Publication Detail

Bottom Roughness for Wave and Current Boundary Layer Flows over a Rippled Bed

Paul P. Mathisen, Ole Madsen
273 pp.
MITSG 93-27

Experimental data characterizing bottom roughnesses for wave and current boundary layers are presented. Wave-current interaction over a rippled bed was observed in a 30-m-long flume modified to accommodate a uniform current; roughness determinations are compared for pure wave motion, pure current flow, and combined wave-current flow. Experiments were also carried out using spectral waves over a rippled bed. Using a representative friction factor in conjunction with an equivalent monochromatic wave produced a roughness estimate in good agreement with the roughness for strictly monochromatic waves. Thus researchers were able to verify the concept of an equivalent monochromatic wave for use in characterizing energy dissipation and determining friction factors.

type: Technical reports

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Parent Project

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

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