Abstract
The concentration distribution of suspended sediment under non-equilibrium conditions due to the change of bed shear stress was investigated by focussing the analogy between the transient process of the Reynolds-stress distribution and that of the turbulent flux of suspended sediment. The impulse response of the Reynolds-stress distribution was empirically determined by a classic wind-tunnel data, and its applicability to that of an open channel flow was certificated by the recent accurate data of turbulence measurements in the flow with abrupt change of bottom roughness. By applying this impulse response, the suspended sediment-flux distribution due to turbulence in the transient process was described. Moreover, by using the boundary condition at the water surface, the suspended sediment concentration distribution under non-equilibrium conditions was deduced. The proposed method to estimate the non-equilibrium suspended sediment concentration revealed that the so-called adaptation length of suspended load reaches a few hundred times flow depth.
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