Water Balance of the SWAT Model and Its Application in the Suomo Basin

SWAT model is a distributed hydrological model,which was based on GIS. It got frequent development and application in recent years. SWAT model was developed to simulate varying hydro physical processes including water, sediment and agricultural chemical yields in large complex watersheds. The water balance of the SWAT model was expatiated and it was applied to simulate the rainfall runoff relationship in the Suomo Basin in order to reveal the impact of climate fluctuation and land cover changes on hydrology. The result was that, from the 1960s to the 1990s, 1/5 runoff change was caused by land cover change and 3/5～4/5 runoff change was caused by climate fluctuation.