Analysis of the Changes in Coastline and Island Morphology of the Southern Five Islands of Miaodao Archipelago
Based on Landsat remote sensing images from 1980 to 2020,aiming at the unclear issues of the long-term coastline and island morphology changes in the five southern islands of Miaodao Archipelago in long-term series,this paper analyzed the spatial-temporal characteristics of the type and structure of coastline and changes of island morphology over the past 40 years,and explored the main driving factors.The results showed that the total length of coastline in the study area has increased by 13.58 km or 21.68％over the past 40 years,with an average annual growth rate of 0.34 km/a.The proportion of natural coastline in the study area has been declining,and the natural coastline has gradually changed to wharf and embankment.The degree of the coastline tortuosity in the study area has increased,and the morphology of each island has differently changed,in which the Nanchangshan Island has undergone the greatest morphological changes,while the other areas are relatively stable.The changes of coastline morphology in the study area have been influenced both by the human activities,policy factors and the natural factors,dominated by seaward expansion and mainly for the coastal constructions such as wharfs and reclamation projects.The results of the research will provide basic data and scientific basis for understanding the spatial resource changes and carrying out ecological restoration in the Miaodao Archipelago.
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万方数据
