On Damping of Irregular Waves Passing over a Permeable Seabeds

J. Ocean Eng. Technol. 2007;21(6):34-41.

Hur Dong-Soo,Choi Dong-Seok,Lee Woo-Dong,Bae Ki-Seong

Institute of Marine Industry Department of Civil and Environmental Engineering Gyeongsang National University,Department of Civil and Environmental Engineering Gyeongsang National University,Department of Civil and Environmental Engineering Gyeongsang

해저투수층을 통과하는 불규칙파의 파랑감쇠에 관한 연구

허동수,최동석,이우동,배기성

경상대학교 토목환경공학부 해양산업연구소,경상대학교 토목환경공학부,경상대학교 토목환경공학부,경상대학교 토목환경공학부 해양산업연구소

Keywords: Two-dimensional numerical model, Permeable seabeds, Irregular waves, Wave damping, Porosity, Mean grain size

핵심용어: 2차원 수치모델, 투과성 해저지반, 불규칙파, 파랑감쇠, 공극률, 평균입경

Abstract

The present study investigates numerically damping characteristics of irregular waves passing over a permeable seabeds. At first, the numerical model, which is able to consider the flow through a porous medium with inertial, laminar and turbulent resistance terms and determine the eddy viscosity with LES turbulent model, is validated by comparing with existing experimental data. And then, the numerical test on irregular wave damping over a permeable seabeds is performed in case that wave and flume conditions are changed. It is revealed from the numerical results that the more porosity and mean grain are increased, the more wave damping is increased. Also, the effect of wave period on damping of irregular waves over a permeable seabed is discussed.