SWAT modle physically based is the acronym for Soil and Water Assessment Tool,developed by the USDA.By using GIS and RS,SWAT was developed to predict the impact of land management practices on water,sediment and agricultural chemical yields in large complex watersheds with varying soils,land use and management conditions in the long-term.The SWAT model enables users to study long-term impacts.The principle,structure,appliance and assessment of SWAT are presented in order to offer reference for our country s...
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