\r高喜峰，王洪树，贺 铭，徐万海\r
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AuthorsHTML:\r高喜峰，王洪树，贺 铭，徐万海\r
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AuthorsListE:\rGao Xifeng，Wang Hongshu，He Ming，Xu Wanhai\r
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AuthorsHTMLE:\rGao Xifeng，Wang Hongshu，He Ming，Xu Wanhai\r
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Unit:\r天津大学水利工程仿真与安全国家重点实验室，天津 300350\r
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Unit_EngLish:\rStake Key Laboratory of Hydraulic Engineering Simulation and Safety，Tianjin University，Tianjin 300350，China\r
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Abstract_Chinese:\r淹没水平板借助上部波浪破碎、端部涡旋脱落、底部脉动回流等机理能够较好地抵御波浪入侵，是一种富有开发价值的透空型防波堤．然而淹没水平板多采用桩柱支撑，结构高程不随潮位的变化而改变．在潮差较大的海域，低潮位时水平板可能位于水面以上，而高潮位时其浸没深度又可能过大，两种情况下水平板防波堤均不能有效抵御波浪．为此，本文探讨如何设置双层水平板防波堤来削弱潮位变动对消浪性能的不利影响．研究基于光滑粒子流体动力学(SPH)方法进行，首先建立了模拟波浪与淹没水平板相互作用的二维数值波浪水槽，接着以文献中记录的物理模型实验为目标，重现了孤立波和规则波与单层淹没水平板的相互作用过程．数值计算得到的波面形态、结构波浪力、基倍频波浪透射系数均与实测结果吻合较好．随后应用验证过的数学模型，对单层水平板和两种形式的双层水平板的消浪性能进行了比较．一方面展现出在变潮位环境下采用双层水平板的必要性，另一方面从所提出的两种双层水平板设置方案中确定出较优的形式．进一步地，综合对波浪透射系数和水平板垂向波浪力的分析，得出双层水平板防波堤的最佳板间距．研究结果表明，在高低潮位下各设置一层水平板所组合而成的双层水平板防波堤能够有效克服潮位变动对消浪性能的不利影响，且双层水平板的最佳板间距宜与潮差相等．\r
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Abstract_English:\rOn the help of the wave breaking above，the vortex shedding at the ends，and the pulsating flow beneath，a submerged horizontal plate attenuates incident water waves passing over the plate and becomes an exploitable open-type breakwater. However，restrained by piles，the elevation of the plate remains unchanged during tidallevel fluctuations. In case of a large tidal range, the plate may be exposed above the low-tidal water surface，but at high tide，the submergence of the plate can be large. Both situations are unfavorable for the wave attenuation performance of the submerged horizontal plate breakwater. In this regard，the method of designing a twin-plate system to weaken the adverse effect of tidal-level variation is discussed. Based on the smoothed particle hydrodynamics (SPH) method, a 2D numerical wave tank (NWT) was first built. Following available experiments in the literature，the NWT was used to reproduce solitary wave as well as regular wave interaction with single submerged horizontal plates. The wave profiles，wave forces，and fundamental- and high-order wave transmission coefficients obtained by numerical calculation agree well with the measured results. The validated SPH model was applied to compare the wave transmission coefficients between a single-plate and two twin-plate systems with different configurations. The necessity of using a twin-plate system in the tidal-level varying environment was confirmed. Additionally，the superior configuration out of the two proposed twin-plate systems was determined. Furthermore，the optimal spacing between the twin-plates was determined by comprehensive analysis of the wave transmission coefficient and vertical wave force. The results indicate that a twin-plate system with one plate below the low water level and the other between the low and high water levels can effectively cope with the tidal-level variation. The vertical spacing between the twinplates is recommended to be equal to the tidal range.\r
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Keyword_Chinese:淹没水平板；潮位；波浪透射系数；波浪力；薄壁结构；光滑粒子流体动力学\r

Keywords_English:submerged horizontal plate；tidal-level；wave transmission coefficient；wave force；thin-wall structure；smoothed particle hydrodynamics(SPH)\r


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