Suspended Sediment Concentration Profile in a Typha Latifolia Canopy
Suspended Sediment Concentration Profile in a Typha Latifolia Canopy
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香蒲冠层中的悬浮沉积物浓度分布
DOI：
10.1029/2021wr029902
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发表时间：
2021
影响因子：
5.4
通讯作者：
Heidi Nepf
中科院分区：
文献类型：
--
作者：
Yuan Xu;Heidi Nepf
植被覆盖区的泥沙输移对河流三角洲的水生态系统和地貌演变起着重要作用。在实验室水槽中，对具有真实的植物形态的宽叶香蒲（Typha latifolia）挺水树冠内的水流参数和悬沙浓度进行了测定。latifoliais是一种常见的沼泽物种，具有多个薄叶，从床处的紧密束（秆）中出现。所观察到的平衡SSC的配置文件显着不同的劳斯配置文件，经典的模型，SSC裸床。SSC在冠层的垂直分布在秆部几乎是均匀的，在分布叶片的冠层上部随高度的增加而降低。悬浮物浓度廓线反映了植物形态引起的垂向不均匀湍流扩散。首先用示踪剂数据验证了基于圆柱阵列的扩散率模型，然后将其应用于T。latifoliamorphology，提供了一种方法来模拟沼泽系统中的湍流扩散。在随机位移模型中成功地使用扩散率模型来预测T内的空间演化和平衡SSC剖面。宽叶型
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. latifoliais 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 theT. latifoliamorphology, 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 theT. latifoliacanopy.