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首页> 外文期刊>Earth Surface Processes and Landforms: The journal of the British Geomorphological Research Group >Challenges to the representation of suspended sediment transfer using a depth-averaged flux
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Challenges to the representation of suspended sediment transfer using a depth-averaged flux

机译：使用深度平均通量表示悬浮泥沙转移的挑战

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The sediment saturation recovery process (i.e. the adaptation of suspended sediment concentration [SSC] to local forcing) is the main feature of the non-equilibrium suspended sediment transport (SST) frequently occurring in fluvial, estuarine and coastal waters. In order to quantitatively describe this phenomenon, a series solution is analytically derived, including the evolution of both vertical SSC profile and near-bed sediment flux (NBSF), and is verified by net erosion and net deposition experiments, respectively. The results suggest that the sediment saturation recovery process involves vertically varying fluxes that are not represented correctly by depth-averaging. Consequently, a vertical two-dimensional (2D) combined scheme is established and applied respectively in to a dredged trench and to a sand wave feature to demonstrate this argument. By analyzing the variations of the calculated depth-averaged SSC and NBSF we reveal that the equilibrium state presented by the sediment carrying capacity (SCC) form of the NBSF, which is usually applied in depth-integrated SST models, lags behind the actual dynamic bed equilibrium state. Moreover, the key factor , the so-called saturation recovery coefficient within this form, is not only a function of local Rouse number but also is influenced by the local SSC profile. Finally, a three-dimensional (3D) non-orthogonal curvilinear body-fitted SST model is developed and validated in the Yangtze estuary, China, combined with the in situ hourly hydrographic data from August 14-15, 2007 during spring tide in the wet season. Model results confirm that the vertically varying sediment saturation recovery process, the discrepancies between the actual and SCC form of NBSF and non-constant value of are significant in actual real geomorphic cases. The quantitative morphological change resulting from variations in environmental conditions may not be correctly represented by uncorrected depth-integrated SST models if they do not treat the effects of vertical motion on the sediment saturation recovery process. Copyright (c) 2016 John Wiley & Sons, Ltd.
机译：沉积物饱和度恢复过程（即悬浮泥沙浓度[SSC]适应局部强迫）是河流，河口和沿海水域经常发生的非平衡悬浮泥沙运输（SST）的主要特征。为了定量描述这种现象，分析了一系列解决方案，包括垂直SSC剖面和近床沉积物通量（NBSF）的演化，并分别通过净侵蚀和净沉积实验进行了验证。结果表明，沉积物饱和度恢复过程涉及垂直变化的通量，而深度平均不能正确表示通量。因此，建立了垂直二维（2D）组合方案并将其分别应用于疏to沟槽和沙波特征，以证明这一论点。通过分析计算的深度平均SSC和NBSF的变化，我们发现，通常用于深度综合SST模型中的NBSF的泥沙承载力（SCC）形式呈现的平衡状态落后于实际动态床平衡状态。此外，关键因素，即此形式内的所谓饱和恢复系数，不仅是局部Rouse数的函数，而且还受到局部SSC轮廓的影响。最后，结合中国2007年8月14日至15日湿润春季潮汐的实地每小时水文数据，在中国长江口建立了三维（3D）非正交曲线拟合SST模型，并对其进行了验证。季节。模型结果证实了在垂直方向上变化的沉积物饱和度恢复过程，NBSF的实际形式和SCC形式之间的差异以及NBSF的非恒定值在实际的真实地貌案例中都非常重要。如果未经校正的深度综合SST模型未处理垂直运动对沉积物饱和度恢复过程的影响，则可能无法正确地表示由环境条件变化引起的定量形态变化。版权所有（c）2016 John Wiley＆Sons，Ltd.

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