土工基础

›› 2017, Vol. 31 ›› Issue (3): 299-303.

• 工程实录 • 上一篇    下一篇

基于信息量法的地质灾害易发区评价

冷从德   

  1. （江西省地质灾害应急中心，南昌 330025）
  • 收稿日期:2016-06-29 修回日期:2016-07-04 出版日期:2017-06-25 发布日期:2017-06-26
  • 作者简介:冷从德（1983-），男，工程师，研究方向为地质灾害防治、应急处置等。
  • 基金资助:

    江西省崇义县1：5万地质灾害调查（赣国土资字［2013］ 185号）

Geological Hazard Risk Assessment Based on the Information Method: A Case Study of Chongyi County of Jiangxi Province

LENG Congde   

  1. (Emergency Geohazards Center of Jiangxi Province, Nanchang 330025)
  • Received:2016-06-29 Revised:2016-07-04 Online:2017-06-25 Published:2017-06-26

摘要： 以江西省崇义县为研究区，以崇义县1〖DK〗∶5万地质灾害调查数据为基础，基于信息量法，采用Arcgis软件研究地质灾害易发性。首先分析各类地质环境因子与地质灾害相关性，选取高程、坡度、水系、工程地质岩类、构造、居民区及公路七个影响因子。以地质灾害点为基础数据，将灾点与七个因子图层分别进行栅格运算，得出各个因子分段的灾点分布概率，计算出各个因子的信息量值,将各因子的信息量进行叠加，得出研究区内的信息量分布图。根据灾点在各信息量区间的概率，将研究区分为高、中、低、极低四个地质灾害易发级别。易发性评价结果与研究区实际情况吻合度高的结论，表明信息量法适合于崇义县地质灾害易性的评价。

关键词: 地质灾害, 易发区评价, 信息量法, GIS

Abstract: In this paper, the geological hazard investigation results of Chongyi County, Jiangxi Province are compiled with Arc GIS based on the information method of Geological Hazard Risk Assessment and the results are presented on a 1:50,000 geological hazard map. The relevance between the various factors and the geological hazard are investigated.  These potential factors that might triggering the geological hazards are: elevation and slope grade of the target object; watershed characteristics; engineering geology, lithology and tectonic structure; locations of residential communities and highways. These factors are grid computed based on the geohazard locations and the geohazard probability distribution and the segmental contribution of each factor and its information value are obtained. The information value of each factor is superimposed and the information distribution map of the target location can be obtained. Based on the probability of information of the each geological hazard point, the potential geohazard within the study area can be divided into high, medium, low, very low levels. The evaluation results and the predicted events are consistent with each other indicating that the proposed method could be useful.

Key words: Geological Hazards, Risk Assessments, Information Methods, GIS