低透空率桩基防波堤消浪效果研究

Study on wave dissipation effect of low-permeability breakwater with pile foundations

为验证新型低透空率桩基防波堤的消浪效果,进行模型试验预测和现场波浪观测后评估。通过断面模型、整体模型、防波堤工后内外侧波浪观测数据对比,得到反映其消浪效果的内外比波高系数。结果表明,在水深大于10 m、H_(1/10)大于2.5 m、海域开阔度接近180°的条件下,该结构方案基本可实现内外比波高控制在0.3以内的要求。实际海况中,比波高与外部波陡和潮位的关系显著,潮位较低时,实测波陡较大,对应比波高较小。

To verify the wave dissipation effect of a new type of low-permeability breakwater with pile foundations,this paper carries out model prediction and evaluation after on-site wave observation.The relative wave height of the internal and the external areas,which can reflect the wave dissipation effect of the breakwater,is obtained by the sectional model test,the whole model test and the post-observation of wave data on both sides of the breakwater.The results show that in the conditions of water depth > 10 m,H_(1/10) > 2.5 m and nearly 180° open sea area,the structure is able to meet the requirement that the relative wave height is controlled within 0.3.In the actual sea conditions,the relative wave height has a significant relationship with the external wave steepness and the tide level.Generally,the wave steepness is larger and the relative wave height is smaller when the tide level is lower.