Seabed roughness in tidal flows - A review of existing measurements (SR 360)

This report describes a review of field measurements concerning the variation of the seabed roughness length throughout a tidal cycle, as part of a two year research study funded by MAFF to investigate sediment transport under real sea conditions.
Specifying the bed roughness is a major source of uncertainty in the computation of coastal flows and sediment transport, especially since there is some evidence that the roughness varies with time. This question prompted the present review.