Journal of Marine Sciences ›› 2023, Vol. 41 ›› Issue (2): 71-82.DOI: 10.3969/j.issn.1001-909X.2023.02.006

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Spatio-temporal evolution and driving factors analysis of the coastline in Nan’ao Island from 1976 to 2021

NING Zihao1(), JIANG Changbo1,2,*(), LONG Yuannan1,3,4, WU Zhiyuan1,3,4, MA Yuan1   

  1. 1. School of Hydraulic and Environmental Engineering, Changsha University of Science & Technology, Changsha 410114, China
    2. Hu’nan University of Technology, Zhuzhou 412007, China
    3. Key Laboratory of Water-Sediment Sciences and Water Disaster Prevention of Hu’nan Province, Changsha 410114, China
    4. Key Laboratory of Dongting Lake Aquatic Eco-Environmental Control and Restoration of Hu’nan Province, Changsha 410114, China
  • Received:2021-08-26 Revised:2022-11-13 Online:2023-06-15 Published:2023-07-27


Coastline is one of the important geographical elements to describe the boundary between land and sea. Under the dual influence of natural factors and socio-economic factors, coastline dynamic evolution of different intensities continues to occur. Based on Landsat series satellite remote sensing images, the spatial and temporal evolution of the coastline of Nan’ao Island from 1976 to 2021 was analyzed by RS and GIS technology combined with field investigation, and the driving factors were analyzed by grey correlation analysis. The results show that : (1)In the past 45 years, the coastline of Nan’ao Island has changed significantly. The coastline length has increased by 11.06 km, and the fractal dimension have generally increased.(2)During the study period, the type of coastline changed from natural coastline dominated by bedrock to artificial coastline, the comprehensive index of coastline utilization show an increasing trend, and the main structure of coastline development and utilization show a form of single to multiple.(3)The evolution of the coastline of Nan’ao Island has obvious regional differences. That of Houzhai Town is greatly affected by human factors, and its evolution is more significant. The coastlines of Yun’ao and Shen’ao Towns are mainly affected by natural factors, and their evolutions are relatively slow.(4)Typhoon(natural disasters) and population are the main driving factors of the coastline evolution of Nan’ao Island.

Key words: Nan’ao Island, coastline, remote sensing, change analysis

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