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Turbulence and Shear Flow Phenomena -1 First International Symposium

ISBN:
1-56700-135-1 (Print)

Experimental Measurement of the Boundary Layer Velocity Field Induced by Water Waves Propagating Over a Ripple Bed

Phillip L.-F. Liu
School of Civil & Environmental Engineering Hollister Hall, Cornell University Ithaca NY 14853-3501

Edwin A. Cowen
School of Civil & Environmental Engineering Hollister Hall, Cornell University Ithaca NY 14853-3501

Khaled A. Al-Banaa
School of Civil & Environmental Engineering Hollister Hall, Cornell University Ithaca NY 14853-3501

Abstract

The surface-wave induced boundary-layer flow field over a fixed ripple bed was studied using particle tracking velocimetry. The surface wave phase-dependent mean velocity and vorticity fields are presented for one-half wave period (the system is essentially, although not exactly symmetric) showing the vorticity generation and ejection process. The wave-induced streaming (mass flux) profile is determined and its implications discussed. The Reynolds stress, turbulence production, and turbulent kinetic energy at a single phase are presented and discussed.