The effect of reducing sediment load on alluvial erosion process of the upstream Mekong Delta in Vietnam

Bay T Nguyen*1), Kim T Tran 2), Nga N Q Tra 3)

1,3) Faculty of Civil Engineering, HCMC University of Technology, Vietnam

2)Faculty of Island Marine Resource Management, University of Natural Resources and Environment, Vietnam




Hydropower development in the upstream Mekong countries has reduced the amount of sediment moving in the Mekong Delta in Vietnam. The reducing of sediment leads to the imbalance of sediment, as a consequence, riverbank erosion happening severely creates a range of effect to people’s livelihoods and economic development. Looking at more detail, the authors apply Mike 21 model to simulate bed change under the influence of sediment deficiency from upstream. The results show that when the amount of sediment is reduced significantly, the conduction is seriously eroded. Although this study is just a case of a depleted sediment upstream, it not only provides a detailed view of the effect of sediment deficiency on bed change but also contributes to forecast the risk of bank failure when the upstream hydropower projects are rushing.

Keywords: Mekong Delta; sediment deficiency; bed change; erosion.Eng_Fullpp_RCEnvE-2018_reducing sediment