Abstract
Controlling the flow and bed morphology in a river confluence is important in training and navigation works. The flow in river confluence is highly complex due to crucial and rapid changes associated with flow dynamics, sediment transport, and geomorphology. The flow in Malaysia’s rivers has many confluence junctions in natural drains of catchment areas. The confluence between Kurau and Ara Rivers, in Perak, Malaysia, is selected to investigate the scour hole that usually forms in the erosion zone and the bar that forms in the deposition zone. A 2D numerical model is used in simulating hydro-morpho dynamics in the rivers confluence to mitigate the erosion and deposition zones by adopting vanes as control structures. Simulation results suggest that the most effective location, dimension, and angle of vanes can be decided based on their performance in scouring and deposition zones. The distribution velocity and flow vectors can help in deciding the location of the vanes.
Highlights
River confluence is important component of fluvial systems
A 2D numerical model was used in this work to simulate the hydro-morpho dynamics of the natural confluence of Kurau and Ara Rivers in Perak, Malaysia
Vanes were proposed to control the scouring and deposition zones that usually exist in natural river confluences
Summary
River confluence is important component of fluvial systems. Confluence results from the conjunction of separate flowing rivers, and this phenomenon produces a complex hydro-morpho dynamic environment [1]. The erosion zone involves a morphological process that usually occurs at the beds and outer banks of the river confluence and is known as the scouring hole, which is caused by high velocities. Vanes have been proposed as control structures to mitigate scouring and deposition zones and improve the hydro-morphological characteristics thePEER river confluence site. Significance used efficiently for unsteady mobile bed conditions The significance this studyThe is attributed to of this study is of attributed the simulation of various scenarios for controlling and vanes deposition the simulation various to scenarios for controlling scour and deposition zonesscour by using and zones by usingthevanes and recommended the best solution thatand provides minimum scouring and recommended best solution that provides minimum scouring deposition zones and enhances deposition zones and enhances river flow dynamics
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