期刊
REMOTE SENSING
卷 14, 期 10, 页码 -出版社
MDPI
DOI: 10.3390/rs14102476
关键词
coastline dynamics; Landsat archive; sub-pixel coastline extraction; time series; hotspot analysis; Google Earth Engine
类别
资金
- German Ministry of Education and Research (BMBF) [01LE1905A1]
This study analyzed the dynamics of Vietnam's coastline from 1986 to 2021 using Landsat archives and Google Earth Engine. The results showed that half of Vietnam's coastline did not experience significant change, while the other half exhibited erosion and accretion. The areas with the highest change rates were located in the delta regions of major rivers, and the erosion rates may be related to human activities.
Vietnam's 3260 km coastline is densely populated, experiences rapid urban and economic growth, and faces at the same time a high risk of coastal hazards. Satellite archives provide a free and powerful opportunity for long-term area-wide monitoring of the coastal zone. This paper presents an automated analysis of coastline dynamics from 1986 to 2021 for Vietnam's entire coastal zone using the Landsat archive. The proposed method is implemented within the cloud-computing platform Google Earth Engine to only involve publicly and globally available datasets and tools. We generated annual coastline composites representing the mean-high water level and extracted sub-pixel coastlines. We further quantified coastline change rates along shore-perpendicular transects, revealing that half of Vietnam's coast did not experience significant change, while the remaining half is classified as erosional (27.7%) and accretional (27.1%). A hotspot analysis shows that coastal segments with the highest change rates are concentrated in the low-lying deltas of the Mekong River in the south and the Red River in the north. Hotspots with the highest accretion rates of up to +47 m/year are mainly associated with the construction of artificial coastlines, while hotspots with the highest erosion rates of -28 m/year may be related to natural sediment redistribution and human activity.
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