基于信息量法的西丰县地质灾害易发性评价

Evaluation of Geological Disaster Vulnerability in Xifeng County Based on Information Content Method

地质灾害的发生不仅威胁着人类生命财产安全,也对经济发展与社会稳定产生重大影响.本文以辽宁省西丰县下辖的西丰镇、更刻乡等12个镇、6个乡为研究区,选取坡度、坡向、地形起伏度、岩性软硬程度、距河流远近、年平均降水量、土地利用类型和距道路远近等8个指标为评价因子,基于ArcGIS平台,结合信息量模型对西丰县进行地质灾害易发性评价,得到西丰县地质灾害高易发区、中易发区、低易发区划分图,并对地质灾害的发生的原因进行分析.结果表明:(1)高易发区主要分布在西丰县南部、东南部、东北部及河流两岸、道路沿线;中易发区和低易发区依次沿高易发区外围分布.(2)西丰县地质灾害的发育主要由坡度、岩性软硬程度影响因素控制,经降水因素诱发,受河流和道路建设所代表的人类活动的影响,并在坡向、地形起伏度、土地利用类型等多重因素的共同作用下,造成了西丰县地质灾害易发性分区的差异分布.

The occurrence of geological disasters not only threatens the safety of human life and property,but also has a significant effect on economic development and social stability.This paper evaluats the risk of geological hazards and analyzes the causes of its occurrence based on the selected evaluation indexes such as gradient,slope direction,relief,lithology degree of hardness and softness,distance from rivers,annual average precipitation,the types of land use and distance from roads.This paper get the Xifeng County geological disaster assessment map based on ArcGIS platform and combined with the information model.The results show that:(1)high-prone areas mainly distribute in the south,southeast and northeast of Xifeng County,as well as along the banks of rivers and roads;medium-prone areas and low-prone areas distribute along the high rock periphery in turn.(2)Xifeng County geological disaster development is mainly controlled by the influence factors of the slope,rock hard and soft degree,and affected by the precipitation and road representing human activity intensifies which is induced by the river.And the Xifeng County geological disaster degree of different distribution is mainly caused by the action of multiple factors such as land use type,the slope and the terrain fluctuation degree.