Abstract
Based on the Landsat remote sensing data, this paper had monitored the coastline changes of Xiamen city in recent 20 years. By extracting the coastline vector data of 1999, 2005, 2011 and 2017 respectively, the spatio-temporal characteristics of coastline changes on coastline length, change rate and land change area were analyzed, and the main driving factors were analyzed combined with the land use changes in the coastal swing area. The results show that: the total length of Xiamen's coastline increased from 235.16 km to 264.98 km during 1999-2017, and the land area increased from 1558.84 km2 to 1594.29 km2. The most significant changes occurred in Xiang'an district and Huli district with the coastline length increased by 16.38% during 2011-2017 and 22.14% during 1999-2005 respectively, while the changes were not very conspicuous in other areas. According to the land use changes in the coastal areas, the coastline changes in Xiamen City were mainly related to the expansion of construction land and port constructions in Haicang district, Xiang'an district and Huli district, as well as the expansion of aquaculture in the Xiang'an district.
Highlights
Coastline, the boundary of land and sea, is vulnerable to the natural processes, such as coastal erosion-accretion and sea level changes, and human activities[1,2,3].The coastline changes will directly affect the intertidal zones and wetland ecosystems, resulting in the environment evolution in coastal zone
The significant change of coastline was mainly concentrated in Haicang, Huli and Xiang'an district
The most obvious growth occurred in Xiang'an district from 2005 to 2017 and Huli district from 1999 to 2005
Summary
The boundary of land and sea, is vulnerable to the natural processes, such as coastal erosion-accretion and sea level changes, and human activities[1,2,3].The coastline changes will directly affect the intertidal zones and wetland ecosystems, resulting in the environment evolution in coastal zone. The major ongoing construction projects include: construction of Xiang 'an international airport with a planning land use of 46 km and a reclamation area of 17 km; port infrastructure constructions, such as the third stage of Wutong Ferry Terminal and the port facilities improvement of Wuyuan Bay Yacht Marina; comprehensive construction of exchange hubs for connectivity, economic-trade cooperation and cultural exchange with regions and countries along the One Belt and One Road, such as "China-Asean Maritime Cooperation Center" All of these will have a profound impact on the change of Xiamen coastline and coastal ecological environment[89]
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