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	Provedor de dados AgEcon (3) Autor Gu, Roy (3) Jha, Manoj K. (3) Arnold, Jeffrey G. (2) Gassman, Philip W. (2) Pan, Zaitao (1) Secchi, Silvia (1) Takle, Eugene S. (1) Mais... Palavra-chave Climate change (2) Environmental Economics and Policy (2) SWAT (2) AVSWAT (1) Flow (1) Hydrological modeling (1) Hydrology (1) Modeling of sediment yield (1) RCM (1) Resource /Energy Economics and Policy (1) Simulation (1) Soil and Water Assessment Tool (1) Spatial patterns (1) Threshold subwatershed size (1) Uncertainty analysis (1) Upper Mississippi River Basin (1) Watershed (1) Watershed subdivision (1) Mais... Tipo do documento Working or Discussion Paper (3) Ano 2004 (1) 2003 (1) 2002 (1) País United States (3) Idioma Inglês (3)		Ordenar por:  Relevância Autor Título Ano Registros recuperados: 3 Primeira ... 1 ... Última THE IMPACTS OF CLIMATE CHANGE ON STREAM FLOW IN THE UPPER MISSISSIPPI RIVER BASIN: A REGIONAL CLIMATE MODEL PERSPECTIVE AgEcon Jha, Manoj K.; Pan, Zaitao; Takle, Eugene S.; Gu, Roy. We evaluate the impact of climate change on stream flow in the Upper Mississippi River Basin (UMRB) by using a regional climate model (RCM) coupled with a hydrologic model, the Soil and Water Assessment Tool (SWAT). The SWAT model was calibrated and validated against measured stream flow data using observed weather data and inputs from the Environmental Protection Agency's BASINS (Better Assessment Science Integrating Point and Nonpoint Sources) geographical information/database system. The combined performance of the SWAT and RCM was examined using observed weather data as a lateral boundary condition in the RCM. The SWAT and RCM were found to perform well, especially on an annual basis. The potential impacts of climate change on water yield and other... Tipo: Working or Discussion Paper Palavras-chave: Climate change; Hydrological modeling; RCM; SWAT; Uncertainty analysis; Upper Mississippi River Basin; Environmental Economics and Policy. Ano: 2003 URL: http://purl.umn.edu/18403 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 Registros recuperados: 3 Primeira ... 1 ... Última

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