The transport of sediment in regions with vegetation plays an important role in aquatic ecosystems and landform evolution in river deltas. In this study, flow parameters and suspended sediment concentration (SSC) within an emergent canopy with real plant morphology (Typha latifolia) were measured in a laboratory channel. T. latifolia is a common marsh species with multiple thin leaves emerging from a tight bundle (culm) at the bed. The observed equilibrium SSC profile differed significantly from a Rouse profile, the classic model for SSC over bare beds. The vertical distribution of SSC was nearly uniform in the culm region of the canopy, and decreased with height in the upper canopy region of distributed leaves. The profile of SSC reflected the vertically nonuniform turbulent diffusion, which arose from the plant morphology. A diffusivity model based on cylinder arrays was first validated with tracer data and then adapted to the T. latifolia morphology, providing a way to model turbulent diffusivity in marsh systems. The diffusivity model was successfully used within a random displacement model to predict the spatial evolution and equilibrium SSC profile within the T. latifolia canopy.

中文翻译：

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香蒲树冠中的悬浮沉积物浓度分布

有植被区的泥沙输运对河流三角洲的水生生态系统和地貌演化具有重要作用。在这项研究中，在实验室通道中测量了具有真实植物形态（Typha latifolia）的紧急冠层内的流动参数和悬浮泥沙浓度（SSC）。阔叶树是一种常见的沼泽物种，从床上的紧密束（秆）中长出多片薄叶。观察到的平衡 SSC 剖面与 Rouse 剖面显着不同，Rouse 剖面是裸床上 SSC 的经典模型。SSC的垂直分布在冠层的秆区几乎均匀，在分布的叶片上部冠层区域随高度降低。SSC 的剖面反映了垂直不均匀的湍流扩散，这是由植物形态引起的。基于圆柱阵列的扩散率模型首先用示踪剂数据进行验证，然后适用于T. latifolia形态学，提供了一种模拟沼泽系统中湍流扩散的方法。扩散率模型成功地用于随机位移模型中，以预测阔叶树冠层内的空间演化和平衡 SSC 剖面。