Sediment Transport of Fine Sands at High Velocities

摘要

The predictive capability of the sediment-transport formulas of Ackers-White,Engelund-Hansen, and van Rijn at high flow velocities is investigated. Total-load transport at high velocities over a fine-sand bed (100-400 micro m) is studied by analyzing data from the literature and data from new flume and field measurements. Flume experiments were performed to measure flow-velocity and sand-concentration profiles in a self-eroding flow initially free of sediment. A two-dimensional vertical mathematical model for suspended sediment was applied to compute the equilibrium transport rates. Finally, predicted transport rates are compared with measured transport rates under flume and field conditions.