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Water 2018, 10(8), 986; https://doi.org/10.3390/w10080986

Nonlinear Simulation of Wave Train Impact on a Vertical Seawall

State Key Laboratory of Coastal and Offshore Engineering, Dalian University of Technology, Dalian 116024, China
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Received: 24 June 2018 / Revised: 23 July 2018 / Accepted: 24 July 2018 / Published: 26 July 2018
(This article belongs to the Special Issue The Application of Hydrologic Analysis in Disaster Prevention)
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Abstract

A 2D nonlinear numerical wave flume is developed to investigate the wave train impact on a vertical seawall. Fully nonlinear kinematic and dynamic boundary conditions are satisfied on the instantaneous free surface. Cases of single-, double- and multi-crest wave trains are discussed. For single-crest wave train cases, the present nonlinear results are compared with the solution of the Serre-Green-Naghdi (SGN) model, showing good agreement. For double-crest wave train cases, the SGN model underestimates the maximum wave run-up along the vertical seawall. Compared with the linear results, the nonlinearity for double-crest cases can lead to an evident increase of the wave run-up and high-frequency free-surface oscillations. Through a fast Fourier analysis, evident nonlinear characteristics of the time series of the wave run-up and wave load during the wave impact process are confirmed. For multi-crest wave train cases, irregular wave run-ups can be observed. In some cases, the wave run-up along the vertical seawall can reach about 6 times that of the incident wave, which should be considered carefully in a practical design. View Full-Text
Keywords: nonlinear wave; wave run-up; wave impact; BEM; coastal structure nonlinear wave; wave run-up; wave impact; BEM; coastal structure
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Ning, D.; Li, X.; Zhang, C. Nonlinear Simulation of Wave Train Impact on a Vertical Seawall. Water 2018, 10, 986.

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