腔体共振型浮式防波堤消波性能试验

Wave Absorbing Performance Test of Cavity Resonance Type Floating Breakwater

采用Helmholtz共振腔原理设计腔体共振型浮式防波堤,通过设计合理的腔体结构,使外部波浪与腔内流体共振,从而耗散波能,有效提升对长周期波浪的消波效果。通过试验方法对4个不同底部间隙的腔体共振型和1个传统方型浮式防波堤模型进行分析和比较,重点研究不同波高和周期下的透射系数、运动响应和系泊力。结果表明:腔体共振型浮式防波堤能有效克服传统方型浮式防波堤在长周期消波应用中存在的技术缺陷。同时,在相同主尺度下,相比传统方型浮式防波堤,间隙堤宽比为0.3的腔体共振型浮式防波堤在长周期波中的透射系数可减少15%~20%。

A cavity resonance type floating breakwater is designed based on the Helmholtz resonator principle.By designing a reasonable cavity structure,the external wave resonates with the fluid in the cavity,thus attenuating the wave energy and effectively improving the wave attenuation effect of long-period waves.For this purpose,the cavity resonance model with four different gap distances at the bottom and one traditional box-type floating breakwater model are analyzed and compared.The transmission coefficient,motion response and mooring force at different wave heights and periods are studied.The results show that the cavity resonance type floating breakwater can effectively overcome the technical defects of the traditional box-type floating breakwater in the application of long-period wave attenuation.At the same time,under the same principal scale,the long-period wave transmission coefficient of the cavity resonance floating breakwater with the ratio of gap-to-width of 0.3 can be reduced by 15%to 20%compared with that of the traditional box-type floating breakwater.