Analysis of local surface subsidence characteristics in Tianjin based on InSAR technology

doi:10.13474/j.cnki.11-2246.2024.0213

Abstract

Abstract: Tianjin is one of the areas in our country with the most severe ground subsidence. This article is based on the integrated distributed scatterer interferometry (DS-InSAR) technology, which processed 58 scenes of Sentinel-1A data from January 2021 to June 2023. It obtained the latest surface deformation characteristics in the southern region of Tianjin. By combining information on land use, hydrogeology, and other factors, a typical subsidence analysis was conducted. The results are as follows:①There is significant variation in the distribution of ground subsidence in Tianjin, with obvious uneven subsidence characteristics. The southwestern region is the most severely affected area, with a maximum subsidence rate of 85.2 mm/a. ②The ground subsidence in Tianjin is closely related to excessive groundwater extraction, increased surface loading, and geological structures. This study provides data support and decision-making basis for geological disaster prevention and control in Tianjin.

Key words: DS-InSAR, D-InSAR, Tianjin, land subsidence, feature analysis

CLC Number:

P237

ZHANG Qian, MA Yue, ZHOU Hongyue, YAN Shiyong. Analysis of local surface subsidence characteristics in Tianjin based on InSAR technology[J]. Bulletin of Surveying and Mapping, 2024, 0(2): 74-79.

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