| A GIS-BASED DISTRIBUTED SOIL EROSION MODEL： A CASE STUDY OF TYPICAL WATERSHED, SICHUAN BASIN |
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| 作者姓名： | Zaijian YUAN Qiangguo CAI Yingmin CHU |
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| 作者单位： | [1]Lecturer, School of Economics ＆ Management, Hebei University of Science ＆ Technology, Shijiazhuang, 050018, China [2]Prof., Key Laboratory of Water Cycle ＆ Related Land Surface Processes, Institute of Geographical Sciences and Natural Resources Research, CAS, Beijing, 100101, China [3]Lecturer, College of Tourism, Hebei University of Economics ＆ Business, Shijiazhuang, 050061, China |
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| 基金项目： | 河北科技大学校基金，国家自然科学基金，中国科学院知识创新工程项目 |
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| 摘 要： | Based on the measuring data and Digital Elevation Data (DEM) in a typical watershed--Hemingguan Watershed, Nanbu County, Sichuan Province of China, a GIS-based distributed soil erosion model was developed particularly for the purple soil type. It takes 20 m × 20 m grid as calculating unit and operates at 10-minute time interval. The required input data to the model include DEM, soil, land use, and time-series of precipitation and evaporation loss. The model enables one to estimate runoff, erosion and sediment yield for each grid cell and route the flow along its flow path to the watershed outlet. Furthermore, the model is capable of calculating the total runoff; erosion and sediment yield for the entire watershed by recursion algorithm. The validation of the model demonstrated that it could quantitatively simulate the spatial distribution of hydrological variables in a watershed, such as runoff, vegetation entrapment, soil erosion, the degree of soil and water loss. Moreover, it can evaluate the effect of land use change on the runoff generation and soil erosion with an accuracy of 80% and 75% respectively. The application of this model to a neighboring watershed with similar conditions indicates that this distributed model could be extended to other similar regions in China.
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| 关 键 词： | 四川盆地 土壤侵蚀 分布式分水岭模型 地理信息系统 紫色土 土地利用变化 |
| 修稿时间： | 2006-022007-09 |
A GIS-BASED DISTRIBUTED SOIL EROSION MODEL:A CASE STUDY OF TYPICAL WATERSHED, SICHUAN BASIN |
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| Zaijian YUAN Qiangguo CAI Yingmin CHU.A GIS-BASED DISTRIBUTED SOIL EROSION MODEL:A CASE STUDY OF TYPICAL WATERSHED, SICHUAN BASIN[J].International Journal of Sediment Research,2007,22(2):120-130. |
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| Authors: | Zaijian YUAN Qiangguo CAI Yingmin CHU |
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| Abstract: | Based on the measuring data and Digital Elevation Data (DEM) in a typical watershed--Hemingguan Watershed, Nanbu County, Sichuan Province of China, a GIS-based distributed soil erosion model was developed particularly for the purple soil type. It takes 20 m × 20 m grid as calculating unit and operates at 10-minute time interval. The required input data to the model include DEM, soil, land use, and time-series of precipitation and evaporation loss. The model enables one to estimate runoff, erosion and sediment yield for each grid cell and route the flow along its flow path to the watershed outlet. Furthermore, the model is capable of calculating the total runoff; erosion and sediment yield for the entire watershed by recursion algorithm. The validation of the model demonstrated that it could quantitatively simulate the spatial distribution of hydrological variables in a watershed, such as runoff, vegetation entrapment, soil erosion, the degree of soil and water loss. Moreover, it can evaluate the effect of land use change on the runoff generation and soil erosion with an accuracy of 80% and 75% respectively. The application of this model to a neighboring watershed with similar conditions indicates that this distributed model could be extended to other similar regions in China. |
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| Keywords: | Purple soil Soil erosion model Distributed watershed model Land use change |
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