Interaction between the free surface and the bed material in flow over rock chutes under macroroughness conditions leads to a high air entrainment into the flow. The note reports on an experimental study about air diffusion features in the flow over a long rock chute. Air concentration profiles and water depths over a uniform bed material were measured. An empirical equation for the average air concentration in macroroughness condition for steep slopes is proposed. A new Darcy-Weisbach equivalent friction factor for long chutes as a function of the slope and the relative equivalent depth has also been found.
|Autori:||Pagliara S; Carnacina I; Roshni T|
|Titolo:||Self-Aeration and Friction over Rock Chutes in Uniform Flow Conditions|
|Anno del prodotto:||2010|
|Digital Object Identifier (DOI):||10.1061/(ASCE)HY.1943-7900.0000270|
|Appare nelle tipologie:||1.1 Articolo in rivista|