WAVE-CURRENT INTERACTION WITHIN AND OUTSIDE THE BOTTOM BOUNDARY-LAYER

This paper reviews the state-of-the-art as perceived by the Wave-Curre nt Interaction (WCI) group which forms part of the MAST G6M Coastal Mo rphodynamics project, and includes some new results arising out of tha t project. Those processes which affect the vertical profiles of curre nt and wave kinematics, and the bed shear-stresses, are discussed, but ''horizontal'' processes such as refraction of waves by currents, and generation of longshore currents, are not included. Among the group's conclusions are recommendations for the calculation of wave-induced b ottom orbital velocities with and without WCI, and direct parameterisa tions of the bed shear-stresses produced by WCI. The latter is the res ult of a comprehensive intercomparison of WCI boundary-layer models an d data. The results are aimed at aiding the formulation of numerical m odels of coastal morphodynamics.