doi:10.16186/j.cnki.1673-9787.2020080007

Received:2020/08/01

Revised:2020/09/21

Published: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