Title: SUSPENDED SEDIMENT CONCENTRATION AND SEDIMENT TRANSPORT RATE IN WAVE AND CURRENT CO-EXISTING SYSTEM
Abstract: Numerical analysis was carried out to obtain the near-bottom flow velocity and the suspended sediment concentration in the wave and current co-existing system. The near-bottom flow velocity was computed by the turbulent boundary layer theory. The shear stress was evaluated by using the time-independent eddy viscosity proposed by Grant-Madsen.Suspended sediment concentration was computed by the turbulent diffusion theory. The diffusion coefficient was evaluated by using the horizontal and vertical components of flow velocity. The results for near-bottom flow velocity were compared with the laboratory data obtained by Asano et al. For opposing current, as the depth-averaged current velocity exceeds to 1/10-1/5 of the maximum bottom velocity in wave field, the direction of sediment transport is reversed.