Abstract
Abstract. A coupled wave–vegetation simulation is presented for the moving effect of the coastal vegetation on tsunami wave height damping. The problem is idealized by solitary wave propagation on a group of emergent cylinders. The numerical model is based on general Reynolds-averaged Navier–Stokes equations with renormalization group turbulent closure model by using volume of fluid technique. The general moving object (GMO) model developed in computational fluid dynamics (CFD) code Flow-3D is applied to simulate the coupled motion of vegetation with wave dynamically. The damping of wave height and the turbulent kinetic energy along moving and stationary cylinders are discussed. The simulated results show that the damping of wave height and the turbulent kinetic energy by the moving cylinders are clearly less than by the stationary cylinders. The result implies that the wave decay by the coastal vegetation may be overestimated if the vegetation was represented as stationary state.
Highlights
A huge tsunami in Southeast Asia caused catastrophic damage and claimed more than 200 000 people in December 2004
This study presents a numerical simulation that consider vegetation motion coupled with tsunami waves to investigate the wave-damping performance
The moving cylinders induced by waves are set up by the general moving object (GMO) model for coupling the cylinder’s motion and fluid flow dynamically
Summary
A huge tsunami in Southeast Asia caused catastrophic damage and claimed more than 200 000 people in December 2004. Huang et al (2011) performed both experiments and a numerical model by considering solitary wave propagation on emergent rigid cylinders and found that dense cylinders may reduce the wave transmission because of the increased wave energy dissipation into turbulence in cylinders By using both direct numerical simulation and a macroscopic approach, Maza et al (2015) simulated the interaction of solitary waves with emergent rigid cylinders based on the arrangement of laboratory experiments of Huang et al (2011). We model the motion of the vegetation by attaching rigid cylinders to torsional connectors under wave action, which is similar to the experimental work of Kazemi et al (2015). This is a simplified way to represent some movements of mangroves induced by sediment scour, tilting, or uprooting states.
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