20 April 2010 Spatial variation of water and soil erosion in Donghe basin based on SWAT model
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Abstract
The Donghe basin is one of the typical regions with serious water and soil erosion in Kaixian county of Chongqing city. In this study the spatial distribution variation of water and soil erosion in Donghe basin is analyzed based on a comprehensive method that integrates SWAT model with a Geographic Information System and remote sensing technology. SWAT is a physical based model that requires specific information about weather, soil properties, topography, vegetation, and land management practices occurring within the watershed. Firstly, with the Donghe basin as a study area, using the spatially distributed and mechanism-based SWAT model, the distributed hydrological and sediment model are developed to simulate the runoff and sediment production of Donghe basin. Then the model is calibrated and validated against observed runoff and sediment data from 2003 to 2004, the validated result shows a deterministic coefficient of 0.93. Finally the spatial distribution of the water and soil erosion of Donghe is analyzed. The results show that the mean sediment production of Donghe basin is 30.7 t/ha•a, the maximum sediment production of its sub-watersheds is 212.7 t/ha•a, and the minimum is 0.3 t/ha•a. There is an obviously clustering feature of sub-watersheds distribution with different sediment production level. The area of the high erosion, strong erosion and violent erosion account for 30% of the whole basin area, the other soil erosion area occupy 70%.
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Aixia Liu, Aixia Liu, Junfeng Chen, Junfeng Chen, Jing Wang, Jing Wang, Zhengjun Liu, Zhengjun Liu, } "Spatial variation of water and soil erosion in Donghe basin based on SWAT model", Proc. SPIE 7676, Sensing for Agriculture and Food Quality and Safety II, 76760S (20 April 2010); doi: 10.1117/12.849777; https://doi.org/10.1117/12.849777
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