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Numerical Simulation of a Deep-Scour Hole in a Tidal River Confluence Using Delft 3D

Author(s): Wenhong Dai, Ahmed Bilal, Qiancheng Xie, Yanyan Zhai

Linked Author(s): Ahmed Bilal

Keywords: Tidal channel confluences, deep-scour hole, Delft 3D, hydrologic modeling, Sanjiangkou

Abstract: River confluences have complex hydrodynamic and sediment transport behavior. Research on the interactions including flow, sedimentation and river bed morphology at con?uences has long been neglected to some degree in the past years, especially in the tidal river channel con?uences. The deep-scour hole is a standard feature of both fluvial and tidal channel confluences. Numerical simulation of the deep-scour hole at tidal channel confluence has not been carried out before as per authors� knowledge. In this study, a tidal channel confluence, namely Sanjiangkou zone, is numerically modeled with a focus to simulate hydrodynamics and deep-scour hole propagation. Sanjiangkou zone is in the Zhejiang Province of China, where two upstream rivers, Yao River and Fenghua River, merge into a downstream river called Yong River. Delft-3D code is applied to simulate the deep-scour hole study. A regular orthogonal grid is used to carry out the simulation. Numerical results are compared with observed measurements. The study indicates that Delft-3D model is useful for simulating a deep-scour hole at tidal river confluences. Such techniques may also be useful in other similar cases

DOI:

Year: 2017

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