Experiments in a 3D flow basin on near-orthogonal wave-current flows over smooth and uniform fixed roughness beds.
Drastic transformation of wave-induced mass transport profiles after the addition of turbulent currents.
Roughness estimation with smooth turbulent equation if the laminar wave boundary layer is within current viscous sublayer.
Grant-Madsen model over-accounts the influence of waves on near-orthogonal currents; correction scheme has been proposed.
Near-bottom flow veers from the mainstream direction, which can be attributed to turbulence asymmetry and parasitic waves.
Contamination of log-profile analysis by wave-induced mass transport flow is observed for 60° and 120° wave-current flows.