Morphological Change in the Northern Red River Delta,Vietnam |
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| Authors: | Vuong Van Bui Daidu Fan Dac Ve Nguyen Dinh Lan Tran Duc Thanh Tran Van Long Hoang Thi Hong Hanh Nguyen |
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| Institution: | 1.Institute of Marine Environment and Resources,Vietnam Academy of Science and Technology,Haiphong,Vietnam;2.State Key Laboratory of Marine Geology,Tongji University,Shanghai,China;3.Hanoi University of Mining and Geology,Hanoi,Vietnam;4.Graduate University of Science and Technology, Vietnam Academy of Science and Technology,Hanoi,Vietnam |
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| Abstract: | 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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