基于GIS的流域土壤侵蚀量估算指标模型方法——以嘉陵江上游西汉水流域为例

Categorical Model of Estimating Soil Erosion Based on GIS ——A Case Study in Xihanshui Watershed

在分析土壤侵蚀形成的各主要影响因子的基础上 ,提出了基于栅格地理信息系统的流域土壤侵蚀量估算的指标模型。结合嘉陵江上游西汉水流域具体情况 ,以降雨、地形、沟谷密度、植被盖度、成土母质等为主要指标 ,对流域土壤侵蚀量进行了估算 。

Based on factor analysis of soil erosion, a categorical model of estimating soil erosion based on GIS has been proposed. The key to this model is to set up the relationship between soil erosion and driven factors, such as rainfall, terrain, cleuch density, percentage of vegetation coverage, soil texture and so on. It so happened that Geographical Information Systems provide the functions to manage manipulate those datasets. Case study of Xihanshui watershed showed that the categorical model based on GIS has the advantage of quantitative estimation of soil erosion,can be used to monitor soil erosion dynamically.