HR: 0800h
AN: OS21B-1232    [Abstracts]
TI: Spatial and Temporal Variability of Wave Ripple Wavelengths in the Inner Shelf
AU: * Nelson, T
EM: tnelson@geol.sc.edu
AF: Deparment of Geological Sciences, University of South Carolina, Columbia, SC 29208 United States
AU: Voulgaris, G
EM: gvoulgaris@geol.sc.edu
AF: Marine Science Program, University of South Carolina, Columbia, SC 29208 United States
AU: Hanes, D M
EM: dhanes@usgs.gov
AF: U.S. Geological Survey, Pacific Science Center, Santa Cruz, CA 95064 United States
AU: Warner, J C
EM: jcwarner@usgs.gov
AF: U.S. Geological Survey, Woods Hole Science Center, Woods Hole, MA 02543 United States
AB: As part of the South Carolina Coastal Erosion Study (SCCES) two boundary layer tripods were deployed at two locations on other side of a large shoal. The objective was to collect in-situ roughness and sediment transport data to be used in subsequent numerical modeling efforts. Each tripod was equipped with acoustic backscatter sensors (ABS) for measuring profiles in suspended sediment concentration, acoustic Doppler velocimeters (ADV) for measuring oscillatory and steady flow conditions near the bed. Bedform characteristics (wavelength and orientation) were captured during the experiment using high resolution rotating sonars. In this contribution, we discuss the bottom boundary layer conditions for which data were collected (spanning a total period of 6 months) and we focus on the temporal evolution of the ripple wavelength and orientation in response to the wave and current conditions for a period of one month. The response time between hydrodynamic forcing and bed adjustment will be discussed as well as the capability of existing wave ripple characteristics models to predict the observed ripple wavelengths and their temporal evolution.
DE: 2487 Wave propagation (6934)
DE: 2494 Instruments and techniques
DE: 2499 General or miscellaneous
DE: 3307 Boundary layer processes
SC: Ocean Sciences [OS]
MN: 2004 AGU Fall Meeting