Experimental Study on Scouring of a Sand Bar by Overflow

Abstract

Velocities and bottom shear stresses are measured, by an LDV, in flows over fixed-bed models, which correspond to instantaneous shapes of a sand bar during scouring. Two bed load tran sport formulas in non-equilibrium state are obtained in terms of the measured shear velocity with corrections of the effect of slope; one for erosion and the other for deposit. An empirical coefficient K_B in the equation of motion for sand is determined to be 0.02cm^-1.