摘要
处于龙门山地震带的绵阳市安州区是绵阳市主城区之一,和“成德绵经济带”前沿对接点,在该区域进行滑坡灾害风险性评价,可为研究区滑坡灾害风险管控、防治、基础设施建设选址提供技术支持。本文以ArcGIS空间分析模块为技术平台,选取地震烈度、距发震断裂距离、距水系距离、海拔高程、地表坡度、岩性硬度6类评价指标并对每一等级指标因子进行敏感度分级,运用指标加权叠加的方式将安州区划分为高风险区、中风险区、低风险区等不同级别滑坡灾害风险区。对各风险区面积及各风险区内滑坡灾害点数量进行统计分析,表明74.93%的滑坡灾害点集中分布于汶川地震发震断裂(北川-映秀断裂)南北两侧的高风险区,该区域应作为滑坡灾害风险控制与管理的重点区域。彭县-灌县断裂东南侧滑坡灾害发生的风险性较小,该滑坡低风险区可作为绵阳市安州区村镇建设和居民点建设的主要规划区域。
Anzhou district of Mianyang city located in the Longmen mountain seismic region is one of the main urban districts of Mianyang city and the front contact point of"Chengdu-deyang-Mianyangeconomicbelt",the risk assessment of landslide was carried out in this area,the conclusion was helpful for disaster risk management and control and site selection for infrastructure construction,research findings could provide technical reference for the divisions of risk of geological hazardin other regions.ArcGIS spatial analysis module was taken as the technical platform,six evaluation indexes were selected,such as seismic intensity,distance from seismic fault,distance from water system,elevation,surface slope and lithologic hardness,the sensitivity of evaluation indexes was graded,Anzhou district was divided into different regions of landslide risk by means of weighted overlay analysis.The area of each risk region and the number of landslide disaster points in each risk region were counted and analyzed 74.93%of the landslide disaster sites are concentrated in the high risk areas on the north and south sides of the seismogenic fault of Wenchuan earthquake(Beichuan-Yingxiu fault),which should be the key area for landslide disaster risk control and management.The risk of landslide disaster on the southeast side of Pengxian-Guanxian fault is small,and this low-risk area can be used as the main planning area for the construction of villages and towns and settlements in Anzhou district of Mianyang city.
作者
陈浩
林孝先
董廷旭
李勇
Chen Hao;Lin Xiaoxian;Dong Tingxu;Li Yong(College of Resources and Environmental Engineering,Mianyang Teachers’College,Mianyang 621006,Sichuan,China;National Key Laboratory of Oil and Gas Reservoir Geology and Exploitation,Chengdu University of Technology,Chengdu 610059,China;不详)
出处
《科技通报》
2024年第11期110-115,共6页
Bulletin of Science and Technology
基金
四川省科技厅科技计划项目(2019YJ0496)
绵阳师范学院质量工程项目(Mnu-JY20239)。
关键词
地震区
滑坡灾害
风险性评价
安州区
seismic region
landslide
risk assessment
Anzhou distric