共查询到16条相似文献，搜索用时 125 毫秒
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鉴于双弧板式透空堤的消浪性能仍不理想，提出了一种潜堤—双弧板组合结构，并基于OpenFOAM软件建立了波浪与该结构相互作用的数值模型，采用试验结果对所建数值模型进行验证。在此基础上，讨论了该新型结构的消浪特性、波压力分布特征以及所受波浪力的影响因素。结果表明，透射系数随相对板宽的增大而减小，反射系数则相反。透射与反射系数随相对潜深的变化较为显著。当结构位于静水位上方（即相对潜深为-0.05）时，透射系数最小而反射系数最大；当结构位于静水位下方（即相对潜深为0.05）时，透射系数最大而反射系数最小。该组合结构两块弧板上下表面的正负压力变化关于横轴近似对称，不同测点处的压力值差异显著。水平波浪力与垂直波浪力的变化趋势大致相似，但垂直波浪力远大于水平波浪力。研究结果可为其工程应用提供理论指导与技术支撑。 相似文献
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为使防波堤同时具有良好的掩护效果和水体交换能力,提出了两种带有透浪通道的新型直立式防波堤。基于Fluent求解器建立了三维数值波浪水槽,通过与试验结果对比,验证了该数值水槽求解波浪与透空堤作用具有较高的精度。对两种防波堤在规则波作用下的透浪特性进行了研究,结果表明:透射系数K_t与透空率呈正线性相关,且可通过调整透浪通道间距,使相同透空率下K_t降低20%～30%。对同一结构,K_t随相对波长的增大而显著增大,但受相对波高的影响较小。在透空率大于0.16后,异型沉箱防波堤的消浪性能明显优于错位沉箱。基于数值计算结果,给出了以上两种透空堤波浪透射系数的经验公式。 相似文献
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浮式防波堤在港口海岸工程、近海工程、海洋工程和水产养殖等诸多领域有广阔的应用前景。与单浮箱式浮式防波堤相比,多浮箱式浮式防波堤可提高其消浪性能。对双浮箱式浮式防波堤进行了二维波浪物理模型试验,分析了浮箱宽度、前后浮箱连接方式、前后浮箱间距以及浮箱入水深度等因素对浮式防波堤消浪性能的影响。研究结果表明:对于单浮箱式浮式防波堤,试验范围内浮箱宽度增大一倍后消浪效果改善并不相对明显;前后浮箱刚性连接的双浮箱式浮堤的波浪透射系数均小于前后浮箱自由的双浮箱式浮堤和相同浮箱宽度的单浮箱式浮堤,浮堤消浪性能提高;由于前后浮箱相对间距太大时前后浮箱的相互作用减弱,浮堤的波浪反射系数变小,而不同前后浮箱相对间距的波能损耗系数整体上差别较小,双浮箱式浮堤的波浪透射系数整体上随着前后浮箱相对间距D/2B的增大先减小然后变大,在相对间距D/2B为1.0~1.5时双浮箱式浮堤的波浪透射系数相比最小;不同波高和波浪周期下,浮堤的波浪透射系数均随着浮箱相对入水深度的增大而减小。 相似文献
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为研究敷设消浪材料不同构造浮箱的消浪性能,通过物模试验得到规则波作用下不同周期、不同波高、不同锚泊方式及不同结构形式下浮箱的透射系数(C_t)、反射系数(C_r)及波能衰减系数(C_s)。研究结果表明:随着相对堤宽(B/L)的增大,不同构造浮箱的透射系数均逐渐减小,反射系数逐渐增大,波能衰减系数逐渐增大;敷设消浪材料的浮堤相比于单浮箱透射系数减小了0.10左右,而采用方箱-垂直板式构造的浮堤消浪性能相对于单浮箱透射系数减小了0.10～0.15,且敷设消浪材料的浮堤结构在研究的2种波高下,相对堤宽达到0.30时,透射系数可减小到0.25;当浮堤采用张紧式锚泊时,其消浪性能相对于悬链式锚泊浮堤减小了0.10左右,通过对比不同构造浮箱的消浪性能,可为实际工程设计提供参考。 相似文献
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斜坡堤典型胸墙波浪力的影响因素 总被引：2，自引：1，他引：1
为探求斜坡堤典型胸墙迎浪面所受波浪力大小的影响因素,设计前仰式、深弧式、后仰式和直立式4种结构型式胸墙进行相关的物理模型试验。通过在典型胸墙迎浪面间隔布置压力测点,获取所受波浪压力,并将其进行积分求和,得到胸墙所受波浪力,进而讨论相对波高、相对波长、斜坡坡度和胸墙结构型式对波浪力的影响。结果表明,相对波高与相对波长对胸墙所受波浪力影响显著;波浪力随着相对波高的增大而增大,随着相对波长的增大呈现先增大、后减小、再增大的变化趋势;波浪力随着斜坡坡度的增大而减小。斜坡堤弧形胸墙所受波浪力明显大于直立式胸墙所受波浪力;在斜坡堤弧形胸墙中,前仰式胸墙受力较其余两种型式胸墙受力小。研究结果将加深波浪对斜坡堤胸墙作用力的理解,为后续工程设计提供理论指导。 相似文献
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为探求斜坡堤典型胸墙迎浪面所受波浪力大小的影响因素,设计前仰式、深弧式、后仰式和直立式四种结构型式胸墙进行相关的物理模型试验。通过在典型胸墙迎浪面间隔布置压力测点获取所受波浪压力,并将其进行积分求和得到胸墙所受波浪力,进而讨论相对波高(H/d)、相对波长(L/d)、斜坡坡度和胸墙结构型式对波浪力的影响。试验结果表明：相对波高与相对波长对胸墙所受波浪力影响显著。波浪力随着相对波高的增大而增大,随着相对波长的增大呈现先增大—后减小—再增大的变化趋势。波浪力随着斜坡坡度的增大而减小。斜坡堤弧形胸墙所受波浪力明显大于直立式胸墙所受波浪力;在斜坡堤弧形胸墙中,前仰式胸墙受力较其余两种型式胸墙受力小。研究结果将加深波浪对斜坡堤胸墙作用力的理解,为后续工程设计提供理论指导。 相似文献
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在理论分析的基础上通过物理模型实验探究了规则波与簇状沉水植物群的相互作用。结果表明,植物群沿程波高衰减规律在多数情况下与Kobayashi指数形式和Dalrymple幂函数形式波高衰减理论模型吻合较好,少数情况下波高衰减集中在植物群后半部分,与上述理论模型并不一致。在植物淹没度等于0.4条件下,植物群沿程波高出现较多壅高现象,且相对壅高值随入射波高的增大而减小;植物群的规则波透射系数变化情况与入射波周期、相对波高、植物淹没度以及植物分布密度等因素相关。当入射波周期等于1.0 s时,透射系数随相对波高的增大而减小,周期大于1.0 s时,透射系数随相对波高的增大出现较强的波动性。本文提出了规则波透射系数与水动力因素及植物因素之间的关系式,得到了近岸簇状沉水植物群消浪特性的基本认识,为采用近岸植物消波护岸提供一定的理论依据。 相似文献
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圆弧板透空式防波堤消波性能试验研究 总被引：1，自引：1，他引：0
提出了一种由多层圆弧板组成的新型透空式防波堤结构,并对其在二维规则波浪作用下的消波性能进行了物理模型试验研究。在不同入射波高条件下,对圆弧板和水平板透空结构的消波性能进行了比较分析,探讨了圆弧板间距和层数对圆弧板透空式结构消波性能的影响。研究结果表明,圆弧板透空式结构的消波效果优于水平板式透空结构,在相对宽度为0.2时,可以使透射系数达0.5以下。随着圆弧板间距从0.15 m减小到0.05 m时,消波效果逐步提升,而圆弧板的层数对结构的消波性能也有一定影响。 相似文献
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LI Xue-yan WANG Qing YOU Zai-jin GUO Wei-jun ZHANG Jun-bin ZHAN Chao ZHANG Zhi-chen WANG Li-xue LI Qin 《中国海洋工程》2020,(1):89-98
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. 相似文献
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《中国海洋工程》2021,(4)
In the present study, the performance characteristics of a Savonius rotor type wave energy converter used in conjunction with a conventional double-buoy floating breakwater is investigated using physical model studies. The Savonius rotor type converter is suspended under the double-buoy floating breakwater to achieve wave attenuation while generating electricity, thereby enhancing the overall wave-elimination effect of the combination. The Savonius rotor is tested with different water submergence depths, and a reasonable relative submergence depth is determined within the scope of the research parameters. The hydrodynamics and energy capture performance of the combined breakwater with four different sizes of Savonius rotor under different wave conditions are studied, and the transmission coefficient of the experimental device is analyzed. The results show that when the optimal relative submergence depth is 0.65 D, where D is the impeller diameter, there is a correspondence between the optimal performance of Savonius rotor with different rotor sizes and the wave period and wave height. The optimal energy capture efficiency of the wave energy converter reaches 17%-20.5%, and the transmission coefficient is reduced by35%-45% compared with the conventional double-buoy breakwater. 相似文献
13.
Ching-Her Hwang 《Ocean Engineering》1988,15(3)
Experimental studies of wave transmission by overtopping for a smooth impermeable breakwater with 1:1.5 slope under both regular and random waves were conducted. A resulting relationship between the transmission coefficient (determined by wave height and wave period) and a breakwater height above mean water level normalized with the height of wave run-up measured directly by capacity wave meter is reported. Meanwhile, their discrepancies in both regular and random waves are also discussed in this study. The authors find also that the transmitted significant wave period by overtopping of random waves may be much longer than those of the incoming wave. This characteristic is especially prominent and probably creates the oscillation phenomenon in the wave basin at the back of breakwater when the breakwater height (above mean water level) to water depth ratio is greater than 0.23 and the incoming wave period is longer than 8 sec. 相似文献
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In recent years floating breakwaters are considered for creating calm basin under open sea conditions for short period of time. In this paper, experimental studies on the performance characteristics of a horizontal floating plate breakwater are presented. The results of this two-dimensional model study are for regular waves of shallow and intermediate water depths. Analysis of the results shows that the transmission coefficient is strongly influenced by wave steepness and relative length of breakwater. It is also found to be dependent, to a lesser extent, on the relative depth of draft. Mooring forces are found to increase with increasing wave steepness and relative depth of draft. The performance of this breakwater is compared with other types of breakwater reported by earlier workers. 相似文献
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基于非静压数值计算模型,本文系统研究了聚焦波作用下透水潜堤的消波特性,通过设置合理的计算工况,详细分析了波高、堤顶水深、谱峰周期、孔隙率以及堤顶宽度5种因素对透水潜堤消波特性的影响。与此同时,本文将透水潜堤的计算结果同不透水潜堤的计算结果进行了对比分析。计算结果表明:透水潜堤对聚焦波的消减作用要强于不透水潜堤,从而说明,透水潜堤能更有效地降低畸形波对海岸基础设施的影响;波高和堤顶水深是影响潜堤消波特性的重要因素,随入射波高增加、堤顶水深减小,透水潜堤对波浪的消减作用逐渐增强。透水潜堤对长周期波浪的消波效果较差。在本文考虑的孔隙率范围内,孔隙率越大,透水潜堤消波效果越好;当孔隙率为0.4,堤顶宽度为0.612 5 m时,透水潜堤可消减54%的入射波能,比不透水潜堤对入射波能的消减增加36.1%。本文研究结果可为进一步认识透水潜堤的消波特性和海岸防护工程设计提供相应的参考。 相似文献
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The wave transmission characteristics and wave induced pressures on twin plate breakwater are investigated experimentally in regular and random waves.A total of twenty pressure transducers are fixed on four surfaces of twin plate to measure the wave induced dynamic pressures.The spatial distribution of dynamic wave pressure is given along the surface of the twin plate.The uplift wave force obtained by integrating the hydrodynamic pressure along the structure is presented.Discussed are the influence of different incident wave parameters including the relative plate width B /L,relative wave height /i H a and relative submergence depth s /a on the non-dimensional dynamic wave pressures and total wave forces.From the investigation,it is found that the optimum transmission coefficient,t K occurs around B /L 0.41 ~ 0.43,and the twin plate breakwater is more effective in different water depths.The maximum of pressure ratio decreases from 1.8 to 1.1 when the relative submergence depth of top plate is increased from 0.8to +0.8. 相似文献