Monitoring and analysis of the subsidence in Changsha from 2015 to 2021 based on InSAR technique

doi:10.13474/j.cnki.11-2246.2023.0212

Abstract

Abstract: Changsha city is an important central city in the middle reaches of Yangtze River. The geological condition is fragile and the soil is loose. Under the action of construction and rainfall, the soil is easy to consolidate and compact, resulting in ground deformation and threatening the stability of buildings and infrastructure. Land subsidence is one of the main causes of geological disasters in Changsha city. In order to monitor the land subsidence of Changsha city in recent years, we use the technology of MCTSB-InSAR and 151 Sentinel-1 data to obtain the land subsidence results of the main urban area of Changsha City from 2015 to 2021. The results show that the maximum accumulated settlement is about 250 mm, the maximum settlement rate is about 80 mm/a, and the average settlement rate in most areas is below 30 mm/a. The overall stability of Changsha city, local uneven settlement occurred, settlement area mainly distributed in the periphery of the main city, mainly caused by engineering construction.

Key words: land subsidence, MCTSB-InSAR, the main urban area of Changsha city, subsidence development, construction

CLC Number:

P237
258

YANG Jiancheng, HE Yang, LIU Yiming, XIONG Xiong, YAO Haipeng, LI Xueyu, WEN Wufei, WANG Lingjue, HU Miaowen, XU Bing. Monitoring and analysis of the subsidence in Changsha from 2015 to 2021 based on InSAR technique[J]. Bulletin of Surveying and Mapping, 2023, 0(7): 125-130.

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