Shoreline Dynamics of Chongming Island and Driving Factor Analysis Based on Landsat Images

Chongming Island, the third largest island in China, has experienced dramatic shoreline changes due to erosion, river deposits, and human activities. While previous studies have shown capacity of Landsat series images extract dynamics, spatial variation dynamics their corresponding driving factors remain unclear. Therefore, we established a method monitor Island from 1984 2020 evaluate using novel approach image analysis. The method, based on LISA (local indicator autocorrelation) concept, automatically extracted imagery. results show that SWIR1 band, high for extraction Island. By distinguishing responses eastern northern shorelines upstream sediment loads comprehensively analyzing found that: (i) although decreased dramatically, is still expanding activities (i.e., reclamation an estuary project) re-suspension near-shore or cross-shore currents; (ii) expansion was initially at shoreline, but slowed after 2008 as sedimentation slowed, less construction cofferdams took place, Qingcaosha Reservoir constructed; (iii) expanded rapidly 1999, merger Xinlongsha, Xincunsha, transport coastal offshore sediments by hydrodynamic processes; (iv) main movement are cofferdam engineering, mainly affected projects, supplies, inflow. this study provide theoretical fundamentals land future urban planning