Response Analysis of the Slit Type Coastal Structures Under Waves And Currents

In order to improve water quality in the harbor together with the wave absorption, the slit type breakwater and seawall were developed. Laboratory experiments have been performed to investigate the weak reflection of regular and random water waves over a train of protruded permeable shore structures and compared for reflecting and transmitting capabilities for incident waves. Revised section plans were tested for field conditions, too. The final design of the cylindrical slit type coastal structures and the alternatives were employed to the numerical model to analyze for the combined impact of waves and current on a single breakwater and a breakwater gap. The impact of field construction of the design was analyzed by wave, tidal current, and water exchange models in the harbor. Although the water exchange ratio has shown small for the design under a single discharge of suspended solid particles for the period of 15days, the actual phenomena under more severe condition with the continuous discharge of particle sources would show much improved for the slit type. At the same time, wave reflection at the windward of breakwater was reduced and tranquility inside harbor was within a permissible range. Recently, the optimum design of prototype and alternative through a series of studies were successfully applied to the beaches and fishery harbors in the southeast coast of Korea, and these structures were very stable when the typhoons attacked to these places last year.