Based on the Shields diagram and laboratory observations, novel equations for the inception of sediment transport in a nearly straight, almost horizontal rectangular channel are developed. Separate equations for the viscous, the transition and the turbulent rough regimes are provided, that depend exclusively on basic hydraulic parameters such as cross-sectional velocity, that are readily available for the hydraulic engineer. In addition sediment mixtures with an intermediate degree of sediment sizes are considered, and Shields formulation is expanded to account for a mixture densimetric particle Froude number. The results of the present project are readily applicable for design, therefore.
|Titolo:||Simplified Shields condition for sediment transport inception|
|Autori interni:||OLIVETO, Giuseppe|
|Data di pubblicazione:||2001|
|Appare nelle tipologie:||4.1 Contributo in atti di Convegno|