Abstract:

Coral reef coasts are a common type of coast in our country， but widespread coastal erosion has led to severe damage to the growth environment of coral reefs in recent years. The erosion phenomenon at Dengloujiao Coast is also becoming increasingly serious， with large amounts of sandy mud being transported from the coast and accumulating in reef beds， affecting the habitat environment and growth of coral reefs. In this study， we use remote sensing image data and GIS analysis methods to interpret the erosion degree of Dengloujiao Coast from 2010 to 2020， and briefly analyze its causes and propose protective measures. The results show that： （1） The erosion area of Dengloujiao Coastline showed an increasing trend and reached its maximum in 2019-2020， with section II having a consistently large erosion area over the past decade， and the most severe erosion in section II occurred from 2015 to 2017. The erosion of Dengloujiao Coastline has been significant over the past decade， and the rate has accelerated. （2） Based on field investigations， it was found that coastal erosion at Dengloujiao is related to many factors. The sandy coastline serves as the material foundation for coastal erosion， while climate factors and rising sea levels are the fundamental causes. Coral reef death， stormy weather， and human activities exacerbate the rate of coastal erosion. Corresponding protective measures are proposed based on the varying degrees of coastal erosion to mitigate erosion hazards and ensure the safety of the Dengloujiao coastline， creating a suitable living environment for corals. These measures also serve as a reference for the prevention and control of erosion in sandy coral reef coasts.

Key words: sandy coastline, coral reef, remote sensing interpretation, erosion change, wave-breaking sand stabilizer