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基于SBAS-InSAR技术的西安市地面沉降监测

冉培廉1, 李少达1, 杨晓霞1, 戴可人1,2, 苟继松1

1.成都理工大学 地球科学学院，四川 成都 610059;2.成都理工大学 地质灾害防治与地质环境保护国家重点实验室，四川 成都 610059

摘要:地面沉降是因人为活动和自然因素引发松散地层压缩导致的局部地面高程降低的地质现象，短基线干涉测量技术（small baseline subset interferometry ， SBAS-InSAR ）能够有效克服时空去相干和大气效应的影响，可长时间、高精度监测地表微小形变。为了掌握西安市的地面沉降情况，包括沉降中心位置、沉降速率、累积沉降量等，选取2017—2018年覆盖西安市的31景 C波段Sentinel-1 A升轨影像，采用SBAS-InSAR技术提取西安市的地面沉降速率和累积沉降量，并从地理空间上分析西安市产生地面沉降的原因。结果表明，西安市的地面沉降区域主要集中在南部，鱼化寨沉降区的沉降速率超过70 mm/a，电子城沉降区的沉降速率在40~50 mm/a 间，三爻站与凤梧原站沉降区的沉降速率在50~60 mm/a间，与以往的研究比较发现，西安市的地面沉降在逐渐减弱。研究结果可为西安市的地面沉降灾害防治工作提供参考依据。

关键词:Sentinel-1A;SBAS-InSAR;西安市;地面沉降;地理空间分析;沉降因素

doi:10.16186/j.cnki.1673-9787.2020080007

基金项目:国家自然科学基金资助项目（41771444）

收稿日期:2020/08/01

修回日期:2020/09/21

出版日期:2021/05/15

Monitoring of Xi' an city land subsidence based on SBAS-InSAR

RAN Peilian1, LI Shaoda1, YANG Xiaoxia1, DAI Keren1,2, GOU Jisong1

1.College of Earth Sciences， Chengdu University of Technology， Chengdu  610059 ， Sichuan， China;2.State Key Laboratory of Geohazard Prevention and Geoenvironment Protection， Chengdu University of Technology， Chengdu  610059 ， Sichuan， China

Abstract:Land subsidence is a geological phenomenon that local ground elevation is reduced due to the compression of loose strata by human activities and natural factors. SBAS-InSAR technology can effectively overcome the influence of spatiotemporal decoherence and atmospheric effect， and can monitor small surface deformation with high precision and long time. In order to master the current situation of land subsidence in Xi'an， including land subsidence center location， land subsidence rate and accumulated land subsidence volume etc ， Sentinel-1 A ascending images of 31-C band covering the Xi'an during 2017-2018 were selected to extract the land subsidence rate and land subsidence volume of Xi，an by SBAS-InSAR technology， and analyze the causes of land subsidence from the geographical space in Xi'an were analyzed in this paper. The results showed that land subsidence area in Xi'an mainly concentrated in the south， the subsidence rate of Yuhuazhai subsidence area was more than 70 mm/a， the subsidence rate of Electronic City subsidence area was between 40〜50 mm/a， and the subsidence rate of Sanyao station and Fengwuyuan station subsidence area was between 50 ~ 60 mm/a. Compared with the previous studies， it was found that land subsidence rate in Xi'an was gradually decreasing. It could provide reference for the prevention and control of land subsidence in Xi'an city.

Key words:Sentinel-1 A;SBAS-InSAR;Xi' an city;land subsidence;geospatial analysis;subsidence factors

 基于SBAS_InSAR技术的西安市地面沉降监测_冉培廉.pdf