Analysis on the Reduction Effects of the Gravity Waves and Infra-Gravity Waves of Detached Submerged Breakwater by Field Monitoring

摘要

This study was conducted to observe the effects of gravity and infra-gravity wave of detached submerged breakwater in the coast of Yeongnang-dong,Sokcho,as analyzing continuous wave data by performing field observations on the front area (W0) and rear area (W1,W2).Wave transmission coefficient (Kt) of submerged breakwater was analyzed in two parts,short-period wave (gravity wave) and infra-gravity wave.The wave energy reduction effect was analyzed and compared with the value of the design.In case of above wave height 2.0 m at the front area (W0) of the submerged breakwater,the short-period wave height at point W1 is reduced by about 65 and the short-period wave height at point W2 is reduced by about 59.The depth of crest of submerged breakwater conducted in a sea area differs from the design,and the wave energy reduction effect is analyzed to be smaller than the design plan.The infra-gravity waves were amplified to 2.11 and 1.71 at the W1 and W2 points,respectively,and the wave height at W2 point was smaller than that at W1 point.