Numerical Analysis of Nonlinear Wave Characteristics Under Porous Sloped-Seabed Conditions

Abstract

Min, E.-H. and Koo, W., 2021. Numerical analysis of nonlinear wave characteristics under porous sloped-seabed conditions. In: Lee, J.L.; Suh, K.-S.; Lee, B.; Shin, S., and Lee, J. (eds.), Crisis and Integrated Management for Coastal and Marine Safety. Journal of Coastal Research, Special Issue No. 114, pp. 116–120. Coconut Creek (Florida), ISSN 0749-0208. The characteristics of nonlinear wave attenuation were analyzed under porous sloped-seabed conditions. Nonlinear wave propagation was simulated in the time domain using a two-dimensional fully nonlinear numerical wave tank (NWT). The NWT technique was based on the boundary element method and consisted of two computational domains: A fluid domain and a porous seabed domain. To account for the wave-porous subsea interaction, the boundary value problem was solved in each domain, and the calculated values were exchanged at the interface boundary between the fluid domain and the porous domain at each time step. The shoaling coefficients for wave propagation on a sloped-seabed were calculated, and the attenuation of the waves due to interaction with the porous bottom was investigated. Waves traveling to the coast were decomposed into each frequency component, and the magnitude of the wave attenuation ratio for each component was compared. The characteristics of wave propagation according to the permeability coefficients on the seabed, wave steepness, and wave periods were also investigated.