Part-Full Flow in Pipes with a Sediment Bed. Part One: Bedform Dimensions. Part Two: Flow Resistance

摘要

Experiments were made in a part-full pipe with a movable sediment bed to measure bedform dimensions and flow resistance. The measurements were located in the transitional region from ripples to dunes. Measured bedforms and flow resistance were compared with the calculated values given by methods for the prediction of bedform dimensions and flow resistance in rivers and alluvial channels. In the absence of a method that directly applies to the present case, the method of Fredsoe for bedform dimension prediction and the method of Engelund and Hansen for flow resistance, both with a sound hydrodynamic basis, can be used in part-full flow in pipes with a sediment bed with fairly good results. Further experiments are needed before one can definitely judge which method most accurately describes bedforms in sewers.