鹤峰县地质灾害易发性评价

Evaluation of Geological Disaster Susceptibility in Hefeng County

依据鹤峰县地质灾害风险调查最新数据,通过对区内地质环境条件和地质灾害发育特征与分布规律的分析研究,采用信息量模型法,选定高程、坡度、工程地质岩组、斜坡结构、距断层的距离、植被覆盖度、距水系的距离、距道路的距离等8个主要致灾因素作为评价因子,进行地质灾害易发性分区评价。发现不同致灾因子对地质灾害致灾效果有明显区别,在高程<1000 m,坡度10°~30°,坚硬石英砂岩岩组、坚硬—半坚硬白云岩—砂岩—页岩岩组和半坚硬—软弱粉砂岩—泥岩岩组,顺向坡和逆向坡,距断层距离<800 m,中低植被覆盖区,距水系距离<200 m,距道路距离<100 m这些条件下地质灾害更为发育;且在其中高程<1000 m、中低植被覆盖区、距水系距离<200 m、距道路距离<100 m条件下最为易发。将研究区划分为极高易发区、高易发区、中易发区和低易发区,面积分别为210.86、674.00、1427.99、555.86 km^(2),分别占研究区总面积的7.35%、23.49%、49.78%、19.38%。此研究为该区城乡发展规划及防灾减灾预警工作提供了科学依据。

Based on the latest survey data of geological disaster risk survey in Hefeng County,through the analysis and research on the geological environment conditions and the development characteristics and distribution law of geological disasters in the study area,the information model method is adopted.Eight main disaster-causing factors,including elevation,slope,engineering rock group,slope structure,distance from fault,vegetation coverage,distance from water system and distance from road,are selected as evaluation factors to carry out the zoning evaluation of geological disaster susceptibility.It is found that different disaster-causing factors had obvious differences in the disaster-causing effect of geological disasters,with elevation<1000 m and slope of 10°~30°.Under the conditions of hard quartz sandstone group,hard-semi-hard dolomite-sandstone-shale rock group,semi-hard-weak siltstone-mudstone rock group,along-slope and reverse-slope,the distance from fault is less than 800 m,middle-low vegetation cover area,the distance from water system is less than 200 m,and the distance from road is less than 100 m,geological disasters are more developed,and under the conditions of elevation<1000 m,middle-low vegetation cover area,the distance from water system is less than 200 m,and the distance from road is less than 100 m,geological disasters are most likely to occur.the study area is divided into high-prone areas,high-prone areas,medium-prone areas and low-prone areas,with the areas of 210.86 km^(2)、674.00 km^(2)、1427.99 km^(2) and 555.86 km^(2),respectively,accounting for 7.35%、23.49%、49.78%and 19.38%of the study area,which provides a scientific basis for urban and rural development planning and disaster prevention and mitigation warning in the study area.