Wind Shear Stress Acting on Water Surface

• Published in: Journal of the Visualization Society of Japan Vol. 27; no. Supplement2; pp. 9 - 10
• Main Authors: KIM, Byungill, MIZUTANI, Natsuki
• Format: Journal Article
• Language: Japanese
• Published: The Visualization Society of Japan 2007
• Subjects: momentum flux; Reynolds stress; viscous stress; wind shear stress
• ISSN: 0916-4731; 1884-037X; 1884-037X
• DOI: 10.3154/jvs.27.Supplement2_9

This study investigated about the continuity of momentum flux through an air-water interface. We conducted to measure air-flow and water-flow very close to a water surface in a wind wave tank using PIV technique. To evaluate of the continuity of momentum flux calculating from the friction velocity was very difficult, because we could not detect exact a mean water level to fit a log-law profile for the experimental data. The viscous stress affected not only the viscous sub layer but also the turbulent boundary layer. The ratio of the viscous stress in water-flow is from several percent to about ten percent. We deduced that the continuity of momentum flux calculating from the total stress was strongly affected by three-dimensional turbulent water-flow.