Research on the Change of Coastline on the South Coast of Hangzhou Bay Based on Multi-temporal Remote Sensing Images

Abstract

Coastline is an important geographic background for each coastal area, and dynamic monitoring of coastlines is beneficial to coastal natural protection and further coastal construction and development. Based on the Landsat8 data and Sentinel-2 data from 2014 to 2019, this paper uses a method combining regional growth and edge detection to analyze the Cixi section’s coastline changes on the south bank of Hangzhou Bay. Firstly, the multi-source remote sensing data is preprocessed, and then the MNDWI value of each image is calculated. Then, each image is processed into a binary image by a regional growth algorithm. Eventually, we realize the coastline segmentation by the Canny operator of edge detection. The research represents that the coastline of the south coast of Hangzhou Bay moves toward the ocean year by year, and the length of the coastline generally decreases. The analysis may be caused by human-made activities in Hangzhou Bay Area in recent years, such as river cut-offs and urban construction. The research in this paper provides a reference for the protection of natural coastlines and human-made coastlines.