基于时序InSAR技术的蔚县地面形变监测

Ground Deformation Monitoring in Yuxian Based on Time Series InSAR Technology

合成孔径雷达干涉测量(InSAR)技术在城市地表形变监测中具有高精度、高分辨率、低成本、空间连续监测等优势。以河北省张家口市蔚县为研究区域,获取了20景TerraSAR-X影像,分别采用PS-InSAR和SBAS-InSAR两种时序技术得到了蔚县城区2015年6月9日到2016年1月4日期间地面平均沉降速率,结果表明,两种时序InSAR技术监测沉降结果具有很高一致性,而且相关性较高,达到0.9以上,城区中心发生了比较严重的地表沉降,形成了一个明显的沉降漏斗,沉降速率达到了30mm/a,地下水的严重开采以及建筑物的加速构建是引起该区域地面沉降的主要原因,该研究可以为城市地面沉降治理、整体规划等提供参考意义。

Synthetic Aperture Radar Interferometry(InSAR)technology has the advantages of high precision,high resolution,low cost and continuous monitoring of space in urban surface deformation monitoring.This paper takes the Yuxian County of Zhangjiakou City,Hebei Province as the research area,and obtains 20 TerraSAR-X images.The average settlement rate of the land in Yuxian City from June 9,2015 to January 4,2016 was obtained by using PS-InSAR and SBAS-InSAR timing techniques respectively.The results show that two timing InSAR techniques have a high consistency in monitoring the settlement results,and the correlation is high,reaching 0.9 or more.A relatively serious surface subsidence occurred in the center of the city,forming an obvious settlement funnel with a sedimentation rate of 30 mm/a.The serious exploitation of groundwater and the accelerated construction of buildings are the main causes of land subsidence in this area.This study can provide reference for urban land subsidence treatment and overall planning.