Abstract
In this work, quantitative analysis of coastal zone landform morphology is carried out through the integration of landscape index, remote sensing (RS) and geographic information system (GIS) technology, supplemented by geological data. The evolution of the coastal zone landform is investigated using digital elevation model (DEM) data simulation of the surface subsidence characteristics in the surface watershed DEM built on the basis of hydrological models, to analyze the egg coastal zone land subsidence process. The results show that from 1984 to 2004, the land subsidence area in the coastal zone increased from 332.66 hm2 to 1373.16 hm2 (about 4.13 times), with an average annual increase of 7.35%. From 2000 to 2004, it expanded by 12.85%, and the average settlement range increased from 0.18 m to 1.33 m. The expansion of the subsidence area of sand mining was extremely fast, reaching 25.52% from 1984 to 1996, and then decreasing to 5.75% from 1996 to 2000 and 2.4% from 2000 to 2004. Mine collapse increased from 324.35 hm2 in 1984 to 1203.79 hm2 in 2004, a 3.71-fold increase. Sediment deposition increased 20.38-fold from 8.31 in 1984 to 169.37 in 2004. It can be concluded that the subsidence caused by sand mining is more serious than mine collapse.
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