Bed Shear Stresses Past a Flat Plate under Clear Water Equilibrium Scour State

The three-dimensional flow field at a flat plate (side facing the approaching flow) under clear water equilibrium scour regime was experimentally measured using an acoustic Doppler Velocimeter (ADV) in a laboratory tilting flume. Reynolds stresses at different azimuthal planes are computed. The bed shear stresses are determined from the Reynolds stresses and velocity gradients at different azimuthal planes (0°, i.e., at the upstream axis of symmetry, 45° and 90°). The critical bed shear stresses on the sloping beds are also computed with the help of Shields' diagram. The findings of the present study were also compared with the results obtained by previous researchers.