基于GIS的区域土壤侵蚀模型设计

区域土壤侵蚀模型是国家和区域土壤侵蚀调查、水土保持宏观规划的支持工具。借鉴国外区域土壤侵蚀模型,以DEM栅格为空间单元,对区域土壤侵蚀的单元模型进行定量表达,包括降雨、植被截留、入渗,微地形填洼等,并利用GIS功能完成径流传递和汇集部分的计算,建立了区域土壤侵蚀模型。所建立模型在延河流域的试运算,结果接近现实,能反映土壤侵蚀时空分布趋势。模型的建立可为水土保持的宏观决策提供支持。

Regional soil erosion model is a effective tool for regional soil erosion survey and policy-making of water and soil conservation.This thesis attempts to develop regional soil erosion model,according to the oversea regional soil erosion model,the study region was divided into regular cells based on DEM.The sub-process of interception,infiltration,surface storage were quantitatively described.Transportation and Accumulation of runoff among units was calculated by means of spatial analytic function of GIS.Acc...