基于信息量模型的地质灾害易发性评价——以天府新区成都直管区为例

Evaluation of Geohazard Susceptibility Based on Information Quantity Model——By the Example of Tianfu New District,Chengdu

本文选择天府新区成都直管区为研究区,基于因素相关性分析结果,选取坡度、坡向、地形起伏度、地貌、岩性、汛期降雨量、人口密度和崩滑密度8个要素作为地质灾害易发性评价因子,应用信息量模型,分析各因子对研究区地质灾害发生的贡献,开展研究区地质灾害易发性区划。结果表明:研究区地质灾害主要沿龙泉山西翼呈条带集中分布,易发等级总体上由东向西递减分布,灾害点空间分布与易发等级呈正相关性,信息量模型应用评价结论,可为该区地质灾害防治提供参考。

By the example of the Tianfu New District,Chengdu,this paper selects 8 essential factors such as slope grade,slope direction,topographic relief,landform,rock character,rainfall in flood season,population density,and avalanche density to be evaluation factors of geological hazard susceptibility and applies information quantity model to analysis of the contribution of each factor to the occurrence of geological disasters in the study area and carries out divisions of geological hazard susceptibility in the study area.The results indicate that the geohazards in the study area are mainly distributed along the west flank of the Longquan Mountains.On the whole,the susceptibility grade decreases from east to west and the spatial distribution of geohazard points is positively correlated with the susceptibility grade.