基于GIS和信息量模型的青海大通县地质灾害危险性定量评价分析

Quantitative Risk Assessment of Geohazards in Datong, Qinghai Based on GIS and Information Quantity Model

本文以地处黄土高原西端向青藏高原的过渡地带的大通县为研究区,根据区内地质环境条件及地质灾害发育特征,选择坡度、地形起伏度、工程地质岩组、与断层距离、与河流水系距离及人类工程活动6个诱发因素作为地质灾害危险性的评价因子,采用基于GIS的信息量模型进行危险性评价,将获得的综合信息量图划分为5级危险区:极低度、低度、中度、高度和极高度。为区内地质灾害防治工作提供科学依据。

This paper selects 6 inducing factors such as slope,relief,engineering geological petrofabric,distance from the fault,distance from the river system and human engineering activities to be the risk assessment factors of geohazards and carries out risk assessment of geohazards based on GIS information quantity model in Datong,Qinghai.The obtained comprehensive information map is divided into 5 hazardous zones:extremely low hazardous,low hazardous,medium hazardous,high hazardous and very high hazardous zones.