Effect of Bedload Sediment Natural Composition on Geometric and Dinamic Characteristics of Channel Forms

Abstract

The article brings up data on sediment diversity at watercourse bed and on their movement in the form of ridges. The ridge form movement of sediment leads to the reduction of reservoir volume and canal cross section area, which has an effect on their carrying capacity, filling of pump station forechambers and hydroelectric station pressure basins with sediment. The presence of sediment in flow leads to abrasive deterioration of pumps, water motors and pressure pipes and to other negative consequences. Research work tasks on the study of these effects have been examined with the purpose of preventing such negative consequences. On the basis of laboratory data diagrams and relationships were obtained for ridge length, height and movement velocity vs. sediment hydraulic and geometric sizes.

Prediction of Bedform Dimensions on Alluvial Bed in Unidirectional Flow

“…In a uniform and constant unidirectional flow, one or more types of bedforms are concentrated in certain flow conditions after the bed forms, and the flow condition reaches equilibrium [21]. The description for bed sediment is usually expressed in terms of the sediment mixture gradation and specific weight [22]. Dense two-dimensional sand-wave groups are formed in low-lying areas with abundant sediment.…”