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首页> 外文期刊>Earth Surface Processes and Landforms: The journal of the British Geomorphological Research Group >A rational sediment transport scaling relation based on dimensionless stream power
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A rational sediment transport scaling relation based on dimensionless stream power

机译：基于无量纲流功率的合理沉积物传输缩放关系

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摘要

The concept of stream channel grade - according to which a stream channel reach will adjust its gradient, S, in order to transport the imposed sediment load having magnitude Qb and characteristic grain size Db, with the available discharge Q (Mackin, 1948, Geological Society of America Bulletin 59: 463-512; Lane, 1955, American Society of Civil Engineers, Proceedings 81: 1-17) is one of the most influential ideas in fluvial geomorphology. Herein, we derive a scaling relation that describes how externally imposed changes in either Qb or Q can be accommodated by changes in the channel configuration, described by the energy gradient, mean flow depth, characteristic grain size and a parameter describing the effect of bed surface structures on grain entrainment. One version of this scaling relation is based on the dimensionless bed material transport parameter (W*) presented by Parker and Klingeman (1982, Water Resources Research 18: 1409-1423). An equivalent version is based on a new dimensionless transport parameter (E*) using dimensionless unit stream power. This version is nearly identical to the relation based on W*, except that it is independent of flow resistance. Both versions of the scaling relation are directly comparable to Lane's original relation. In order to generate this stream power-based scaling relation, we derived an empirical transport function relation relating E* to dimensionless stream power using data from a wide range of stable, bed load-dominated channels: the form of that transport function is based on the understanding that, while grain entrainment is related to the forces acting on the bed (described by dimensionless shear stress), sediment transport rate is related to the transfer of momentum from the fluid to the bed material (described by dimensionless stream power).
机译：流频道等级的概念 - 根据该流频道达到的概念将调节其梯度，S，以便将具有幅度QB的施加沉积物载荷和特征粒度DB的施加载荷进行调节，具有可用的放电Q（Mackin，1948，地质学会美国公告59：463-512; 1955年，美国土木工程师协会，1911：1-17）是河流地貌中最有影响力的思想之一。在此，我们得出了一种缩放关系，所述缩放关系描述QB或Q中的外部施加变化如何通过能量梯度，平均流量深度，特征粒度和描述床面效果的参数来容纳了QB或Q的外部施加变化。谷物夹带的结构。这种缩放关系的一个版本基于帕克和克林曼（1982年，水资源研究18：1409-1423）提供的无量纲床材料运输参数（W *）。等效版本基于使用无量纲单元流功率的新无量纲传输参数（E *）。此版本几乎与基于W *的关系相同，除了它与流动阻力无关。缩放关系的两个版本与Lane的原始关系直接相当。为了产生基于流功率的缩放关系，我们使用来自各种稳定的床加载主管通道的数据导出与维度无量纲流电源相关的经验传输函数关系：该传输功能的形式基于理解，虽然谷物夹带与作用在床上的力（由无量纲剪切应力描述）有关，但是沉积物传输速率与从流体到床材料的动量转移（由无量纲流功率描述）。

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