基于GIS的龙桥镇地质灾害易发分区评价

GIS-based division and evaluation of the geo-hazard-prone zones in Longqiao Town

本文结合地质灾害形成的区域地质条件、人类工程活动等诱发条件和地灾发育现状条件,以定性评价为基础,通过信息系统空间分析定量计算对庐江县龙桥镇1∶10 000地质灾害易发性进行分区并评价。依据危险性等级阀值将其划分为高易发、中易发、低易发3个区,其中地质灾害高易发区面积为22.45 km~2,占全区总面积的21.34%;中易发区面积为26.44 km~2,占全区面积为25.13%;低易发区面积为56.31 km~2,占全区面积为53.52%。

In this paper, 1:10000 geo-hazard-prone zones in Longqiao Town of Lujiang County are divided and evaluated mainly by qualitative analysis, combined with GIS spatial analysis and quantitative calculation, on the basis of regional geological conditions, inducing conditions of human engineering activities and development conditions of the geo-hazards.According to the threshold values of the danger levels, three zones are divided, i. e., high risk, medium risk and low risk zones, which cover an area of 22.45 km~2, 21.34% of the total area, 26.44 km~2, 25.13% and 56.31 km~2, 53.52%, respectively.