关键词: 黄河三角洲, 海岸线变化, 地面沉降, DS-InSAR, 一般高潮线

Abstract: In response to the severe land subsidence and escalating coastal erosion risks near the coastline of the Yellow River Delta, this paper proposes an integrated monitoring and analyzing framework of coastline change and land subsidence based on DS-InSAR and general high tide line method, combined with the vertical section method. The paper carries out the monitoring and analysis of coastline change and land subsidence in the Yellow River Delta from 2020 to 2024. The results show that land subsidence in the Yellow River Delta is concentrated along the eastern coast, forming four significant subsidence funnels (A,B,C,D), with a maximum subsidence rate of -350 mm/a. Due to the reclamation and stabilization of the artificial coastline, the coastline is basically stable in zone A. Zone B is close to the estuary of the Yellow River, with dramatic changes in the siltation, erosion and recession of the coastline, and the innermost part of the coastline is about 4 km away from the center of the subsidence. The overall siltation and erosion of the coastline in zone C is 0.91 km, about 8 km from the center of subsidence. The coastline of zone D is slowly eroding, with the innermost part of the coastline about 0.15 km from the dyke and 9 km from the center of subsidence. The results of the study have a reference value for the comprehensive management of the coastline.

Key words: Yellow River Delta, coastline change, land subsidence, DS-InSAR, general high tide line