Temporal and Spatial Changes of Continental Coastline in Zhejiang in Recent 50 years

Abstract

This paper selected six representative Landsat, SPOT-5 and GF-1 satellite remote sensing images in the past 50 years between 1970 and 2018. The digital shoreline analysis system was used to analyze the change of continental shoreline in Zhejiang Province by using the area method and the baseline method. Besides, the driving force of shoreline change was also analyzed. The results showed that: (1) The seaward extension of the shoreline mainly occured in Hangzhou Bay, Xiangshan Port, Sanmen Bay, Taizhou Bay, Yueqing Bay and Oujiang Port. The reclamation area was 147 700 hectares, and the average change rate of coastline was 26.72 m/a. (2) Over the past 50 years, the continental coastline of Zhejiang Province had shown an obvious decreasing trend. The coastline had decreased by 184.27 km while the natural coastline decreased by 381.37 km and the artificial coastline increased by 197.10 km. (3) The continental coastline of Zhejiang Province was dominated by artificial coastline with the serious straightness and the decrease of natural shoreline retention. (4) Human activities such as reclamation and reclamation were the main driving factors of shoreline change.

Keywords

• zhejiang province
• shoreline
• shoreline change
• the digital coastline analysis system