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research-article

Numerical Investigation of Sediment Transport of Sandy Beaches by Tsunami-like Solitary Wave Based on Navier-Stokes Equations

[+] Author and Article Information
Cheng Liu

TianShou Street NO. 80, Tianhe District Guangzhou, 510611 China jacklc2004@163.com

Xiaojian Liu

TianShou Street NO. 80, Tianhe District Guangzhou, Guangdong 510611 China lxiaojian2010@163.com

Changbo Jiang

#960, Section 2, South Wanjiali Rd Changsha, Hunan 410114 China jiangchb@csust.edu.cn

Yong He

TianShou Street NO.80, TianHe District Guangzhou, Guangdong 510611 China heyongwhu@126.com

Bin Deng

#960, Section 2, South Wanjiali Rd Changsha, Hunan 410114 China dengbin07@csust.edu.cn

Zihao Duan

No.11, Datun Road, Chaoyang District Beijing, 100101 China duanzh.18b@igsnrr.ac.cn

Zhiyuan Wu

#960, Section 2, South Wanjiali Rd Changsha, Hunan 410114 China zwu@csust.edu.cn

1Corresponding author.

Contributed by the Ocean, Offshore, and Arctic Engineering Division of ASME for publication in the Journal of Offshore Mechanics and Arctic Engineering. Manuscript received October 15, 2018; final manuscript received April 2, 2019; published online xx xx, xxxx. Assoc. Editor: Xinshu Zhang.

ASME doi:10.1115/1.4043504 History: Received October 15, 2018; Accepted April 03, 2019

Abstract

To improve our current understanding of tsunami-like solitary waves interacting with sandy beach, a nonlinear 3D numerical model based on the CFD tool OpenFOAM® is firstly self-eveloped to better describe the wave propagation, sediment transport and the morphological responses of seabed during wave runup and drawdown. The Finite Volume Method (FVM) is employed to discretize the governing equations of Navier-Stokes equations, combining with an improved VOF method to track the free surface and a k-ε model to resolve the turbulence. The computational capability of the hydrodynamics and sediment transport module is well calibrated by laboratory data from different published references. The results verify that the present numerical model can satisfactorily reproduce the flow characteristics, and sediment transport processes under tsunami-like solitary wave. The water-sediment transport module is then applied to investigate the effects of prominent factors, such as wave height, water depth, and beach slope in affecting beach profile change. Finally, a dimensionless empirical equation is proposed to describe the transport volume of onshore sediment based on simulation results, and some proper parameters are recommended through the regression. The results can be significantly helpful to evaluate the process of transported sediment by a tsunami event.

Copyright © 2019 by ASME
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