1. Marine Science and Technology College, Zhejiang Ocean University, Zhoushan 316022, China 2. Zhejiang Province Ecological Environment Monitoring Centre (Zhejiang Key Laboratory of Ecological and Environmental Monitoring, Forewarning and Quality Control), Hangzhou 310012, China 3. State Key Laboratory of Satellite Ocean Environment Dynamics (Second Institute of Oceanography, MNR), Hangzhou 310012, China 4. State Information Center, Beijing 100045, China 5. Xiamen Raw Water Investment Co., Ltd., Xiamen 361000, China 6. School of Economics and Management, Zhejiang Ocean University, Zhoushan 316022, China
With a special geographical location and abundant marine resources, Zhoushan is the first prefecture-level city composed of islands in China. Therefore, the acquisition of dynamic information on the coastline is of great significance to this area. However, the large amount of suspended sediments, the tortuous coastline, the numerous tidal flats and some other factors have brought a lot of challenges to coastline extraction and the analysis of the spatial-temporal dynamics in Zhoushan Islands. In order to solve this problem, the authors have developed a method for extracting coastline remote sensing information based on the tasseled cap transformation and used long time series satellite remote sensing data to carry out the analysis of the temporal and spatial evolution of the coastline. The experimental results show that the proposed method can effectively remove the influence of suspended sediments, winding coastline and shoals on the extraction of coastline information, and make its position accurate. From 2000 to 2018, the total length of the coastline of Zhoushan Islands increased by about 327.36 km, the average growth length was 18.19 km, the average growth rate was 0.72%, the total area of Zhoushan Islands increased by about 112.26 km2, the average growth area was 6.24 km2, and the average growth rate was 0.49%. The constructions of reclamation and marine projects seem to have been the main reasons for Zhoushan’s coastline changes. This study is of great significance for improving the accuracy of coastline remote sensing information extraction as well as coastal development and protection in complex marine environments.
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2021, Vol. 33 
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