Journal
JOURNAL OF HYDROLOGY-REGIONAL STUDIES
Volume 3, Issue -, Pages 285-311Publisher
ELSEVIER
DOI: 10.1016/j.ejrh.2014.09.003
Keywords
Brahmaputra; Freshwater availability; SWAT; Streamflow; Climate change; Land use change
Categories
Funding
- U.S. Agency for International Development Famine Early Warning Systems Network agreement
- U.S. Geological Survey
- Geospatial Sciences Center of Excellence at South Dakota State University
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Study Region: Brahmaputra River basin in South Asia. Study Focus: The Soil and Water Assessment Tool was used to evaluate sensitivities and patterns in freshwater availability due to projected climate and land use changes in the Brahmaputra basin. The daily observed discharge at Bahadurabad station in Bangladesh was used to calibrate and validate the model and analyze uncertainties with a sequential uncertainty fitting algorithm. The sensitivities and impacts of projected climate and land use changes on basin hydrological components were simulated for the A1B and A2 scenarios and analyzed relative to a baseline scenario of 1988-2004. New hydrological insights for the region: Basin average annual ET was found to be sensitive to changes in CO2 concentration and temperature, while total water yield, streamflow, and groundwater recharge were sensitive to changes in precipitation. The basin hydrological components were predicted to increase with seasonal variability in response to climate and land use change scenarios. Strong increasing trends were predicted for total water yield, streamflow, and groundwater recharge, indicating exacerbation of flooding potential during August-October, but strong decreasing trends were predicted, indicating exacerbation of drought potential during May-July of the 21st century. The model has potential
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