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wave attenuation performance and the Influencing Factors of A Lower Arc-Plate Breakwater

China Ocean Engineering 2020年第1期34卷 89-98页

作者： LI Xue-yan WANG Qing YOU Zai-jin GUO Wei-jun ZHANG Jun-bin ZHAN Chao ZHANG Zhi-chen WANG Li-xue LI Qin Coast Institute Ludong UniversityYantai 264025China Dalian Maritime University Dalian 116026China Institute of Sea-Crossing Engineering Ludong UniversityYantai 264024China College of Environmental Sciences and Engineering Dalian Maritime UniversityDalian 116026China

Comprehensive experimental and numerical studies have been undertaken to investigate wave energy dissipation performance and main influencing factors of a lower arc-plate breakwater. The numerical model, which considers nonlinear interactions between waves and the arc-plate breakwater, has been constructed by using the velocity wave- generating method, the volume of fluid (VOF) method and the finite volume method. The results show that the relative width, relative height and relative submergence of the breakwater are three main influencing factors and have significant influence on wave energy dissipation of the lower arc-plate open breakwater. The transmission coefficient is found to decrease with the increasing relative width, and the minimum transmission coefficient is 0.15 when the relative width is 0.45. The reflection coefficient is found to vary slightly with the relative width, and the maximum reflection coefficient is 0.53 when the relative width is 0.45. The transmission and reflection coefficients are shown to increase with the relative wave height for approximately 85% of the experimental tests when the relative width is 0.19 0.45. The transmission coefficients at relative submergences of 0.04, 0.02 and 0 are clearly shown to be greater than those at relative submergences of 0.02 and 0.04, while the reflection coefficient exhibits the opposite relationship. After the wave interacts with the lower arc-plate breakwater, the wave energy is mainly converted into transmission, reflection and dissipation energies. The wave attenuation performance is clearly weakened for waves with greater heights and longer periods.

关键词： arc-plate breakwater wave attenuation performance influencing factors VOF method

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Experimental Study on wave attenuation performance of A New Type of Floating Breakwater with Twin Pontoons and Multi Porous Vertical Plates

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China Ocean Engineering 2022年第3期36卷 384-394页

作者： SHEN Yu-sheng PAN Jun-ning ZHOU Yi-ren WANG Xing-gang River and Harbour Engineering Department Nanjing Hydraulic Research InstituteNanjing 210029China State Key Laboratory of Hydrology-Water Resources and Hydraulic Engineering Nanjing 210024China

A floating breakwater(FB)has extensive potential applications in the fields of coastal,offshore,and ocean engineering owing to its advantages such as eco-friendliness,low cost,easy and rapid construction,and quick dismantling and *** FB composed of twin pontoons and multi-porous vertical plates is proposed to improve the wave attenuation *** wave attenuation performance is investigated for different FB structures and vertical plate types under different incident wave heights and periods using 2D wave physical model tests in a wave *** results demonstrate that the proposed FB has a better performance than that of the conventional single pontoon-type *** reduces the wave transmission due to its enhanced wave reflection and energy *** wave transmission coefficient of the proposed FB decreases with an increase in the number of layers and relative draft depth of the vertical ***,a further decrease in the wave transmission coefficient is not observed when the number of porous vertical plates is increased from 4 to 5 *** equation has been derived to predict the wave transmission of the proposed FB based on the experimental results.

关键词： Floating breakwater twin pontoons porous vertical plates layer numbers relative draft wave attenuation performance experimental model test

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