Abstract
Equivalent roughness and flow resistance of erodible beds in open channel flow in the presence of sand waves are theoretically investigated. Based on boundary layer theory, the geometrical properties of sand waves are introduced as dominant factors affecting on flow resistance. Using linear stability analysis, dominant length of sand waves is obtained. Applying one dimensional wave equation and continuity equation for sediments, the height and steepness of sand waves are obtained. Suspended sediment effect is taken within the scope of study. The results of the presented model are significantly better than previous studies.
