小流域坡沟系统分类与山地灾害危险性区划研究

Study on Classification and Mountain Geological Hazard Mapping of Slope-gully System in Small Watershed

广东省山地分布广泛,地质条件复杂,构造运动剧烈,是山地灾害严重地区之一,山地灾害严重影响山区经济发展。选取了广东省程江流域中游的小流域作为案例区域,运用GIS技术,将小流域分成若干个坡沟系统,对每个坡沟系统的地质环境条件和土地利用条件进行逐一调查和综合分析,将坡沟系统分冲击力强的泥石流坡沟系统、泥石流坡沟系统、高含沙山洪坡沟系统和一般坡沟系统,根据分类结果进行山地灾害的危险性分区,分为高危险区、较高危险区、中危险区和低危险区。

There are widespread mountains in Guangdong province with complex geological conditions and strenuous structural movement, which is one of serious mountain disasters, and mountain disasters had a bad effect on the economical development in mountain area. A small watershed in Cheng Jiang River Basin was taken as an example, the watershed was divided into some slop-gully system cells based on GIS. Then the cells were classified into four class including the strong impact debris flow cell, debris flow slop-gully system, high sandy system and the general system according the geological conditions and land use condition. Finally, the area was mapped into four region as follows, highrisk region, the more dangerous region, dangerous area and low-risk zone.