공진방파제를 이용한 항만부진동의 저감

Abstract

Most of regular shaped harbors are confronted with harbor oscillation problem more or less. We often try to design the costal harbor such that whatever waves are unavoidable do not amplify. However, it is difficult to prevent the arrival of long waves causing oscillation with a harbor. This study deals with the reduction of harbor oscillation adopting the resonant breakwater outside the harbor entrance. Prior to the numerical model investigation on wave agitation in a harbor, the records of long wave are analyzed and theoretical and physical model approaches to the reduction of oscillations in a harbor are also introduced.

Numerical method used here are fairly standard form from the extended mild slope equation. Hybrid element model is based on a variational formulation of the boundary value problem. In this formulation an analytical solution is coupled with the finite element solution at the open boundary.

Formed numerical model is then applied to both Busan Coastal Area and Gamcheon Harbor design plan. The numerical results are obtained in terms of wave periods and directions. General discussions and comparisons are made between the measurements and the calculations. The adopted reduction scheme is found to be reliable and excellent in reduction of amplification in the harbor.