江苏沿海地面沉降的高分辨率时序InSAR监测与分析

Land subsidence monitoring of Jiangsu coastal areas with high resolution time series InSAR

为掌握江苏沿海地区地面沉降最新情况并查明主导因素,该文以广域高分辨率时序InSAR分析为处理方法,解译获取了该区域地面沉降现状,并利用基岩标测量数据评价了监测结果的可靠性,同时综合地质条件、实地调查等方式实现了研究区地面沉降影响因素的详细分析。结果表明:InSAR与基岩标数据对比中误差为2.58mm,一致性程度高;监测时段内研究区地面沉降呈小范围、零星分布发育特征,且与水产养殖大棚、厚软土区空间分布高度一致,说明水产养殖大棚抽采地下水与软土区施工建设是江苏沿海地区现阶段地面沉降的主要影响因素;研究区沉降速率超过80mm/a的严重区面积达到了15.8km^(2),且全部位于连云港市。

In order to grasp the latest situation of land subsidence in Jiangsu coastal area and find out the leading factors,this paper interprets and obtains the current situation of land subsidence in this area by using the wide area high-resolution time series InSAR analysis as the processing method,and evaluates the reliability of the monitoring results by using the bedrock marker measurement data,integrating optical images,geological conditions through field investigation,the influencing factors of land subsidence in the study area are analyzed in detail.The results show that the mean square error between InSAR and bedrock standard data is 2.58mm,and the degree of consistency is high;during the monitoring period,the land subsidence in the study area is characterized by small-scale,sporadic distribution and development,and is highly consistent with the spatial distribution of aquaculture shed and thick soft soil area,indicating that the pumping of groundwater in aquaculture shed and the construction of soft soil area are the main influencing factors of land subsidence in Jiangsu coastal area at the present stage;the area of serious area with settlement rate exceeding 80mm/a in the study area reaches 15.8km^(2),and all of them are located in Lianyungang City.