Historical reconstruction of shoreline evolution at the Nam Dinh Coast, Vietnam

IF 1.9 3区工程技术 Q3 ENGINEERING, CIVIL

Coastal Engineering Journal Pub Date : 2022-05-17 DOI:10.1080/21664250.2022.2073748

Q. Nguyen Hao, S. Takewaka

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引用次数: 7

Abstract

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 The simulated shorelines agreed well with the results of carbon-14 dating analysis, the historical reference points and shoreline positions extracted from the old maps, and the recently measured shoreline change derived from Landsat imagery.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.

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越南南定海岸海岸线演变的历史重建

摘要：位于越南北部的海口，近年来遭受了严重的海岸侵蚀，后退速度达到20米/年。根据对文献的系统回顾，海口沿岸的海岸线退缩趋势与苏河的水量和输沙量下降有关，苏河在1787年的一次大洪水后被认为是活跃的，导致河道分叉和前河道废弃。使用改进的单线模型对大约一千年（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、从旧地图中提取的历史参考点和海岸线位置以及从陆地卫星图像中获得的最近测量的海岸线变化非常一致。本研究表明，海口的侵蚀从18世纪末开始，而不是像以前的一些著作所说的那样，从20世纪初开始。我们认为，河流输沙量减少和其他过程（沉降和海平面上升）的综合影响是造成海口海岸长期侵蚀的主要原因。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Coastal Engineering Journal 工程技术-工程：大洋

CiteScore

4.60

自引率

8.30%

发文量

审稿时长

7.5 months

期刊介绍： Coastal Engineering Journal is a peer-reviewed medium for the publication of research achievements and engineering practices in the fields of coastal, harbor and offshore engineering. The CEJ editors welcome original papers and comprehensive reviews on waves and currents, sediment motion and morphodynamics, as well as on structures and facilities. Reports on conceptual developments and predictive methods of environmental processes are also published. Topics also include hard and soft technologies related to coastal zone development, shore protection, and prevention or mitigation of coastal disasters. The journal is intended to cover not only fundamental studies on analytical models, numerical computation and laboratory experiments, but also results of field measurements and case studies of real projects.