湖北省谷城县地质灾害易发程度分区评价

通过实地调查,认为谷城县地质灾害主要为滑坡和不稳定斜坡,其发育与地形地貌、地层岩性、地质构造和人类工程活动、大气降雨关系密切。依据地质灾害发育现状和规律、致灾因子,利用GIS信息系统空间分析方法,对各因子进行属性叠加统计分析,对谷城县地质灾害易发程度进行了分区评价,指出盛康、赵湾和五山等乡镇人类工程活动密集区是地质灾害的高易发区。

Assessment of Probable Occurrence Level of Geological Hazard Subdistrict in Gucheng County, Hubei Province

Gucheng County of Hubei Province, China is located in southern foot of Qinling Mountain and on the side of Hanshui River. According to plenty of field surveys, it is suggested in this paper that landslide and un-stable slope are the major types of geological hazard occurred in Gucheng. The occurring condition of geological hazard is closely related to landforms and topography, the property of rock and soil, geological structure, human activities and rainfall, etc. On the other hand, the subdistrict assessment for occurrence level of geological hazard in Gucheng area was made in the paper. The major procedure of the evaluation method is as follows: firstly the lead-hazard factors were summarized based on analyzing the developmental feature and regulation of geological hazard; and then all lead-hazard factors were stack-analyzed by statistics method and the spatial analysis of GIS technology. The result shows that the high occurrence level of geological hazard mainly distributes in such areas that there are frequent human activity, as Shengkang town, Zhawan town and Wushan town.