E3S Web Conf.
Volume 290, 20212021 3rd International Conference on Geoscience and Environmental Chemistry (ICGEC 2021)
|Number of page(s)||5|
|Section||Geological and Hydrological Structure and Environmental Planning|
|Published online||14 July 2021|
PS-InSAR based surface subsidence analysis in Changchun metropolitan area
1 College of Geo-exploration Science and Technology, Jilin University, Changchun 130026, China
2 China Water Northeastern Investigation Design & Research Co. Ltd Changchun 130062, China
3 Changchun Institute of Surveying and Mapping, Changchun 130021, China
* Corresponding author: Wuqiong@jlu.edu.cn
The monitoring of urban land surface subsidence is the main task of urban disaster prevention and mitigation. In this paper, the land surface subsidence process in Changchun metropolitan area is calculated based on PS-InSAR technology by using the SLC data of Sentinel-1B with 50 scenes within the metropolitan area of Changchun from 2016 to 2020. The results show that the metropolitan surface of Changchun is basically in a stable state, the main settlement is located in the southeast of the metropolitan around the Century Square, the maximum settlement rate is 20.45mm/a, the average settlement rate is 2.98mm/a, the correlation coefficient between the settlement results calculated by PS-InSAR and the second-class leveling verification results reaches 0.67, which indicates that the regional settlement results calculated by PS-InSAR have high reliability. The subsidence area is dominated by the geological structure of the Mesozoic Cretaceous Yaojia Formation, with many intercalations of fine silty sand rocks and locally containing medium-coarse gravel sandstone. The overall structural stability is poor, which may be the main reason for subsidence in this area.
© The Authors, published by EDP Sciences, 2021
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