NUMERICAL EXPERIMENTS AROUND COASTAL STRUCTURES WITH CONSIDERING STEADY FLOWS, OSCILLATORY FLOWS AND STRATIFICATION

Abstract

 This study conducted numerical experiments using a high-resolution numerical simulator to investigate ocean physical structures around coastal structures with considering stratification. To evaluate the effect of coastal structure’s layouts on ocean physical structures, three layout types of cylindrical objects with diameter of 500 m were considered: (1) single cylinder (SC), (2) two cylinders parallel to the flow direction (TCsPl) and (3) two cylinders perpendicular to the flow direction (TCsPerp). The model was forced by steady flows and tidally oscillating flows with M₂ frequency. Under the steady flow conditions, vortex motions were higher for the two cylinders cases than those for the single cylinder case. The intensity of vorticity was not largely different between TCsPl and TCsPerp under the steady flow conditions. Under the oscillating flow conditions, vortex motions were highest for the TCsPl case. Vertical mixing was especially enhanced for the cases of TCsPerp under the both flows conditions. This study suggests that the number and layout of coastal structures influence on oceanic physical structures.