DEM地形分析在山区地质灾害研究中的应用——以云南省漾濞县为例

云南省漾濞县具有典型的山地特点,每年其境内发生的地质灾害都给人民生命和财产造成了极大的损失。在漾濞县的地质灾害调查中,通过"3S"技术的应用,建立了漾濞县的数字高程模型,进行了基于ArcGIS的地形分析,提取出了坡度和坡向等重要的地形因子。通过研究发现:坡度是漾濞县地质灾害频发的最主要控制因素,漾濞江及其支流上游的滑坡和崩塌为泥石流的发生提供了物源基础;同时阳坡是地质灾害发生的主要坡向,滑坡和崩塌等灾害发生频繁。最后,制作了漾濞县坡度、坡向分析图,指出了漾濞县较易发生地质灾害的地区,为其他山地地区地质灾害研究提供了一种借鉴模式。

APPLICATION OF DEM TERRAIN ANALYSIS IN THE YANGBI COUNTY'S GEOLOGICAL HAZARDS

Yangbi County, Yunnan Province, has a typical mountain features. Each of years, geological disasters have given people＇s lives and property caused great losses. Yangbi County in geological hazard survey, by ＂3S＂ technology, established Yangbi County digital elevation model for terrain analysis based on Arcgis, extract the slope and aspect of terrain and other important factors. The study found： slope is the most important controlling factors of in Yangbi＇s geological hazards, Yangbi Jiang and its tributaries upstream of the landslide and collapse for the occurrence of debris flow source to provide a foundation; while sunny slope is the main aspect of geological disaster, disasters such as landslides and collapses occur frequently. Finally, produced Yangbi county＇s analysis map of slope and aspect, pointed out the prone areas for Yangbi County＇s geological disaster, at the same time for other mountain regions to provide a reference model.