HR: 0800h
AN: OS11A-0482    [Abstracts]
TI: Continuing Studies of Turbulent Bore Wave Evolution
AU: * Piccirillo, P B
EM: paul.piccirillo@sri.com
AF: SRI International, 333 Ravenswood Ave., Menlo Park, CA 94025 United States
AU: Tremain, D
EM: dennis.tremain@sri.com
AF: SRI International, 333 Ravenswood Ave., Menlo Park, CA 94025 United States
AU: Orwoll, M
EM: mark.orwoll@sri.com
AF: SRI International, 333 Ravenswood Ave., Menlo Park, CA 94025 United States
AU: Weiss, J
EM: jeffrey.weiss@sri.com
AF: SRI International, 333 Ravenswood Ave., Menlo Park, CA 94025 United States
AB: Turbulent bore waves formed after wave breaking on beaches have been studied in the field with natural incident waves and in laboratory wave tanks for monochromatic and realistic wave spectra. The present research extends our previous research on the subject of turbulent bore evolution. In our current research, turbulent bores are generated in the Max Hammond Wave Tank at SRI, on an $\alpha$ = 0.04 sloped linear beach using TMA incident spectra. Instrumentation employed for measurement of bore propagation includes 28 capacitive wave height gauges and Ku-band Doppler radar. In this paper, we continue our study of the evolution of individual turbulent bores in greater detail using our capacitive wave height gauge data, to determine the effects of breaker type, bottom depth, and other factors on both the height and propagation velocities of the bores. New scalings, and scalings derived previously, for non-dimensionalizing the height and propagation velocity are tested with our new data, using analysis tools with improved logic for determining wave breaker type and wave breaking status. Results are also presented for more detailed wave "extractions" which test the universality of the suggested scalings and probe the physics of bore creation and propagation. Finally, radar reflectivity measurements are presented for turbulent bores with the results compared against the capacitive wave height gauge measurements, in order to determine how the radar can be used to observe the changing physics of the littoral region. The ongoing goals of this research are to improve prediction of turbulent bore waves in realistic conditions and develop techniques for retrieving bathymetry and other surf-zone properties via remote sensing.
DE: 4275 Remote sensing and electromagnetic processes (0689)
DE: 4546 Nearshore processes
DE: 4560 Surface waves and tides (1255)
SC: Ocean Sciences [OS]
MN: 2004 AGU Fall Meeting