基于地形地貌的区域地质灾害孕灾条件分析

Disaster-pregnancy Conditions for Regional Geological Disasters Based on Topography

通过分析资料、野外调查,基于ArcGIS平台,利用DEM数据分别对地貌、斜坡坡度、斜坡高度及斜坡坡形这四者与地质灾害的关系进行分析研究。结果表明,30°~70°斜坡地段滑坡灾害较为发育,50°~90°斜坡地段崩塌灾害较为发育;从斜坡高度来看,滑坡主要发生在坡高10~40 m的斜坡地段,崩塌则主要发生坡高0~50 m的斜坡地段;在斜坡剖面形态为直线形的斜坡地段,崩塌和滑坡灾害较为发育。

This paper analyzed the relationship between geomorphology,ramp slope,slope height and slope shape and geological hazards based on ArcGIS platform and DEM data through analysis of data and field investigation.The results show that landslide disasters are more developed in the slope section with a slope gradient of 30°-70°,and collapse disasters are more developed within a slope gradient of 50°-90°;from the perspective of slope height,landslides mainly occur on slopes with a slope height of 10-40 m,the collapse mainly occurs in the slope section with a slope height of 0-50 m;the collapse and landslide disasters are more developed in the slope section with a"straight"slope profile.