基于GIS的黄河中游河龙区间流域──重力侵蚀相对强度空间分布

GIS Supported Study on Gravitational Erosion Distribution──Case of the Catchments of the Middle Reacg if Yellow River

在对黄土高原地区重力侵蚀及其影响因子深入分析的基础上 ,扩展了水土流失研究中已有的“地理侵蚀面”的概念 ,提出了黄土高原地区重力侵蚀相对强度的估算式 ,并在地理信息系统的支持下 ,应用最小图斑编码方法 。

This paper analyses the gravitational erosion processes and the relevant controlling factors, extends the existing concept of ”geographical erosion flat” prevailed in soil erosion studies, develops a formula for calculating relative gravitational erosion intensity in the study area. The authors apply minimum polygon and geo coding solution supported by GIS in connection with the formula to investigate the spatial distribution of gravitational erosion in the catchments of the middle reach of Yellow River. As results, several maps are obtained, which seem to agree with the general understandings qualitatively.