基于最优参数地理探测器的南通沉降成因分析OA

Aiming at the complex causes of land subsidence and insufficient quantification of driving mechanisms in coastal areas,this study takes Nantong City as a typical case.It uses SBAS-InSAR technology to extract the spatiotemporal characteristics of regional land subsidence from 2021 to 2023,integrates multi-source data,and applies the Optimal Parameters-based Geographical Detector(OPGD)model to analyze the main driving factors and their interactive effects.The results indicate that land subsidence in Nantong is mainly concentrated in coastal areas,with Rudong County experiencing the widest affected area;the annual average subsidence rate ranges from-14 to 13 mm/a,with the maximum subsidence rate reaches-138.31 mm/a.This area's land subsidence is driven by multiple factors,among which groundwater depth change being the dominant one.Factors such as building load,precipitation and land cover type exhibit significant enhanced interactions,confirming the coupled influence of human construction activities,hydrological conditions and resource utilization on land subsidence.