Publication Detail

Waves and Currents Over a Fixed Rippled Bed

Paul P. Mathisen, Ole Madsen
18 pp.
MITSG 96-18J
$1.50 (3.50 foreign) DOM

In the inner-shelf region the fluid motions associated with waves and currents typically extend to the bottom, where boundary layers develop due to viscous effects. The fluid motions in these bottom boundary layers, which are commonly turbulent, govern bottom bed form development and sediment transport. To model turbulence in wave and current boundary layer flows, researchers have implemented mixing length models, advanced turbulence models, and eddy viscosity models. These models all share one common feature: the bottom roughness is characterized by a single roughness length scale. However, no experimental data have been presented such that this basic assumption can be considered verified. This and a companion paper present results of an experimental study to verify this basic assumption. In this paper, wave roughnesses (i.e., bottom roughness experienced by pure waves and waves in the presence of a current) are compared with the roughness experienced by a pure current.

type: Technical reports

Parent Project

Project No.: 1991-RC-28
Title: Interaction of Waves and Currents Over a Movable Bed

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