基于高精度时序In SAR技术的地表变化监测

Detection of Land Surface Change Based on High-precision Sequential In SAR Technology

合成孔径雷达干涉测量(InSAR)技术可全天时、全天候、大面积、高精度获取地表形变信息,已成功应用于地表塌陷、山体滑坡、泥石流、地面沉降等各类地质灾害监测。短基线集技术(SBAS-InSAR)是一种在传统D-InSAR技术基础上发展起来的一项时序InSAR技术,其监测地表形变的精度更高,甚至可以检测到毫米级别的形变。本文选取深圳市为研究区域,利用2015—2017年获取的41景Sentinel-1A数据,提取了该地区的时序形变、年平均沉降速率等结果。研究结果表明,深圳市部门区域出现不均匀沉降,部分地区沉降速率甚至超过-35mm/year,主要集中在城市重点建设区域如地铁施工,桥梁施工等地。本研究结果对深圳地区地面沉降灾害的防治与减缓有一定的理论和实际意义。

Synthetic Aperture Radar Interferometry (InSAR) technology can acquire the surface deformation information all-day, all-weather, large area and high precision. It has been successfully applied to monitoring various geological disasters such as surface subsidence, landslide, debris flow, land subsidence and so on. Especially, the high precision small baseline subset (SBAS) technology can effectively overcome the influence of space-time decorrelation and atmospheric effect, and the precision of surface deformation detection can reach millimeter level. In this paper, 41 Sentinel-1A data from 2015-2017 in Shenzhen are used to extract the results of time series deformation and annual average subsidence rate. The results show that uneven settlement occurs in Shenzhen, and subsidence rate in some areas is even higher than - 35 mm / year, mainly concentrated in key urban construction areas such as subway construction, bridge construction and so on. The results of this study have certain theoretical and practical significance for the prevention and control of land subsidence in Shenzhen.