Shoreline change analysis in Phu Quy island using satellite images and digital shoreline analysis system

Abstract

     Shoreline erosion is becoming a concern of many countries around the world due to climate change and sea level rise. The coast in Vietnam have been strongly eroded in recent years, this is not only affecting the socio-economy, people's lives, but also the national security and defense. The coast of Phu Quy island is one of the areas where erosion has occurred in many years in Vietnam. This article has applied the cloud-based platform Google Earth Engine and Digital Shoreline Analysis System (DSAS) to analyse the change of Phu Quy island shoreline based on the Landsat and Sentinel-2 images taken from 2000 to 2020. The results show that erosion and deposition occurred alternately in the studied island coast. The analysis index obtained from DSAS shows that the average rate of coastal erosion is about 0.79 m/year and the severe erosion is up to 5 m/year occurs in the West, South and South-West of the island. On the contrary, the accretion and stability coast of the island are in the North and the East of the island with an average rate of accretion of about 1.38 m/year.