Abstract
The numerical modeling of sediment transport under wave impact is challenging because of the complex nature of the triple wave–structure–sediment interaction. This study presents three-dimensional numerical modeling of sediment scouring due to non-breaking wave impact on a vertical seawall. The Navier–Stokes–Exner equations are approximated to calculate the full evolution of flow fields and morphodynamic responses. The bed erosion model is based on the van Rijn formulation with a mass-conservative sand-slide algorithm. The numerical solution is obtained by using a projection method and a fully implicit second-order unstructured finite-volume method in a σ-coordinate computational domain. This coordinate system is employed to accurately represent the free-surface elevation and sediment/water interface evolution. Experimental results of the velocity field, surface wave motion, and scour hole formation hole are used to compare and demonstrate the proposed numerical method’s capabilities to model the seawall scour.
Highlights
Nowadays, vertical and impermeable seawalls are still in service in many places as coastal defenses
In order to simulate sediment scouring because of wave–structure–sediment interactions, in this paper, we extend a finite volume method based on unstructured grids (UFVM)
This paper presents a three-dimensional numerical model to simulate the scour under wave impact on vertical seawalls
Summary
Vertical and impermeable seawalls are still in service in many places as coastal defenses These structures amplify the wave height and provoke local erosion at the toe seawall lowering the beach profile [1]. Sediment scouring due to wave impacts in these structures is still an essential subject to study for economic issues and for understanding physical processes and optimizing new designs. This phenomenon’s numerical and experimental modeling is a challenging task because of the complex nature wave, structure, and sediment bed interactions. High-resolution data were obtained by employing advanced and non-intrusive measuring techniques, which combined Particle Image Velocimetry (PIV), Planar Laser-Induced Fluorescence (PLIF), and Echo-Doppler Imaging
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