船行波作用下开孔生态护岸消浪特性研究

    Numerical study on wave dissipation characteristics of perforated ecological revetments under ship-generated waves

    • 摘要: 直立式开孔护岸在内河航道生态化改造中具有广阔的应用前景。然而,由于内河船行波具有突发性强、波陡大以及能量集中的独特特征,现有基于常规海浪的消波研究成果难以直接适用于内河航道的防护设计。为探明船行波作用下不同开孔型式生态护岸的消浪机制,本文构建了三维数值波浪水槽。在通过网格收敛性、理论解及物理模型试验证实其可靠性的基础上,对比了平板格栅型和平直孔洞型护岸在不同开孔尺寸、入射波高和水深条件下的动力响应与消浪性能。研究结果表明:在结构选型上,平直孔洞型护岸在降低后方透射波高和流速方面的效果整体优于平板格栅型护岸;在尺寸效应上,护岸的消浪性能与其开孔尺寸密切相关,减小孔径或格栅净距可显著增强结构的消波作用;在波浪响应上,随着入射波高的增大,护岸对波浪的反射作用随之增强,且平直孔洞型护岸在应对大波高工况时表现出更优的消波优势;在水深影响上,水深变化会显著改变波浪与孔洞结构的相互作用机制,在低水位工况下平直孔洞型护岸后方波高达到最小。本研究可为内河航道生态护岸的结构选型与优化设计提供理论参考。

       

      Abstract: Vertical perforated revetments have broad application prospects in the ecological transformation of inland waterways. However, ship-generated waves in inland waterways possess unique characteristics such as strong suddenness, large wave steepness and concentrated energy, making existing wave dissipation research based on conventional sea waves difficult to apply directly. To investigate the wave dissipation mechanism of ecological revetments with different perforation types under the action of ship-generated waves, a three-dimensional numerical wave tank is constructed in this study. After verifying the reliability of the numerical model through grid convergence, theoretical solutions, and physical model tests, the dynamic response and wave dissipation performance of the flat-grid and straight-hole revetments under different perforation sizes, incident wave heights, and water depths are systematically compared. The research results show that in terms of structural selection, the straight-hole revetment generally outperforms the flat-grating type in reducing the transmitted wave height and flow velocity behind the structure. Regarding the size effect, the wave dissipation performance is closely related to the perforation size, and reducing the hole diameter or grating clearance can significantly enhance the wave dissipation effect. For wave response, an increase in incident wave height enhances the reflection effect of the revetment, and the straight-hole revetment exhibits superior wave dissipation advantages under large wave height conditions. Regarding water depth, its variation significantly alters the interaction mechanism between waves and perforated structures, with the wave height behind the straight-hole revetment reaching its minimum under low water level conditions. This study can provide theoretical references for the structural selection and optimization design of ecological revetments in inland waterways.

       

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