Journal cover Journal topic
Natural Hazards and Earth System Sciences An interactive open-access journal of the European Geosciences Union
Nat. Hazards Earth Syst. Sci., 17, 693-702, 2017
http://www.nat-hazards-earth-syst-sci.net/17/693/2017/
doi:10.5194/nhess-17-693-2017
© Author(s) 2017. This work is distributed
under the Creative Commons Attribution 3.0 License.
Research article
16 May 2017
Simulations of moving effect of coastal vegetation on tsunami damping
Ching-Piao Tsai1, Ying-Chi Chen1, Tri Octaviani Sihombing2, and Chang Lin1 1Department of Civil Engineering, National Chung Hsing University, Taichung 402, Taiwan
2Department of Civil Engineering, Maranatha Christian University, Bandung, West Java 40164, Indonesia
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.

Citation: Tsai, C.-P., Chen, Y.-C., Sihombing, T. O., and Lin, C.: Simulations of moving effect of coastal vegetation on tsunami damping, Nat. Hazards Earth Syst. Sci., 17, 693-702, doi:10.5194/nhess-17-693-2017, 2017.
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Short summary
A huge tsunami in Southeast Asia in 2004 has stimulated a debate about the role played by coastal ecosystems in protecting coastal area. Previous approaches assumed that vegetation is stationary and neglected the plant motion with wave. This may lead to overestimation of the effectiveness of coastal vegetation on tsunami damping. We present a coupled wave–vegetation simulation and conclude that the tsunami wave height damping may be overestimated if vegetation motion with wave is neglected.
A huge tsunami in Southeast Asia in 2004 has stimulated a debate about the role played by...
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