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HESS - Flooding in the Mekong Delta: the impact of dyke systems on downstream hydrodynamics

hess.copernicus.org · 13,840 words · saved by 1 readers

Building high dykes is a common measure of coping with floods and plays an important role in agricultural management in the Vietnamese Mekong Delta. However, the construction of high dykes causes considerable changes in hydrodynamics of the Mekong River. This paper aims to assess the impact of the high-dyke system on water level fluctuations and tidal propagation in the Mekong River branches. We developed a coupled 1-D to 2-D unstructured grid using Delft3D Flexible Mesh software. The model domain covered the Mekong Delta extending to the East (South China Sea) and West (Gulf of Thailand) seas, while the scenarios included the presence of high dykes in the Long Xuyen Quadrangle (LXQ), the Plain of Reeds (PoR) and the Trans-Bassac regions. The model was calibrated for the year 2000 high-flow season. Results show that the inclusion of high dykes changes the percentages of seaward outflow through the different Mekong branches and slightly redistributes flow over the low-flow and high-flow

HESS - Flooding in the Mekong Delta: the impact of dyke systems on downstream hydrodynamics Articles | Volume 24, issue 1 Article Peer review Metrics Related articles Articles | Volume 24, issue 1 https://doi.org/10.5194/hess-24-189-2020 © Author(s) 2020. This work is distributed under the Creative Commons Attribution 4.0 License. https://doi.org/10.5194/hess-24-189-2020 © Author(s) 2020. This work is distributed under the Creative Commons Attribution 4.0 License. Articles | Volume 24, issue 1 Article Peer review Metrics Related articles Research article | 16 Jan 2020 Research articl

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