摘要
地面沉降灾害已经成为制约地区社会经济可持续发展的重要因素,风险评估和管理是实现灾害防治从被动防御向主动防治转变的标志。根据地面沉降现状以及区域地质情况、水文地质条件等,分析了盐城地区的地面沉降机理及其主要影响因素。结合盐城实际,选取累计地面沉降量、地面沉降速率、软土层厚度、主要开采层厚度、地下水开发利用程度作为危险性指标以及单位面积GDP比重、人口密度比重、地面高程作为易损性指标,绘制了危险性分区图和易损性分区图,建立地面沉降风险评价体系。利用层次分析-综合指数法和MapGIS空间分析功能,开展地面沉降风险综合评价。根据评价结果并结合地面沉降现状和已有的防治措施,提出切实可行的改进措施和建议。
Land subsidence disasters have become an important factor which restricts the sustainable development of society and economy in areas.Risk assessment and management are the signs that prevention and control of disasters will change from passive to active mode.Based on the current situation of land subsidence,regional geological conditions and hydrogeological conditions,formation mechanism and main influencing factors of land subsidence in Yancheng were analyzed.According to the practical situation in Yancheng City,cumulative land subsidence volume,rate of land subsidence,thickness of soft soil layer,thickness of main exploiting strata and development and utilization of groundwater were selected as the hazard indexes to draw the hazard zoning map,and proportion of GDP per unit area,proportion of population density and the ground elevation were selected as the vulnerability indexes to draw the vulnerability zoning map.The evaluation indexes were optimized and the indicator system of risk evaluation on land subsidence was established.Based on the susceptibility and vulnerability,the comprehensive risk assessment of land subsidence was carried out by using the analytic hierarchy-comprehensive index and the spatial analysis function of MapGIS.According to the evaluation results,the present situation of land subsidence and the current prevention and cure in Yancheng,practical improvement measures and suggestions were proposed.
作者
顾晟彦
姚维军
徐明钻
王丹
GU Shengyan;YAO Weijun;XU Mingzuan;WANG Dan(Geological Exploration Techniques Institute of Jiangsu Province,Nanjing,Jiangsu 210008,China)
出处
《中国地质灾害与防治学报》
CSCD
2020年第1期36-43,共8页
The Chinese Journal of Geological Hazard and Control
基金
江苏省地质勘查基金专项(201838)
关键词
地面沉降
风险评价
防治建议
江苏盐城
land subsidence
risk evaluation
prevention suggestion
Yancheng,Jiangsu
