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	Provedor de dados AgEcon (4) Autor Arnold, Jeffrey G. (4) Gassman, Philip W. (4) Jha, Manoj K. (3) Gu, Roy (2) Green, Colleen H. (1) Reyes, Manuel R. (1) Secchi, Silvia (1) Mais... Palavra-chave Resource /Energy Economics and Policy (3) SWAT (3) AVSWAT (1) Calibration (1) Climate change (1) Developmental history (1) Environmental Economics and Policy (1) Flow (1) Flow analysis (1) Hydrology (1) Management practices (1) Modeling (1) Modeling of sediment yield (1) Raccoon River Watershed (1) Simulation (1) Soil and Water Assessment Tool (1) Spatial patterns (1) Threshold subwatershed size (1) Water quality (1) Watershed (1) Mais... Tipo do documento Working or Discussion Paper (4) Ano 2007 (1) 2006 (1) 2004 (1) 2002 (1) País United States (4) Idioma Inglês (4)		Ordenar por:  Relevância Autor Título Ano Registros recuperados: 4 Primeira ... 1 ... Última The Soil and Water Assessment Tool: Historical Development, Applications, and Future Research Directions AgEcon Gassman, Philip W.; Reyes, Manuel R.; Green, Colleen H.; Arnold, Jeffrey G.. The Soil and Water Assessment Tool (SWAT) model is a continuation of nearly 30 years of modeling efforts conducted by the U.S. Department of Agriculture (USDA), Agricultural Research Service. SWAT has gained international acceptance as a robust interdisciplinary watershed modeling tool, as evidenced by international SWAT conferences, hundreds of SWAT-related papers presented at numerous scientific meetings, and dozens of articles published in peer-reviewed journals. The model has also been adopted as part of the U.S. Environmental Protection Agency's BASINS (Better Assessment Science Integrating Point & Nonpoint Sources) software package and is being used by many U.S. federal and state agencies, including the USDA within the Conservation Effects... Tipo: Working or Discussion Paper Palavras-chave: Developmental history; Flow analysis; Modeling; SWAT; Water quality; Resource /Energy Economics and Policy. Ano: 2007 URL: http://purl.umn.edu/10285 CLIMATE CHANGE SENSITIVITY ASSESSMENT ON UPPER MISSISSIPPI RIVER BASIN STREAMFLOWS USING SWAT AgEcon Jha, Manoj K.; Arnold, Jeffrey G.; Gassman, Philip W.; Gu, Roy. The Soil and Water Assessment Tool (SWAT) model was used to assess the impacts of potential future climate change on the hydrology of the Upper Mississippi River Basin (UMRB). Calibration and validation of SWAT were performed on a monthly basis for 1968-87 and 1988-97, respectively; R2 and Nash-Sutcliffe simulation efficiency (E) values computed for the monthly comparisons were 0.74 and 0.65 for the calibration period and 0.81 and 0.75 for the validation period. The impacts of eight 20-year (1971-90) scenarios were then analyzed, relative to a scenario baseline. A doubling of atmospheric CO2 concentrations was predicted to result in an average annual flow increase of 35 percent. An average annual flow decrease of 15 percent was estimated for a constant... Tipo: Working or Discussion Paper Palavras-chave: Climate change; Flow; Hydrology; Simulation; Spatial patterns; Watershed; Environmental Economics and Policy. Ano: 2004 URL: http://purl.umn.edu/18419 IMPACT OF WATERSHED SUBDIVISION LEVEL ON FLOWS, SEDIMENT LOADS, AND NUTRIENT LOSSES PREDICTED BY SWAT AgEcon Jha, Manoj K.; Gassman, Philip W.; Secchi, Silvia; Gu, Roy; Arnold, Jeffrey G.. The size, scale, and number of subwatersheds can affect a watershed modeling process and subsequent results. The objective of this study was to determine the appropriate level of subwatershed division for simulating sediment yield. The Soil and Water Assessment Tool (SWAT) model with a geographic information system interface (AVSWAT) was applied to four Iowa watersheds that varied greatly in drainage area. Annual output was analyzed from each simulation, which was executed for 30 years using climatic data representing the 1970 to 2000 period. The optimal threshold subwatershed size of the total drainage area to adequately predict sediment yield was found to be around 3 percent. Decreasing the size of subwatersheds beyond this level does not significantly... Tipo: Working or Discussion Paper Palavras-chave: AVSWAT; Modeling of sediment yield; SWAT; Soil and Water Assessment Tool; Threshold subwatershed size; Watershed subdivision; Resource /Energy Economics and Policy. Ano: 2002 URL: http://purl.umn.edu/18487 Water Quality Modeling for the Raccoon River Watershed Using SWAT AgEcon Jha, Manoj K.; Arnold, Jeffrey G.; Gassman, Philip W.. The Raccoon River Watershed (RRW) in West-Central Iowa has been recognized as exporting some of the highest nitrate-nitrogen loadings in the United States and is a major source of sediment and other nutrient loadings. An integrated modeling framework has been constructed for the RRW that consists of the Soil and Water Assessment Tool (SWAT) model, the interactive SWAT (i_SWAT) software package, Load Estimator (LOADEST) computer program, and other supporting software and databases. The simulation framework includes detailed land use and management data such as different crop rotations and an array of nutrient and tillage management schemes, derived from the U.S. Department of Agriculture's National Resources Inventory databases and other sources. This paper... Tipo: Working or Discussion Paper Palavras-chave: Calibration; Management practices; Raccoon River Watershed; SWAT; Resource /Energy Economics and Policy. Ano: 2006 URL: http://purl.umn.edu/18455 Registros recuperados: 4 Primeira ... 1 ... Última

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