OS11A-1263:
NUMERICAL AND LABORATORY INVESTIGATION OF TURBULENCE DISSIPATION IN THE SWASH ZONE
Monday, 15 December 2014
Jose Carlos Pintado-Patino, Universidad Nacional Autónoma de México, Institute of Engineering, Sisal, Mexico, Alec Torres-Freyermuth, UNAM National Autonomous University of Mexico, Mexico City, Mexico and Jack Anthony Puleo, Univ of DE-Civil & Envir Engrg, Newark, DE, United States
Abstract:
An integrated study of turbulence dissipation in the swash zone was conducted in the Large Wave Flume (Großer Wellenkanall, GWK) in Hannover in July 2013. The experiments were focused on the collection of high spatial/temporal resolution data inside the swash zone, consisting of simultaneous measurements of free surface and wave run up from 45 across-shore ultrasonic distance meters (UDM), near bed velocity profiles from 2 Vectrino II acoustic Doppler profiling velocimeters, and direct bed shear stresses from 3 shear plates. This data set is employed to validate a 2D Reynolds-Averaged Navier-Stokes model with VOF-tracking scheme and a k-ε turbulence closure. The numerical model is compared with measurements under different forcing conditions (H=0.6 m to 1.0 m and T=8 s to 14 s) over both rough and smooth steep (1/6) beach slopes. The depth and phase resolving model simulations are used to further investigate the cross-shore variability of turbulence dissipation and shear stress at the tip of the swash lens. Furthermore, this work will explore the dependency of the turbulence dissipation on the forcing and bed roughness conditions. Funded by NSF.
