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首页> 外文期刊>Journal of Marine Environmental Engineering >Regular-Irregular Wave Pressures on a Semi-Immersed Breakwater
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Regular-Irregular Wave Pressures on a Semi-Immersed Breakwater

机译：半浸没式防波堤上的规则-不规则波压

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In the present study, the hydrodynamic interaction of regular and irregular waves with a semi-immersed breakwater is examined experimentally in a large-scale facility. The experiments were conducted in the wave flume of Laboratori d'Enginyeria Marvtima (LIM) at Universitat Politecnica de Catalunya (UPC) in Barcelona. The wave pressures and the vertical force acting on the structure are examined. Experimental results concerning wave energy reflection-transmission-dissipation are also presented. Two different configurations are examined: a) fixed semi-immersed breakwater and b) heave motion semi-immersed breakwater. Wave energy reflection-transmission-dissipation analysis reveals that the heave motion model performs in a dis-sipative manner contrary to the fixed breakwater, which performs in a reflective manner. It is deduced that maximum pressures are exerted on the seaward submerged edge of the structure, while the pressures acting on the seaward vertical face of the structure are much higher than the corresponding pressures acting on the downstream vertical face, due to wave energy dissipation. It was also revealed that wave-induced hydraulic pressures at the bottom were dependent on the wave height and the wavelength. Detailed uplift pressure measurements reveal the uplift pressure distribution acting on the submerged keel of the breakwater for both configurations examined. Due to the complex shape of the uplift pressure distribution, it is noted that it should be at least be digitized by four points in order to finally produce, after integration, the uplift force acting on the breakwater. Hydraulic pressures linearly increased according to the wave height. Concerning the influence of wave length, hydraulic pressures acting on the fixed breakwater present a maximum, around a value of 0.08 for B/L=d/L, decreasing almost linearly for higher values of B/L=d/L. The inverse phenomenon is observed in the case of the heave motion breakwater, concerning the influence of wave length. For higher values of B/L=d/L (lower L values), pressure increased almost linearly. It is deduced that the vertical force acting on the fixed structure is 11 % on average higher than the corresponding one acting on the heave motion breakwater. Quasi standing waves are observed in the seaward face of the breakwater in the case of regular waves for both fixed and heave-motion models. Slightly breaking waves are observed in the seaward face of the breakwater in the case of irregular waves for both fixed and heave-motion models. Wave spectral analysis in front of the structure reveals the existence of higher harmonics only in the case of irregular waves confirming the existence of slightly breaking waves in front of the structure. That is why irregular waves result in the production of a slight breaking impact waves on the structure with higher pressures and forces.
机译：在本研究中，在大型设施中通过实验检查了规则波和不规则波与半浸入式防波堤的流体动力相互作用。该实验是在巴塞罗那加泰罗尼亚理工大学（UPC）的实验室实验室Marvintima（LIM）波浪槽中进行的。检查作用在结构上的波浪压力和垂直力。还给出了有关波能反射-透射-耗散的实验结果。检查了两种不同的配置：a）固定的半浸入式防波堤和b）升沉运动的半浸入式防波堤。波能反射-透射-耗散分析表明，升沉运动模型的耗散方式与固定防波堤的耗散方式相反，固定防波堤以反射方式执行。可以推论，最大压力施加在结构的海底淹没边缘上，而由于波浪能量的耗散，作用在结构的海面垂直面上的压力比作用在下游垂直面上的相应压力高得多。还揭示出，底部的波浪引起的液压取决于波浪的高度和波长。详细的提升压力测量结果揭示了针对两种检查构型，作用在防波堤水下龙骨上的提升压力分布。由于上扬压力分布的复杂形状，应注意，至少应将其数字化四点，以便最终在整合后产生作用在防波堤上的上扬力。液压压力根据波高线性增加。关于波长的影响，作用在固定防波堤上的水压在B / L = d / L的最大值为0.08左右，对于B / L = d / L的较高值几乎呈线性下降。在波动运动防波堤的情况下观察到相反的现象，涉及到波长的影响。对于较高的B / L = d / L（较低的L值），压力几乎呈线性增加。据推论，作用在固定结构上的垂直力平均比作用在升沉运动防波堤上的垂直力平均高11％。对于固定和升沉运动模型，在规则波的情况下，在防波堤的海面上观察到准驻波。对于固定和升沉运动模型，在不规则波浪的情况下，在防波堤的海面上观察到轻微的破碎波。结构前部的波谱分析表明，只有在不规则波的情况下才确认存在高次谐波，从而确认结构前部存在轻微的破坏波。这就是为什么不规则波会在较高压力和力的作用下在结构上产生轻微的破裂冲击波的原因。

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