推移质
地质学
高含沙水流
泥沙输移
湍流
机械
无量纲量
明渠流量
剪应力
岩土工程
地貌学
沉积物
物理
作者
Peng Gao,Athol D. Abrahams
摘要
Abstract During bedload movement by saltation, streamwise momentum is transferred from the flow to the saltating grains. When the grains collide with other grains on the bed or in the flow, streamwise momentum is reduced, and there is a decrease in streamwise flow velocity and an increase in flow resistance, herein termed bedload transport resistance f bt . Based on experiments in two flumes with fixed and mobile plane beds and previously published data, an equation is developed that may be used to predict f bt for both capacity and non‐capacity flows. The variables in this equation are identified by dimensional analysis and the coefficients are determined by non‐linear regression. This equation applies to rough turbulent open‐channel flows, where the relative submergence is between 1 and 20 and the entire sediment load moves by saltation. An investigation of the relative magnitudes of f bt and grain resistance f c suggests that where dimensionless shear stress θ is less than 1 and saltation is the dominant mode of bedload transport, f bt /f c increases with θ but never exceeds 1. Copyright © 2004 John Wiley & Sons, Ltd.
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