基于SBAS-InSAR技术的杨凌示范区自贸片区地面沉降发育特征研究

Research On The Features Of Land Subsidence Through The Sbas-Insar Technique In The Yangling Demonstration Zone Of Free Trade Area

自贸片区位于杨凌示范区南部,第四系松散层厚度较大,地下水资源丰富。为了查明杨凌示范区自贸片区地面沉降情况,分析地面沉降变形特征,为区域工程建设、城市地质灾害防治、国土空间规划等提供基础资料。采用SBAS-InSAR技术,在获取区内2017年~2022年Sentinel-1A 76景数据和数据预处理的基础上,分析了近5年平均沉降速率和累计形变量。结果表明,全区地面形变量为-84~40mm,形变速率为-18~7mm/a。大部分区域的形变速率为-5~5mm/a,地面沉降发育程度较弱,全区较为稳定。

The research area in the south of the Yangling Demonstration Zone is features in a great thickness of the Quaternary loose layer and rich in groundwater resources.In order to find out the land subsidence of the free trade area in Yangling Demonstration area,analyze the deformation characteristics of the land subsidence,and provide basic data for regional engineering construction,urban geological disaster prevention and control,and territorial space planning,the average settlement rate and the cumulative shape variables in the last 5 years were analyzed through the SBAS-InSAR technique on the basis of obtaining the pretreatment data and the data of 76-scene Sentinel-1A data in the area from 2017 to 2022.The result indicates that the surface deformation of the whole area was-84~40mm with a deformation rate ranging from-18 to 7mm/a.The deformation rate in the most of the area was-5~5mm/a,showing the development degree of land subsidence was comparative weak,and the whole area was relatively stable.