Analysis of coastal deformation detection and causes in beibu gulf of guangxi based on ps-insar

In order to explore the land deformation and its causes in the coastal areas of Guangxi Beibu Gulf, 36 Sentient-1A satellite images were used to obtain the surface subsidence rate and cumulative deformation of Guangxi Beibu Gulf from January 2018 to December 2020 based on PS-InSAR technology. Combining night-light remote sensing and rainfall data, we analyzed the causes of surface deformation. The results reveal: The deformation space within 4 km of the coastline of Beibu Bay and the urban areas of Fangchenggang, Qinzhou and Beihai were mainly in the port area of Fangchenggang, Qinnan District of Qinzhou and Haicheng District of Beihai, with the maximum accumulated settlement of -174.3 mm and the average deformation rate of -22.664 mm/a. The land subsidence rate in the Beibu Gulf area was affected by human activities and groundwater level, and the cumulative subsidence was positively correlated with the intensity of human activities. The rate of surface deformation decreases during the rainy season in July and August every year.