A Numerical Study of Wave Transformation on a Permeable Structure Considering Porous Media Flow

J. Ocean Eng. Technol. 2006;20(6):35-40.

Kim, In-Chul;

Division of Architecture and Civil Engineering, Dongseo University;

투수층의 흐름을 고려한 투수성 구조물의 파랑변형에 관한 수치적 해석

김인철;

동서대학교 건축.토목시스템공학부;

Keywords: Wave transfortation, Boussinesq equation, Darcy law, Wave runup, Permeable layer, Gentle slope

핵심용어: 파랑변형, 부시네스크 방정식, 다시 법칙, 파의 처오름, 투수층, 완경사

Abstract

In recent years, there's been strong demand for seawalls that havea gentle slope and permeability that serveswater affinity and disaster prevention from wave attack. The aim of this study is to examine wave transformation, including wave run-up that propagates on the coastal structures. A numerical model based on the weak nonlinear dispersive Boussinesq equation, together with the unsteady nonlinear Darcy law for fluid motion in permeable layer, is developed. The applicability of this numerical model is examined through Deguchi and Moriwaki's hydraulic model test on the permeable slopes. From this study, it is found that the proposed numerical model can predict wave transformation and run-up on the gentle slope with a permeable layer, but can't show accurate results for slopes steeper than about 1:10.