The Runoff Simulation Of Swat Model In The Shibi Reservoir Watershed Based On The Measured Soil Properties Database

SWAT (Soil and Water Assessment Tool) is one of the important models which are widely used in the study of LUCC hydrological effects. The study of the SWAT model application has been in-depth at a certain level in China, but because of the differentiation of Chinese and American soil classification system, the way of using mathematical methods to establish the soil properties based on our existing soil survey data has become a constraint for wider use of SWAT.Taken the Shibi reservoir watershed as research object, this paper investigated the application of the measured soil properties database in SWAT model runoff simulation. The model was established on the basic of remote sensing images of Shibi reservoir in Nanan in 1989,2002 and 2008,the measured soil properties database, and the 1998-2002 meteorological and hydrological observation data.The model's calibration was measured with the adoption of runoff data from 1998 to 2002, and the parameters of the study area were determined. Then the model was further validated with the runoff of 2003-2007. The results showed that the SWAT model was applicable in the Shibi reservoir watershed.Finally, the model was used to simulate the land cover scenarios of the Shibi reservoir watershed. It showed that in the same climatic conditions, Shibi reservoir watershed runoff order was:2002> 2008> 1998. Then 4 kinds of land-use scenarios were established to research different land use's effect on watershed runoff. The results showed that the Shibi reservoir watershed runoff had been decreasing with the increase of forest coverage, which displayed specifically as follows:mining land> Urban Land> land> forestland. Through this study, the scientific foundation that put forward reasonable arrangements for the Shibi reservoir watershed land use configuration could be provided.