American Society of Civil Engineers

Exchange of Horizontal Momentum in Combined Waves and Current

by Rolf Deigaard, (Dept. of Hydrodynamics and Water Resources (ISVA), Technical University of Denmark, Building 115, DK 2800 Lyngby, Denmark)
Section: Part I Characteristics of Coastal Waves and Currents, pp. 320-333, (doi:

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Document type: Conference Proceeding Paper
Part of: Coastal Engineering 2000
Abstract: The horizontal momentum exchange due to the organised motion in combined waves and current is analysed in an Eulerian framework. The interaction between the waves and a vertically sheared current causes small time-varying velocities due to the time-varying deformation of the current velocity profile by the wave motion. These velocities are — in combination with the wave orbital velocities — of importance for the momentum exchange, and they are included in the analysis. Their significance is illustrated by examples, considering a situation with a steady uniform longshore current.

ASCE Subject Headings:
Wave propagation
Littoral currents
Velocity profile
Velocity distribution