Revealing riverbed morphological evolution in river system with complexity: The Vietnam Mekong River case study

Nguyen, Tanh T. N.; Shih, Dong-Sin; Chua, Leok Poh; Nguyen, Linh; Ha, Linh H.; Ngo, An T.; Luu, Ninh V.; Huynh, Thai V.; Duong, Linh M.; Tran, Chau Ngoc

doi:10.1016/j.jhydrol.2022.128897

Cited by 7 publications

(1 citation statement)

References 27 publications

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“…Even so, only a few research works have comprehensively assessed the flow dynamics at a large scale. A typical research revealing riverbed morphological evolution was conducted by [27], in which they simulated riverbed changes in Vam Nao conjunction, which is tidal-influenced and free from sand mining, and in which they experienced riverbank failures. It must be stressed that overland flow and water exchange between irrigation compartments influence delta conditions [28] in ways that cannot be simulated by 1D models.…”

Section: Introductionmentioning

confidence: 99%

The Multi-Channel System of the Vietnamese Mekong Delta: Impacts on the Flow Dynamics under Relative Sea-Level Rise Scenarios

Le,

Nguyen,

Gratiot

et al. 2023

Water

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The Mekong Delta has the world’s third-largest surface area. It plays an indisputable role in the economy and livelihoods of Vietnam and Cambodia, with repercussions at regional and global scales. During recent decades, the Vietnamese part of the Mekong Delta underwent profound human interventions (construction of dykes and multi-channel networks), which modified the hydrodynamic regime, especially cycles of field submersion. In this study, we first applied a full 2D numerical hydraulic model, TELEMAC-2D, to examine the effects of the complex channel and river networks on the spatial and temporal distribution of the flow in the 40,000 km2 of the Vietnamese Mekong Delta. Then, two scenarios of relative sea-level rise in 2050 and 2100 were implemented to simulate the future patterns of water fluxes in the delta. The results show that dykes and multi-channel networks would reduce the inundation area by 36% and lessen the peak water level by 15% and the discharge over the floodplains by 24%. Despite this protection, under a relative sea-level rise of 30 cm and 100 cm, the maximum flooded area could occupy about 69% and 85% of the whole delta in 2050 and 2100, respectively.

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Section: Introductionmentioning

confidence: 99%

The Multi-Channel System of the Vietnamese Mekong Delta: Impacts on the Flow Dynamics under Relative Sea-Level Rise Scenarios

Le,

Nguyen,

Gratiot

et al. 2023

Water

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Evolution of riverbed morphology in a main‐stem river due to management of sediment source areas

Yang,

Zhong

et al. 2024

Earth Surf Processes Landf

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The evolution of riverbeds is greatly impacted by changes in the water–sediment relationship resulting from the movement of debris flows. However, little is known about the influence of management in chronic sediment source areas on the evolution of main‐stem riverbed morphology. In this study, we used multi‐source remote sensing images covering the past 50 years along with water–sediment and topographic data from a river basin, and sediment transport data from debris flows, to analyze the evolutionary processes of the middle and lower reaches of the Daying River (DYR) at the China‐Myanmar border. Our results showed that (1) management of the sediment source area shifted the riverbed morphology from aggradation to erosion, transforming the river surface from wide and shallow to narrow and deep, and the channel from multi‐threaded to single‐threaded; (2) the active alluvial area, marginal bar area, and average river width exhibited an inverted V‐shaped trend, increasing by at least 23% and then decreasing by more than 59%; and (3) the evolution of riverbed morphology contributed to the stability of downstream riverbeds, improved flood control, and enhanced utilization of the floodplains.

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Dynamic response of flood risk in urban-township complex to future uncertainty

Xu,

Yang,

Wang

et al. 2024

International Journal of Disaster Risk Reduction

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Revealing riverbed morphological evolution in river system with complexity: The Vietnam Mekong River case study

Cited by 7 publications

References 27 publications

The Multi-Channel System of the Vietnamese Mekong Delta: Impacts on the Flow Dynamics under Relative Sea-Level Rise Scenarios

The Multi-Channel System of the Vietnamese Mekong Delta: Impacts on the Flow Dynamics under Relative Sea-Level Rise Scenarios

Evolution of riverbed morphology in a main‐stem river due to management of sediment source areas

Dynamic response of flood risk in urban-township complex to future uncertainty

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