1986 年以来珠海市海岛海岸线变迁特征与驱动因素.

The change of the coastline has an extremely important impact on the safety of the wharf and port, the ecological environment of the island and the development of coastal industries. Therefore, analyzing the temporal and spatial evolution characteristics of island coastlines and its driving factors is of great significance for government to strengthen coastal management, improve the environment quality of islands, and maintain sustainable development of islands. Research selected the Landsat satellite data of Zhuhai City in 7 years from 1986 to 2021, employed the MNDWI and manual visual interpretation to extract the coastal waterline of the island, and analyzes the changes in the length of the coastline and the area of the island in each time period. As a result, the research objects are divided into islands with slight coastline changes and islands with significant coastline changes. DSAS module and multi-source data are employed to explore the driving factors affecting the temporal and spatial changes of island coastlines. The conclusionsare as follows: 1) In the past 35 years, the coastline length of each island in Zhuhai City has changed significantly, and the change trend of each island area is different. 2) The island has undergone large-scale construction activities in the past 35 years, and the coastline has changed significantly. The LCI in each period is in the range of 1.1-2.2, and the ACI is in the range of 1.1-3.3; the island has a slight coastline change due to the development disadvantages and island protection policies determined by the natural conditions of the islands, the degree of island development is low, the coastline changes slightly, and the LCI and ACI in each period are within the range of 0.9-1.1. 3) Human activities are the direct driving factor affecting the change of the island coastline, and the specific manifestations are island-connecting projects, land reclamation, and construction of wharfs. The indirect drivers of shoreline change are macroscopically the development of islands as a key driver of Zhuhai's marine economy and the human activities brought about by industrial development that affect shoreline change. Microscopically, the related island has the potential to develop related industries or contains rare ecological populations that need to be protected, and the resulting construction projects such as reclamation, island linkage or urban planning policies affect the island's shoreline change. Research departs from the micro perspective of existing studies at the research scale and takes a medium to macro perspective by selecting 66 islands in Zhuhai to explore the commonalities and characteristics of shoreline changes in each island. In terms of analysis depth, study combined government planning documents at various stages of Zhuhai City to deeply explore the indirect impact of planning on shoreline changes, which was rarely discussed in existing studies. This research can provide more comprehensive data support and reference materials for Zhuhai and the GBA to formulate island development strategies, and has practical and academic value. [ABSTRACT FROM AUTHOR]