availability was discussed. As a result, the values measured by the TDR-Tensiometer were in good agreement with those of the ordinary methods, but the values measured by the TDR-Hygrometer were not satisfactory. Some problems to be overcome in the future were presented.

DOI： 10.3178/jjshwr.13.240

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Authorship：Lead author,　Corresponding author   Language：Japanese   Publishing type：Research paper (scientific journal)   Publisher：THE JAPAN SOCIETY OF HYDROLOGY AND WATER RESOURCES  

The field experiments were conducted by using two columns in order to estimate the effects of tillage on the temperature and water in an unsaturated soil zone. The effects were shown by being compared with values obtained in the no-till column. The results were as follows: an increase in soil temperature in tilled zone; an increase of pressure head below the tilled zone; a reduction of cumulative evaporation by tillage; and increased air temperature near the soil surface.

DOI： 10.3178/jjshwr.11.61

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Authorship：Lead author,　Corresponding author   Language：Japanese   Publishing type：Doctoral thesis  

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Authorship：Lead author,　Corresponding author   Language：Japanese   Publishing type：Research paper (scientific journal)   Publisher：THE JAPAN SOCIETY OF HYDROLOGY AND WATER RESOURCES  

The phenomenon of coupled heat and water transfer in soil plays an important role as a part of the hydrologic cycle. In this paper, the characteristics of heat and water transfer in the unsaturated soil zone under field conditions were investigated by applying the coupled heat and water transfer model to the soil temperatures and pressure heads which were measured under natural weather conditions. Furthermore, the influences of a correction coefficientζand surface boundary conditions on the changes of temperature and pressure head in the soil, and the estimation of evaporation by a water balance method were discussed. The typical results were as follows: (1)The directions of fluxes driven by soil temperature gradients had complicated daily variations by the changes of the soil temperature profile, compared with those of fluxes driven by pressure head gradients. (2)The flux with water movement was a downward flow in all layers at night (2:00) and in the morning (8:00), but it was a upward flow in upper layers above 10cm in depth in the daytime (13:00, 16:00). (3)The main components of water and heat fluxes were the ql driven by the liquid water movement and the qhc by heat conduction, respectively. (4)The sensitivity analysis of the ζ showed that there were slight differences between the calculated values for each ζ. (5)The sensitivity analysis of the surface boundary conditions showed that the sensitivities of soil temperature and pressure head were greater near the soil surface. It was inferred from this result that the differences between the measured and the calculated values in pressure heads in layers deeper than 25cm weren't affected by surface boundary conditions. (6)Evaporation estimated by a water balance method was used. The amount of evaporation estimated by calculated pressure heads was a little larger than the one by the measured values.

DOI： 10.3178/jjshwr.10.20

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Authorship：Last author   Language：Japanese   Publishing type：Research paper (scientific journal)   Publisher：Japanese Society of Grassland Science  

The morphology of macropores in the root zones of grassland in Brown forest soil, England, was investigated in the present study. The structure of macropores was determined by three dimensional stereoscopic-radiography of macropore morphology and examination of the physical condition of the soil. The soil samples were collected from four layers of root-zones that were shallower than 85cm in depth in a 14-year-old perennial ryegrass pasture. Each soil layer had a clay texture, and was dense and solid. The porosity rate was between 54% (surface layer; 0-5cm) and 38% (subsoil layer; 80-85cm). The non-capillary pores of the first soil layer (0-10cm) consisted of pores formed by earthworms and aggregates, and in the second to the fourth soil layers (10-85cm) the pores were formed by roots. The capillary pores in the surface layer (first layer) consisted of pores formed by roots and pores of inter-particles and inter-aggregates. In the subsoil layer, the capillary pores were formed by roots. Thus, similar to the pore morphology of the Andosols, Steppe soil cases and Red yellow soil, most macropores of grassland in Brown forest soil, England, are tubular in shape and formed by plant roots.

DOI： 10.14941/grass.43.325

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Authorship：Lead author,　Corresponding author   Language：Japanese   Publishing type：Research paper (scientific journal)  

DOI： 10.11408/jsidre1965.1996.661

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Language：Japanese   Publishing type：Research paper (scientific journal)  

DOI： 10.11408/jsidre1965.1996.39

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Language：Japanese   Publishing type：Research paper (scientific journal)   Publisher：Japanese Association of Groundwater Hydrology  

DOI： 10.5917/jagh1987.33.227

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Total pages：183   Responsible for pages：69-75   Language：Japanese Book type：Dictionary, encyclopedia

CiNii Books

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Language：Japanese   Publishing type：Article, review, commentary, editorial, etc. (scientific journal)  

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Authorship：Last author   Language：Japanese   Publishing type：Research paper, summary (national, other academic conference)   Publisher：農業農村工学会  

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Language：Japanese   Publishing type：Research paper, summary (national, other academic conference)   Publisher：一般社団法人 水文・水資源学会  

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Authorship：Corresponding author   Language：Japanese   Publishing type：Research paper, summary (national, other academic conference)   Publisher：一般社団法人 水文・水資源学会  

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Authorship：Corresponding author   Language：Japanese   Publishing type：Research paper, summary (national, other academic conference)   Publisher：（公）農業農村工学会  

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Authorship：Last author   Language：Japanese   Publishing type：Research paper, summary (national, other academic conference)   Publisher：（公）農業農村工学会  

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Language：Japanese   Publishing type：Research paper, summary (national, other academic conference)  

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Authorship：Last author   Language：Japanese   Publishing type：Research paper, summary (national, other academic conference)  

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Authorship：Corresponding author   Language：Japanese   Publishing type：Research paper, summary (national, other academic conference)  

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Authorship：Last author   Language：Japanese   Publishing type：Research paper, summary (national, other academic conference)  

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Language：Japanese   Publisher：土壌物理学会  

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Authorship：Last author   Language：Japanese   Publishing type：Article, review, commentary, editorial, etc. (scientific journal)   Publisher：土壌物理学会  

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Language：Japanese   Publishing type：Research paper, summary (national, other academic conference)   Publisher：土壌物理学会  

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Authorship：Last author   Language：Japanese   Publishing type：Research paper, summary (national, other academic conference)  

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Authorship：Corresponding author   Language：Japanese   Publishing type：Research paper, summary (national, other academic conference)  

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Authorship：Last author   Language：Japanese   Publishing type：Research paper, summary (national, other academic conference)  

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Authorship：Last author   Language：Japanese   Publishing type：Research paper, summary (national, other academic conference)  

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Authorship：Last author   Language：Japanese   Publishing type：Research paper, summary (national, other academic conference)  

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Authorship：Last author   Language：Japanese   Publishing type：Research paper, summary (national, other academic conference)  

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Language：Japanese   Publishing type：Research paper, summary (national, other academic conference)  

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Authorship：Last author   Language：Japanese   Publishing type：Research paper, summary (national, other academic conference)   Publisher：土壌物理学会  

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Language：Japanese   Publishing type：Research paper, summary (national, other academic conference)   Publisher：土壌物理学会  

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Authorship：Lead author   Language：Japanese   Publishing type：Research paper, summary (national, other academic conference)  

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Authorship：Lead author   Language：Japanese   Publishing type：Research paper, summary (national, other academic conference)  

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Authorship：Lead author,　Corresponding author   Language：English  

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Authorship：Last author   Language：Japanese   Publishing type：Research paper, summary (national, other academic conference)  

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Language：Japanese   Publishing type：Article, review, commentary, editorial, etc. (scientific journal)   Publisher：土壌物理学会  

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Language：Japanese   Publishing type：Research paper, summary (national, other academic conference)  

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Authorship：Corresponding author   Language：Japanese   Publishing type：Research paper, summary (national, other academic conference)  

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Authorship：Corresponding author   Language：Japanese   Publishing type：Research paper, summary (national, other academic conference)  

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Authorship：Last author   Language：Japanese   Publishing type：Research paper, summary (national, other academic conference)  

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Authorship：Last author   Language：Japanese   Publishing type：Research paper, summary (national, other academic conference)  

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Authorship：Corresponding author   Language：Japanese   Publishing type：Research paper, summary (national, other academic conference)  

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Authorship：Corresponding author   Language：Japanese   Publishing type：Research paper, summary (national, other academic conference)   Publisher：THE JAPAN SOCIETY OF HYDROLOGY AND WATER RESOURCES  

The seasonal variation of regional surface heat fluxes was estimated by using satellite data. The objected area is the center of Kanto region, which has many kinds of land uses. The bulk transfer method and surface energy balance equation were used to estimate the fluxes. The latent heat flux in paddy fields and grass lands and the sensible heat flux in grass lands and urban areas were well estimated within 30% of mean relative error. The results of seasonal variation show that the order of the sensible and ground heat fluxes had almost same values in paddy fields, and the order of the sensible heat flux in urban areas and grass lands had almost same values. The ground heat flux in urban areas was much larger than that in other land uses.

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Authorship：Corresponding author   Language：Japanese   Publishing type：Research paper, summary (national, other academic conference)   Publisher：THE JAPAN SOCIETY OF HYDROLOGY AND WATER RESOURCES  

Meteorological data at two heights are needed to estimate sensible and latent heat fluxes using the Bowen ratio energy balance and the gradient methods. It is, therefore, very convenient if we can estimate those fluxes with the data only at one height. In this study, a half-order time derivative method which needed the meteorological time series data at one height was investigated. As a result, the method was applicable for estimating the sensible heat flux, but not for the latent heat flux. Furthermore, the latent heat flux estimated as the residual of heat balance equation had reasonable values.

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Language：Japanese   Publisher：土壌物理学会  

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Authorship：Last author   Language：Japanese   Publishing type：Research paper, summary (national, other academic conference)  

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Language：Japanese   Publishing type：Research paper, summary (national, other academic conference)  

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Language：Japanese   Publishing type：Research paper, summary (national, other academic conference)   Publisher：土壌物理学会  

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Authorship：Corresponding author   Language：Japanese   Publishing type：Research paper, summary (national, other academic conference)  

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Authorship：Last author   Language：Japanese  

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Authorship：Lead author   Language：Japanese   Publishing type：Article, review, commentary, editorial, etc. (scientific journal)   Publisher：（社）農業農村工学会  

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Authorship：Corresponding author   Language：Japanese   Publishing type：Research paper, summary (national, other academic conference)   Publisher：農業農村工学会中国四国支部  

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Authorship：Corresponding author   Language：Japanese   Publishing type：Research paper, summary (national, other academic conference)  

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Authorship：Corresponding author   Language：Japanese   Publishing type：Research paper, summary (national, other academic conference)   Publisher：（社）農業農村工学会  

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Authorship：Last author   Language：Japanese   Publishing type：Research paper, summary (national, other academic conference)   Publisher：（社）農業農村工学会  

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Language：English  

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Language：Japanese   Publishing type：Rapid communication, short report, research note, etc. (scientific journal)  

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Authorship：Lead author   Language：Japanese   Publishing type：Research paper, summary (national, other academic conference)  

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Authorship：Lead author   Language：Japanese   Publishing type：Research paper, summary (national, other academic conference)  

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Language：Japanese   Publishing type：Book review, literature introduction, etc.   Publisher：日本地下水学会  

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Language：Japanese   Publishing type：Rapid communication, short report, research note, etc. (bulletin of university, research institution)   Publisher：国際農林水産業研究センター  

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Authorship：Lead author   Language：Japanese  

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Language：Japanese   Publishing type：Research paper, summary (national, other academic conference)   Publisher：農業農村工学会土壌物理研究部会  

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Authorship：Corresponding author   Language：Japanese   Publishing type：Research paper, summary (national, other academic conference)  

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Authorship：Lead author   Language：Japanese   Publishing type：Research paper, summary (national, other academic conference)  

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Language：Japanese   Publishing type：Research paper, summary (national, other academic conference)  

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Authorship：Corresponding author   Language：Japanese   Publishing type：Research paper, summary (national, other academic conference)  

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Language：Japanese   Publisher：京都大学  

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Language：Japanese   Publishing type：Article, review, commentary, editorial, etc. (other)  

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Language：Japanese   Publishing type：Article, review, commentary, editorial, etc. (bulletin of university, research institution)   Publisher：岡山大学保健環境センター環境安全部門  

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Authorship：Corresponding author   Language：Japanese   Publishing type：Research paper, summary (national, other academic conference)  

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Authorship：Corresponding author   Language：Japanese   Publishing type：Research paper, summary (national, other academic conference)  

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Authorship：Last author   Language：Japanese   Publishing type：Research paper, summary (national, other academic conference)  

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Authorship：Corresponding author   Language：Japanese   Publishing type：Research paper, summary (national, other academic conference)  

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Authorship：Last author   Language：Japanese   Publishing type：Research paper, summary (national, other academic conference)  

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Language：Japanese   Publishing type：Research paper, summary (national, other academic conference)   Publisher：システム農学会  

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Language：English   Publishing type：Research paper, summary (international conference)  

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Authorship：Corresponding author   Language：Japanese   Publishing type：Research paper, summary (national, other academic conference)  

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Authorship：Corresponding author   Language：Japanese   Publishing type：Research paper, summary (national, other academic conference)   Publisher：土壌物理学会  

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Authorship：Last author   Language：Japanese   Publishing type：Research paper, summary (national, other academic conference)  

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Authorship：Last author   Language：Japanese   Publishing type：Research paper, summary (national, other academic conference)   Publisher：農業土木学会  

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Authorship：Last author   Language：Japanese   Publishing type：Research paper, summary (national, other academic conference)   Publisher：農業土木学会  

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Authorship：Lead author   Language：Japanese   Publishing type：Research paper, summary (national, other academic conference)  

【企画セッション9】テーマ：土中水分・塩分移動予測汎用プログラムHYDRUSを用いた教育・研究と応用

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Authorship：Lead author   Language：Japanese   Publishing type：Research paper, summary (national, other academic conference)   Publisher：農業土木学会  

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Language：Japanese   Publisher：岡山大学農学部附属山陽圏フィールド科学センター  

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Language：Japanese   Publisher：岡山大学環境計測共同利用施設  

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Authorship：Lead author   Language：Japanese   Publishing type：Research paper, summary (national, other academic conference)  

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Authorship：Last author   Language：Japanese   Publishing type：Research paper, summary (national, other academic conference)  

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Language：Japanese   Publisher：農業土木学会 鳥取県西部地震調査委員会  

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Language：Japanese   Publishing type：Research paper, summary (national, other academic conference)  

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Authorship：Lead author,　Corresponding author   Language：Japanese   Publishing type：Research paper, summary (national, other academic conference)  

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Authorship：Lead author,　Corresponding author   Language：English   Publishing type：Research paper, summary (international conference)  

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Language：Japanese   Publishing type：Research paper, summary (national, other academic conference)  

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Language：Japanese   Publishing type：Research paper, summary (national, other academic conference)  

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Authorship：Lead author   Language：Japanese   Publishing type：Article, review, commentary, editorial, etc. (trade magazine, newspaper, online media)   Publisher：㈱ベネッセコーポレーション  

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Authorship：Lead author,　Corresponding author   Language：Japanese   Publishing type：Research paper, summary (national, other academic conference)  

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Authorship：Lead author,　Corresponding author   Language：Japanese   Publishing type：Research paper, summary (national, other academic conference)  

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Authorship：Lead author   Language：Japanese   Publishing type：Research paper, summary (national, other academic conference)  

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Language：Japanese   Publisher：東北草地研究会  

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Authorship：Lead author   Language：Japanese   Publishing type：Article, review, commentary, editorial, etc. (trade magazine, newspaper, online media)   Publisher：㈱ベネッセコーポレーション  

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Language：Japanese   Publishing type：Research paper, summary (national, other academic conference)  

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Authorship：Lead author   Language：Japanese   Publishing type：Research paper, summary (national, other academic conference)  

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Language：Japanese   Publishing type：Research paper, summary (national, other academic conference)   Publisher：土壌物理学会  

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Language：Japanese   Publishing type：Research paper, summary (national, other academic conference)   Publisher：農業気象学会 中国･四国支部  

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Language：Japanese   Publisher：農業土木学会中国四国支部  

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Language：Japanese   Publishing type：Research paper, summary (national, other academic conference)  

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Authorship：Lead author   Language：Japanese   Publishing type：Research paper, summary (national, other academic conference)  

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Language：Japanese   Publishing type：Article, review, commentary, editorial, etc. (other)   Publisher：農業土木学会スチューデント委員会  

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Language：Japanese   Publishing type：Research paper, summary (international conference)  

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Authorship：Lead author   Language：Japanese   Publishing type：Research paper, summary (international conference)  

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Authorship：Lead author   Language：Japanese   Publishing type：Research paper, summary (national, other academic conference)  

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Authorship：Last author   Language：Japanese   Publishing type：Research paper, summary (national, other academic conference)  

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Authorship：Last author   Language：Japanese   Publishing type：Research paper, summary (national, other academic conference)  

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Authorship：Last author   Language：Japanese   Publishing type：Research paper, summary (national, other academic conference)  

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Authorship：Lead author   Language：Japanese  

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Authorship：Last author   Language：Japanese   Publishing type：Research paper, summary (national, other academic conference)  

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Authorship：Last author   Language：Japanese   Publishing type：Research paper, summary (national, other academic conference)  

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Authorship：Lead author   Language：Japanese   Publishing type：Research paper, summary (national, other academic conference)  

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Language：Japanese   Publisher：独立行政法人防災科学技術研究所  

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Authorship：Last author   Language：Japanese   Publishing type：Research paper, summary (national, other academic conference)  

平成4年度日本草地学会発表会

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Authorship：Last author   Language：Japanese   Publishing type：Research paper, summary (national, other academic conference)  

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Authorship：Lead author   Language：Japanese   Publishing type：Research paper, summary (national, other academic conference)   Publisher：農業土木学会  

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Language：Japanese   Publishing type：Research paper, summary (national, other academic conference)  

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Authorship：Lead author   Language：Japanese   Publishing type：Research paper, summary (national, other academic conference)  

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Language：Japanese   Publishing type：Research paper, summary (national, other academic conference)  

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Authorship：Lead author   Language：Japanese   Publishing type：Research paper, summary (national, other academic conference)   Publisher：日本地下水学会  

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Authorship：Lead author   Language：Japanese   Publishing type：Research paper, summary (national, other academic conference)   Publisher：（社）農業土木学会京都支部  

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Event date： 2018.3.13 - 2018.3.17

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：九州大学伊都キャンパス  

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Event date： 2017.3.27 - 2017.3.30

Language：Japanese  

Venue：北里大学獣医学部（青森県十和田市）  

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Event date： 2016.12.12 - 2016.12.16

Language：English   Presentation type：Poster presentation  

Venue：San Francisco  

A multiple regression model was used to predict the averaged soil water content in root zone instead of solving a Richards' equation numerically, which of applicability was examined. (1) The soil water content of the depth of 5cm (model I) or (2) the effective rainfall and evapotranspiration (model II) were used as the explanatory variables of the multiple regression model. As a result, it became clear that both models could predict the averaged soil water content in the root zone. In addition, it was necessary to convert the original data to its difference and to apply them to the multiple regression model because it was judged that the decrease of the autocorrelation coefficient for the time series data of soil water contents was slow, and therefore, the explanatory variables were correlated each other.

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Event date： 2015.12.14 - 2015.12.18

Language：English   Presentation type：Poster presentation  

Venue：San Francisco  

A deicing agent has been sprinkled on an expressway to prevent it from freezing in the hilly and mountainous area along the expressway having been used for more than 30 years. We investigated the infiltration, the river runoff, and the scattering of the de-icing agent quantitatively, observed the variation of water quality in river, and discussed the infiltration route and balance of the deicing agent in order to clarify the influence of the de-icing agent on the groundwater salinization. As a result, it turned out that 65% of the de-icing agent sprinkled on the road surface flowed into the waterway, the 25% infiltrated into underground through the crack of a road surface, and the remaining 10% dispersed out of an expressway. Next, for the rate of the de-icing agent outflowing to the river during a frozen snow term, it was estimated that the 39% of the sprinkled de-icing agent outflowed with surface water, and the 17% did with groundwater. Moreover, it was shown clearly that the 44% was probably stored in underground from the balance between the sprinkled de-icing agent and the outflowing one. In addition, the Cl- concentration of groundwater by the infiltrated deicing agent was simulated to clarify its extent and to predict its change in future when stopped sprinkling the deicing agent.

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Event date： 2014.12.14 - 2014.12.18

Language：English   Presentation type：Poster presentation  

Venue：San Francisco  

The recent global warming affects the evapotranspiration which is an important factor of hydrologic cycle and water resources management. Many of the previous studies have reported the decreasing trends of pan evaporation in the area of the continental climate of the middle latitude. However, few studies in the region in a high latitude area such as Finland haven't been carried out so far. The purpose of this study is to investigate the long term variations of pan evaporation in Finland located in high latitude using a trend analysis. The causes of the trends of pan evaporation were discussed from two points of view: a complementary relationship and Penman's equation (1948). The results were summarized as follows: (1) The variations of pan evaporation showed decreasing trends at 5 stations and increasing ones at 2 stations. (2) The mechanistic causes for the decreasing trends at 5 stations were mainly the increases of precipitation and the aerodynamic term in Penman's equation. (3) The mechanistic causes for the increasing trends at 2 stations couldn't be revealed.
H. L. Penman. 1948. Natural evaporation from open water, bare soil and grass, Proceedings of the Royal Society of London, Series A, Mathematical and Physical Science, 193, 1032, 129-145.

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Event date： 2012.12.3 - 2012.12.7

Language：English   Presentation type：Poster presentation  

Venue：San Francisco  

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Event date： 2010.12.13 - 2010.12.17

Language：English   Presentation type：Poster presentation  

Venue：San Francisco  

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Event date： 2008.3

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Event date： 2006.12.11 - 2006.12.15

Language：English   Presentation type：Poster presentation  

Venue：San Francisco  

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Language：Japanese   Presentation type：Oral presentation (general)  

Venue：名古屋国際会議場  

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Language：Japanese   Presentation type：Public lecture, seminar, tutorial, course, or other speech  

Venue：岡山大学創立50周年記念館  

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Language：Japanese   Presentation type：Public lecture, seminar, tutorial, course, or other speech  

Venue：科学技術館・地下サイエンスホール  

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Language：Japanese   Presentation type：Symposium, workshop panel (nominated)  

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Language：English   Presentation type：Oral presentation (general)  

Venue：San Francisco, CA  

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Language：English   Presentation type：Oral presentation (general)  

Venue：金沢市  

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Type：Lecture

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Audience： General

Type：Lecture

2006年度 岡山大学環境理工学部公開講座「安全で自然と共生した地域環境の創造」：天水農業地帯の水資源利用 ー東北タイを事例としてー

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Type：Other

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