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Laboratory investigation on hydraulic performance of enlarged pile head breakwater

机译：扩大桩头防波堤水力性能的实验室调查

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摘要

Coastal erosion of beaches has been a common problem around the world. One of the eco-friendly control measures for coastal erosion is to dissipate the energy of waves impinging on the shores by constructing offshore breakwater. Pile breakwater is one such type of offshore breakwater that consists of a number of closely spaced piles. Construction of piles at closer spacing is highly challenging and expensive. This problem can be addressed by reducing the number of piles and modifying the pile with an enlarged head in the vicinity of the water surface, where wave energy is concentrated. In the present study, an experimental investigation on the hydraulic performance of enlarged pile head breakwater is conducted in a wave flume. The concept breakwater is subjected to monochromatic waves of varying wave heights, wave periods and water depth. The experimental results show that the least value of transmission coefficient is 0.62 and reflection coefficient is 0.123 with the highest value of dissipation coefficient of 0.77 for the structural configuration of b/D ratio of 0.2, D/H(m)(ax)( )of 0.6 and Y/H-max of 1.0 at a water depth of 0.3 m. Observed results are encouraging and are in line with the similar type of pile breakwaters in a single row. The present experimental data is also validated with the available theoretical solutions. Since the results from the compared theoretical solution are not in good agreement, a hybrid theoretical model is reconstructed based on experimental results of pile head breakwater. The proposed modified version of the hybrid equation predicts encouragingly better transmission, reflection and dissipation coefficient than the existing solutions. Moreover, the results predicted by the proposed hybrid equation are in good agreement with that of other similar pile breakwater models.
机译：海滩海滩侵蚀是世界各地的常见问题。沿海侵蚀的环保控制措施之一是通过构建海上防波堤来消散冲击海岸的波浪的能量。桩防波堤是一种这种类型的海上防堤，包括许多紧密间隔的桩。在更近距离间距的桩的施工具有高度挑战性和昂贵。通过减少桩的数量并在水面附近修改桩的桩的数量来解决这个问题，其中波能量集中。在本研究中，在波的水槽中进行了对扩大桩头防堤水力性能的实验研究。概念防波堤受到不同波浪高度，波浪时段和水深的单色波。实验结果表明，透射系数的最低值为0.62，反射系数为0.123，耗散系数的最高值为0.77，用于B / D比为0.2，D / H（M）（AX）（）在水深0.3米的水深0.6和y / h-max为1.0。观察结果是令人鼓舞的，并符合单一行中类似类型的桩间洞。目前的实验数据也用可用的理论解决方案验证。由于来自化学的理论解决方案的结果并不符合良好的一致性，基于桩头防波堤的实验结果重建了混合理论模型。 Hybrid方程的所提出的修改版本预测比现有解决方案更好地更好地传输，反射和耗散系数。此外，所提出的混合式方程预测的结果与其他类似桩防水模型的吻合吻合良好。

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