Morphological Change in the Northern Red River Delta, Vietnam
Morphological Change in the Northern Red River Delta, Vietnam
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越南红河三角洲北部的形态变化
DOI：
10.1007/s11802-018-3777-2
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发表时间：
2018-11
影响因子：
1.6
通讯作者：
Nguyen Thi Hong Hanh
中科院分区：
文献类型：
--
作者：
Bui Vuong Van;Fan Daidu;Nguyen Dac Ve;Tran Dinh Lan;Tran Duc Thanh;Hoang Van Long;Nguyen Thi Hong Hanh
海岸侵蚀已成为全球关注的问题，特别是在人口密集的亚洲特大河流三角洲。红河三角洲南部的海岸侵蚀是一个严重的问题。基于1965-2004年的地形图和1975-2015年的陆地卫星影像，通过DEM（Digital Elevation Model）分析，对北方黄河三角洲海岸地貌变化进行了详细研究。结果表明，北方RRD的特点是在过去的几十年中，快速的海岸加积，虽然悬浮泥沙通量已下降了约60%后，1988年的Hoa Binh大坝（HBD）的完整性和相对海平面上升1.9毫米yr-1。然而，在潮下浅滩和台地的外部，在过去的二十年中，观察到的加积迅速减缓，甚至变成侵蚀。侵蚀带的再悬浮泥沙可以向陆地输送，补充内海岸带，保持后者的加积在不久的将来，以补偿来自河流的泥沙减少。然而，如果其他不利影响恶化，这种滞后效应应尽快终止，例如，拦河筑坝、海平面上升、加固风暴、围海造地等设计不当的海岸工程。沿海规划者和管理者应充分重视这些变化。
Coastal erosion has become a worldwide concern, typically in the densely populated Asian mega-river deltas. Severe coastal erosion in the southern Red River Delta (RRD) has been intensively studied. Coastal morphological change in the northern RRD was examined in detail through DEM (Digital Elevation Model) analysis based on time series of bathymetrical maps (1965–2004) and Landsat images (1975–2015) in this study. The results show that the northern RRD is featured by rapid coastal accretion in the past few decades, although suspended sediment flux has dropped by roughly 60% after the completeness of Hoa Binh Dam (HBD) in 1988 and relative sea level rose at 1.9 mm yr−1. However, accretion at the outer part of subtidal shoals and platforms was observed to slow down quickly or even turned into erosion in the last two decades. The resuspended sediments from the erosion zone can be transported landward to replenish the inner coastal zone, keeping the latter accretion in the near future to compensate for the sediment discharge decrease from the river. However, this lag effect should be terminated soon if other adverse effects go worse,e.g., damming rivers, sea-level rising, strengthening storms, land reclamation and other poor-designed coastal engineering. Coastal planners and managers should pay full attention to these changes.
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