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Effects of intertidal wetland vegetation and suspended sediment on flow velocity profiles and turbulence characteristics

机译：潮间带湿地植被和悬浮泥沙对流速剖面和湍流特征的影响

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摘要

Intertidal wetland vegetation has an important role in flow structure, suspended sediment movement and geomorphology evolution. This study performed a flume experiment using Scirpus mariqueter from the field to investigate the impact of wetland vegetation on flow structure. The experimental plans were designed based on the relative depth of flow depth to vegetation height, i.e., non-submerged, moderately submerged and completely submerged conditions. Based on the measured Reynolds stress distribution, the classical mixing length hypothesis was used to derive the new velocity profiles inside the canopy. The good agreement of the results demonstrated that this method can be used to predict the velocity distribution of the submerged flow with flexible vegetation. Through statistical analysis combined with the theory of the boundary layer and sediment movement dynamics, the turbulence intensity and fine sediment distributions within the canopy were also obtained. The results reveal the mechanism of the effect of vegetation on the water and sediment of tidal flat in theoretical terms and enhance the understanding of hydrodynamics within the canopy.
机译：潮间带湿地植被在水流结构，悬浮泥沙运动和地貌演化中具有重要作用。这项研究使用野外Scirpus mariqueter进行了水槽实验，以研究湿地植被对水流结构的影响。实验计划是根据水深与植被高度的相对深度来设计的，即非淹没，中等淹没和完全淹没的条件。基于测得的雷诺应力分布，经典的混合长度假设被用来推导出冠层内部的新速度分布。结果的良好一致性表明，该方法可用于预测具有柔性植被的淹没流的速度分布。通过统计分析，结合边界层理论和泥沙运动动力学，获得了冠层内部的湍流强度和细沙分布。结果从理论上揭示了植被对滩涂水和沉积物的影响机理，并增强了对冠层内部水动力的理解。

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  • 来源
    《Estuarine Coastal and Shelf Science》 |2014年第5期|128-138|共11页
  • 作者

    Xianye Wang; Dailiang Yuan; Qing He; Xiekang Wang;

  • 作者单位

    State Key Laboratory of Estuarine and Coastal Research, East China Normal University, Shanghai 200062, PR China;

    State Key Laboratory of Estuarine and Coastal Research, East China Normal University, Shanghai 200062, PR China;

    State Key Laboratory of Estuarine and Coastal Research, East China Normal University, Shanghai 200062, PR China;

    State Key Laboratory of Hydraulics and Mountain River Engineering, Sichuan University, Chengdu 610065, PR China;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    vegetation; flow structure; turbulence; fine sediment; Acoustic Doppler Velocimeter;

    机译：植被;流结构湍流细沙声学多普勒测速仪;

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