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Shock-Capturing Boussinesq Modelling of Broken Wave Characteristics Near a Vertical Seawall

1
Ocean College, Zhejiang University, Zhoushan 316021, China
2
Key Laboratory of Coastal Disasters and Defense of Ministry of Education, Nanjing 210098, China
3
National Marine Hazard Mitigation Service, Ministry of Natural Resources of the People’s Republic of China, Beijing 100000, China
*
Author to whom correspondence should be addressed.
Water 2018, 10(12), 1876; https://doi.org/10.3390/w10121876
Received: 1 November 2018 / Revised: 28 November 2018 / Accepted: 12 December 2018 / Published: 19 December 2018
(This article belongs to the Section Hydraulics)
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Abstract

Broken wave characteristics in front of a vertical seawall were modeled and studied using a shock-capturing Boussinesq wave model FUNWAVE-TVD. Validation with the experimental data confirmed the capability of FUNWAVE-TVD in predicting the wave characteristics via the shock-capturing method. Compared to the results obtained from the Boussinesq model coupled with an empirical breaking model, the advantage of the present shock-capturing model for the broken waves near a vertical seawall was clearly revealed. A preliminary investigation of the effects of the key parameters, such as the incident wave height, water level at the seawall, and seabed slope, on the wave kinematics (i.e., the root mean square of the surface fluctuations and depth-averaged horizontal velocity) near the seawall was then conducted through a series of numerical experiments. The numerical results indicate the incident wave height and the water depth at the seawall are the important parameters in determining the magnitude of the wave kinematics, while the effect of the seabed slope seems to be insignificant. The role of the breaking point locations is also highlighted in this study, in which case further breaking can reduce the wave kinematics significantly for the coastal structures predominately subjected to broken waves. View Full-Text
Keywords: broken waves; vertical seawalls; Boussinesq wave model; shock-capturing methods broken waves; vertical seawalls; Boussinesq wave model; shock-capturing methods
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Liu, W.; Ning, Y.; Zhang, Y.; Zhang, J. Shock-Capturing Boussinesq Modelling of Broken Wave Characteristics Near a Vertical Seawall. Water 2018, 10, 1876.

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