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.
Highlights
Vertical seawalls are commonly used for coastal protection
In rough sea conditions where extreme waves exist, seawall is periodically impacted by shoaling waves, accompanied by high wave run-ups and hydrodynamic loads
Carbone et al [21] observed in their numerical simulations that analyzed the solitary wave action on a vertical seawall using time-domain boundary element method (BEM), where waves acting a multi-crest wave train canshowed produce higher wave run-ups vertical compared on the vertical seawall stronger nonlinearity compared on witha those on anwall, inclined wall
Summary
Vertical seawalls are commonly used for coastal protection. In rough sea conditions where extreme waves exist, seawall is periodically impacted by shoaling waves, accompanied by high wave run-ups and hydrodynamic loads. Carbone et al [21] observed in their numerical simulations that analyzed the solitary wave action on a vertical seawall using time-domain BEM, where waves acting a multi-crest wave train canshowed produce higher wave run-ups vertical compared on the vertical seawall stronger nonlinearity compared on witha those on anwall, inclined wall. Anof unusual amplification of the wave run-up simulations, the Serre-Green-Naghdi (SGN) model, which satisfies a weak dispersion relationship, was found, the HOS model was still limited to the expansion of nonlinear terms in was adopted [22,23,24,25], which loses accuracy in water of finite depth for high amplitudes [26]. According to their this aprocess shows very strong et al [27] further investigated a modulated multi-crest wave studies, train impacting vertical seawall using nonlinearity. Strong nonlinear characteristics of wave run-ups and loads on the vertical are further investigated
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