郑州市地面沉降空间分布规律与风险区划

Spatial distribution regularity and risk zonation of ground subsidence in Zhengzhou City

为准确掌握特大城市——郑州市地面沉降空间分布规律特征,提升地面沉降风险评价和分区管控水平,以地面水准测量数据和SAR数据等为主要数据源,综合应用自然灾害风险指数、GIS空间分析等方法,在地面沉降危险性、易损性评价的基础上确定因子层,通过对评价因子进行无量纲处理和定量转化,最终得到郑州市地面沉降分布规律与地面沉降风险性分区。结果表明:①研究区地面沉降主要集中在东部、中北部区域,主要地面沉降区与地下水漏斗区范围基本相符,且位于研究区近年城市工程建设集中发展区;②研究区地面沉降危险性中等及以上区域位于研究区北部及东部,与该区域原生地质环境条件差相关;地面沉降易损性整体呈现由市中心向外围郊区降低的趋势,城市中心区易损度高与区域人口集中、经济化水平高、城市基础设施建设集中等密切相关;③郑州市地面沉降风险区划共分为低风险区、较低风险区、中等风险区三等。

To accurately understand the spatial differentiation characteristics of ground subsidence in the mega-city of Zhengzhou and to enhance the level of risk assessment and zoning control of land subsidence,this study utilizes ground leveling data and SAR data as the primary source.It employs the natural disaster risk index and GIS spatial analysis among other methodologies.The factor layer is determined on the basis of the evaluation of land subsidence risk and vulnerability.The distribution regularity and risk zones of land subsidence in Zhengzhou City are then quantified through dimensionless processing and quantitative transformation of evaluation factors.The findings indicate that①land subsidence in the study area predominantly occurs in the east and central north areas,aligning closely with the groundwater funnel areas and overlapping significantly with zones of intensive urban engineering construction in recent years.②Areas with medium to high subsidence hazard are primarily located in the north and east parts of the study area,being attributable to the inherently poor primary geological condition.The vulnerability to land subsidence diminishes from the city center to the suburbs.The high vulnerability in the urban core is intimately linked to the dense population,robust economic activity,and extensive urban infrastructure development.③The risk zoning of land subsidence in Zhengzhou is categorized into three levels,low risk,lower risk,and medium risk.