During the last years, experimental research in the Large Oscillating Water Tunnel (L. O. W. T.) and the Vinje basin (both of Delft Hydraulics) is aimed at the understanding and mathematical description of the process of near-bed sediment transport induced by non-breaking waves. The understanding of the near-bed sediment dynamics is important for the description of bed-load transport and suspended sediment transport. Especially the present knowledge of the physical process of the wave related transport component is restricted. This study focuses on the understanding of time-averaged concentration profiles under different wave, current and sediment characteristics. When the time-averaged sediment mixing coefficient profile is known, the calculation of the sediment transport on a wave-averaged scale is easier. To get a better understanding of the time-averaged concentration profile the underlying sediment mixing coefficient will be studied. The sediment mixing coefficient gives insight in the sediment concentration profile.The time-averaged concentration profiles were obtained from experiments which were executed in the L.O.W.T. and the Vinje basin. These concentration profiles were transformed into sediment mixing coefficient profiles. The effects, which the different wave, current and sediment characteristics had on the sediment mixing distribution were analysed next. The main results and conclusions can be summarized as follows: 1. Almost all the general shapes of the sediment mixing coefficient distributions are the same as in Fig. 1 with: - an inner layer; - an overlap layer; - an outer layer. 2. Sheetflow diminishes mixing outside the sheetflow layer. Vortices dominated conditions on the other hand, enhance mixing.