Particle Image Velocimetry Measurements within a Laboratory-Generated Swash Zone
Publication: Journal of Engineering Mechanics
Volume 129, Issue 10
Abstract
A particle image velocimetry (PIV) technique is used to make vertically resolved two-dimensional measurements in swash zone flows, which are notoriously recalcitrant to quantitative measurement. The PIV implementation directs the light sheet into the measurement region from beneath the beach thus avoiding issues of free surface diffraction effects. Fluorescent particles and an optical filter are used to ensure that only particles, and not bubbles or free surface anomalies, are imaged. The spatially and temporally resolved velocity fields measured in a plunging and spilling wave-driven swash zone are used to investigate the boundary layer structure of the mean and turbulent quantities as well as the phase evolution of the bed shear stress, near-bed turbulent kinetic energy, and the dissipation. Results suggest that vertical structure in spilling and plunging wave forced swash zones are similar. The uprush phase is dominated by bore-generated and bore-advected turbulence, which evolves analogously to grid turbulence, while the downrush phase is ultimately dominated by boundary layer generated turbulence, which compares well near-bed with classic flat plate boundary layer theory.
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Information & Authors
Information
Published In
Journal of Engineering Mechanics
Volume 129 • Issue 10 • October 2003
Pages: 1119 - 1129
Copyright
Copyright © 2003 American Society of Civil Engineers.
History
Received: May 16, 2002
Accepted: Apr 25, 2003
Published online: Sep 15, 2003
Published in print: Oct 2003
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