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Importance of considering nutrient loadings from small watersheds to a lake-A case study of the Lake Shinji watershed,Shimane Prefecture,Japan

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International Journal of Agricultural and Biological Engineering 2018年第5期11卷 124-130页

作者： hiroaki somura Hidenobu Kunii Yasumichi Yone Ikuo Takeda Hirokazu Sato Graduate School of Environmental and Life Science Okayama UniversityOkayama 7008530Japan Estuary Research Center Shimane UniversityMatsue 6908504Japan Faculty of Life and Environmental Science Shimane UniversityMatsue 6908504Japan

Nutrient loadings from upstream watersheds can have significant impacts on the water quality of receiving water ***,a major river is selected as the target for water quality studies,and the impact of minor rivers tends to be *** is very important to evaluate whether the impact of small rivers on the downstream water quality is *** water sampling and discharge modeling using SWAT were used to analyze the contribution of small rivers to water quality in a receiving *** this analysis,it was determined that the inflowing total nitrogen(TN)and total phosphorus(TP)concentrations from all target rivers exceeded the lake water environmental standards set by the Ministry of the *** contribution of suspended sediment(SS)and TN loads from small rivers did not vary markedly compared with their relative discharge contributions to the lake,at approximately 20%.However,the impact on TP loads to the lake from small rivers was 9.1%higher than their relative flow contributions,accounting for 28.2% of the TP ***,there is a potential to underestimate the impact of ungauged small rivers if only the major river is selected to evaluate the downstream lake water quality.

关键词： suspended sediment(SS) total nitrogen(TN) total phosphorus(TP) watershed management SWAT model

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MODEL DEVELOPMENT FOR SUPPLEMENTARY WATER ESTIMATION IN THE LOWER MEKONG BASIN

MODEL DEVELOPMENT FOR SUPPLEMENTARY WATER ESTIMATION IN THE ...

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第19届国际灌排大会

作者： hiroaki somura Koshi YOSHIDA Katsuhiko HIGUCHI Osamu TODA Hajime TANJI Faculty of Life and Environmental Science Department of Regional Development Shimane University River and Coast Laboratory National Institute for Rural Engineering Japan River and Coast Laboratory National Institute for Rural Engineering Japan Graduate School of Agricultural and Life Sciences University of Tokyo Japan River and Coast Laboratory National Institute for Rural Engineering Japan

＜正＞Supplementary water needs to be estimated even in areas where data is scarce because of the importance of proper water management. The Mekong River, particularly the lower part （Lower Mekong River Basin）, is one area where supplementary water has not been well researched despite the fact that this international river runs through four countries: Laos, Thailand, Cambodia and Vietnam. Studies to grasp the quantum of supplementary water are limited due to a lack of hydrological data, and therefore methods for knowing these modules are needed. One solution is model simulations. In this study, supplementary water was estimated by working backwards from rice production targeted at a macro scale. The supplementary water during rainy season in three countries was estimated in 1988 through model calibration with rice production. On the other hand, rice production of Northeast Thailand during dry season could not be represented well, the supplementary water in this country could not be estimated though the supplementary water in other countries, Cambodia and Laos, could be possible in this model simulation. Reconsideration of model structures and other factors such as fertilizer and sunshine has to be made to improve this problem.

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Simulation of rice paddy systems in SWAT:A review of previous applications and proposed SWAT+rice paddy module

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International Journal of Agricultural and Biological Engineering 2022年第1期15卷 1-24页

作者： Philip W.Gassman Jaehak Jeong Julien Boulange Balaji Narasimhan Tasuku Kato hiroaki somura Hirozumi Watanabe Sadao Eguchi Yuanlai Cui Atsushi Sakaguchi Le Hoang Tu Rui Jiang Min-Kyeong Kim Jeffrey G.Arnold Wei Ouyang Center for Agricultural and Rural Development Iowa State UniversityAmesIowa 50011-1070USA Blackland Research&Extension Center Texas A&M AgriLifeTempleTexas 76502USA Department of International Environmental and Agricultural Sciences Tokyo University of Agriculture and TechnologyFuchuTokyo 183-8509Japan Department of Civil Engineering Indian Institute of Technology MadrasChennai 600036India Graduate School of Environmental and Life Science Faculty of EngineeringOkayama UniversityOkayama 700-8530Japan Institute for Agro-Environmental Sciences National Agriculture and Food Research OrganizationTsukuba 305-8604Japan State Key Laboratory of Water Resources and Hydropower Engineering Science Wuhan UniversityWuhan 430072China Department of Biological&Environmental Sciences Faculty of AgricultureYamaguchi UniversityYamaguchi 753-8515Japan Key Laboratory of Plant Nutrition and the Agri-environment in Northwest China Ministry of AgricultureCollege of Natural Resources and EnvironmentNorthwest A&F UniversityYangling 712100ShaanxiChina Rural Development Administration Jeonju54875Republic of Korea Grassland Soil and Water Research Laboratory U.S.Department of Agriculture-Agricultural Research ServiceTempleTexas 76502USA School of Environment State Key Laboratory of Water Environment SimulationBeijing Normal UniversityBeijing 100875China

The Soil and Water Assessment Tool(SWAT)is an ecohydrological watershed-scale model which was initially developed in the early 1990s to simulate the impacts of land use,management systems,and climate on hydrology and/or water *** adopted in the U.S.,the use of the model then spread to Europe and then later to Asia and other *** range of applications that SWAT has been applied to have also expanded dramatically,which influenced ongoing model development which has been virtually continuous over the past two decades.A key component of many SWAT applications in Asia is accounting for rice paddy production that is common in some subregions within the ***,most of these studies do not provide explicit details of how rice production was simulated in *** research has revealed that significant problems occur when trying to represent rice paddy systems in standard versions of SWAT,due to limitations in algorithms based on the runoff curve number approach or the pothole *** response,key modifications have been made to SWAT in recent studies that have resulted in more accurate representation of rice paddy *** developments point to the need for the incorporation of an enhanced rice paddy module within SWAT to better capture rice paddy hydrological and pollutant dynamics,which would support improved use of the model in Asia and other rice production *** related to simulating rice production in SWAT are discussed as follows:1)an overview of global rice production;2)history of SWAT development;3)typical approaches for simulating rice production;4)problems associated with the typical approaches;5)recent code modifications to address deficiencies in replicating rice paddy systems;6)recommendations for developing a standard rice paddy module for future SWAT codes.

关键词： SWAT rice paddies potholes hydrology pollutants modified SWAT models

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