Historical reconstruction of shoreline evolution at the Nam Dinh Coast, Vietnam
Historical reconstruction of shoreline evolution at the Nam Dinh Coast, Vietnam
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DOI：
10.1080/21664250.2022.2073748
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发表时间：
2022-05
影响因子：
2.4
通讯作者：
Q. Nguyen Hao;S. Takewaka
中科院分区：
文献类型：
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作者：
Q. Nguyen Hao;S. Takewaka
摘要位于越南北部的海口近年来遭受严重的海岸侵蚀，退缩速度高达20米/年。根据对文献的系统回顾，海口岸线的衰退趋势与苏河输水减沙有关，苏河在1787年的一次大洪水后被认为是活跃的，导致了原航道的分流和废弃。使用修正的单线模型沿着这一设想对大约一千年(公元1000年至今)的海岸线演变进行了历史分析。模拟的海岸线与碳14测年分析的结果、从旧地图提取的历史参考点和海岸线位置以及从陆地卫星图像提取的最近测量的海岸线变化吻合得很好。这项研究表明，海口的侵蚀是从18世纪末开始的，而不是像以前的一些研究成果所说的那样从20世纪初开始。我们认为，河流泥沙减少和其他过程(下沉和海平面上升)的综合影响是海口海岸长期侵蚀的主要原因。
ABSTRACT Hai Hau, located in northern Vietnam, has suffered from severe coastal erosion with a retreat rate reaching 20 m/yr in recent years. Based on a systematic review of the literature, the shoreline recession trend along the Hai Hau is associated with the decline of water and sediment discharged from the So River, assumed to be active after a great flood in 1787, resulting in channel bifurcation and abandonment of the former channel. A historical analysis of the shoreline evolution of approximately a thousand years (the year 1000 – present) was conducted along this scenario using a modified one-line model. The simulated shorelines agreed well with the results of carbon-14 dating analysis, the historical reference points and shoreline positions extracted from the old maps, and the recently measured shoreline change derived from Landsat imagery. The present study demonstrates that the erosion at the Hai Hau has been ongoing from the end of the 18th century rather than the beginning of the 20th century, as proposed by some previous works. We regard the combined effects of the decrease in river sediment load, and other processes (subsidence and sea level rise (SLR)) are the major causes of long-term erosion on Hai Hau Coast.