HR: 0800h
AN: OS11A-0486    [Abstracts]
TI: Inclusion of Wave Direction in Bathymetry Inversion Algorithms
AU: * Splinter, K D
EM: ksplinte@coas.oregonstate.edu
AF: Oregon State University, 104 Ocean Admin Building, Corvallis, OR 97331-5503 United States
AU: Holman, R
EM: holman@coas.oregonstate.edu
AF: Oregon State University, 104 Ocean Admin Building, Corvallis, OR 97331-5503 United States
AB: With the increasing focus on understanding, and managing the response of natural coastlines to rising sea level, there is an ongoing need for accurate measurements of nearshore bathymetry. Traditional in-situ surveys, while accurate, are logistically hard, and time-consuming. An attractive alternate method that has seen increasing application is the use of video images to calculate bathymetry based on wave celerity. However, most accepted algorithms only exploit the magnitude of the wave number, k, and ignore refractive turning of waves as an exploitable signal. We propose a method that uses snap shots of shoaling waves to determine the directional components of the wave number (kx, ky), and the resulting bathymetry. Wave phase is determined using Hilbert transforms of the 2D image. From the spatial gradients of the wave phase, we calculate kx, ky, wave angle, and the resulting bathymetry. The method is initially tested using a simple model to generate a wave field on a known bathymetry, and then using the above techniques to regenerate the input. The model is also tested with field data.
DE: 3094 Instruments and techniques
DE: 3099 General or miscellaneous
SC: Ocean Sciences [OS]
MN: 2004 AGU Fall Meeting