Multi-Fraction Net Sediment Transports by Irregular Waves and a Current

In the coastal zone, rather large variations of the sediment composition can be observed, as a result of spatial differences in hydrodynamic conditions. In order to be able to calculate the selective sediment transport, the full grain size distribution of the sediment has to be taken into account. Measurements have been carried out in a wave flume with a well-graded, rippled sediment bed to determine the net sediment transport per fraction. The data show that the finer sediment fractions are more easily transported, resulting in a coarsening of the remaining bed.