地形因素与地质灾害分布相关性分析

基于河北省1∶5万地质灾害调查成果,选取具有代表性的崩塌、滑坡、泥石流地质灾害隐患3570处,采用图表统计分析法,对分布高程、坡度、汇水面积等地形因素进行分析,研究地形地势因素对河北省地质灾害的空间分布的影响,从而为各级行政主管部门对地质灾害的规划、预防提供参考。受制于人类居住环境等因素,河北省地质灾害在海拔高程、坡度、沟床比降等方面并非理论上的正相关性,而是呈抛物线型分布,其主要分布于海拔200~700 m的中低山区,崩塌发育坡度多大于60°,滑坡发育坡度多在20°~50°,泥石流汇水面积大多小于5 km 2,沟谷形态以V型谷为主,在山坡坡度大于25°,高差100~500 m,沟床比降213~105‰的区域集中分布。

Analysis of Correlation between Topographic Factors and Distribution of Geological Hazards

Based on the results of the 1∶50,000 geological disaster investigation in Hebei Province,this paper selects 3570 hidden dangers of collapse,landslide and debris flow geological disasters,and uses statistical analysis charts to analyze the topographic factors such as distribution elevation,slope and catchment area.Study the influence of topographical factors on the spatial distribution of geological disasters in Hebei Province,and provide reference for the planning and prevention of geological disasters by administrative departments at all levels.Due to the limitation of human living environment,the geological hazards has a parabolic distribution with the elevation,slope and groove bed,the geological disasters of the collapse and slipstream in Hebei Province are mainly distributed in the middle and low mountainous areas with an altitude of 200~700 m.The slope of the collapse development is more than 60°,the slope of the landslide development is 20~40°,and the area of the debris flow is mostly less than 5 km 2.The V-type valley is mainly distributed in the slope of the slope of more than 25°,the height difference is 100~500 m,and the area of the groove bed is 213~105‰.