| The spatial and temporal distribution vectors of coastline in the study area were obtained by using the remote sensing images of Tieshan Bay in Guangxi in 1995, 2001, 2007, 2010, 2015 and 2021 combined with GIS artificial visual interpretation method. The length of five types of coastlines, such as artificial construction coastline, sandy/silt muddy coastline, aquaculture coastline, angrove coastline and protected area coastline, was calculated. The spatial and temporal variation characteristics of coastline were reflected by coastline structure ratio and coastline intensity change index, and the driving factors affecting coastline change were explored. The results show that the coastline length of Tieshan Bay increased year by year from 1995 to 2021, with a total increase of 82 km in 27 years. In terms of time, the fastest growth year occurred between 2007 and 2015, with a total increase of 48 km, accounting for 58% of the total. From the perspective of shoreline types, the growth rate of aquaculture shoreline was the fastest from 1995 to 2002, and the change index of shoreline intensity was 15.05. The sandy/silty muddy shoreline slowed down the fastest from 1995 to 2002, and the change index of shoreline intensity was -5.51. The aquaculture shoreline and mangrove shoreline showed a trend of increasing first and then decreasing and decreasing first and then increasing respectively. The shoreline of the reserve experienced a growth spurt between 2007 and 2010 and has since remained relatively stable.According to the comprehensive analysis, human activities such as port construction, reclamation of tidal flats and construction of aquaculture ponds are the main driving factors of coastline changes. |
