HR: 0800h
AN: OS21B-1222    [Abstracts]
TI: Scour and Burial of Submerged Mines in Wave Conditions
AU: * Hatton, K A
EM: hatton.23@osu.edu
AF: Ohio State University, Department of Civil and Environmental Engineering and Geodetic Science, 470 Hitchcock Hall, 2070 Neil Ave, Columbus, OH 43210 United States
AU: Foster, D L
EM: Foster.316@osu.edu
AF: Ohio State University, Department of Civil and Environmental Engineering and Geodetic Science, 470 Hitchcock Hall, 2070 Neil Ave, Columbus, OH 43210 United States
AU: Traykovski, P
EM: ptraykovski@whoi.edu
AF: Woods Hole Oceanographic Institute, Applied Ocean Physics and Engineering Department, Mailstop 11, Woods Hole, MA 02543 United States
AU: Smith, H D
EM: smith.2975@osu.edu
AF: Ohio State University, Department of Civil and Environmental Engineering and Geodetic Science, 470 Hitchcock Hall, 2070 Neil Ave, Columbus, OH 43210 United States
AB: Resolving the hydrodynamics and sediment response leading to the scour and burial of three-dimensional submarine objects remains an area of interest for engineers, oceanographers, and military personnel. Improving methods for detection of buried and submerged mines is of great importance due to the limitations of the present detection methods. A computational fluid dynamics model, FLOW-3D is used for the three-dimensional simulation of flow around individual cylindrical mines. FLOW-3D is a three-dimensional non-hydrostatic finite difference model that closes the continuity and Navier-Stokes equations with a k-$\epsilon$ closure scheme. In this presentation, numerical simulations are performed for a single storm event observed during the Martha's Vineyard Coastal Observatory (MVCO) Mine Burial Experiment in 2003. Significant wave heights of 3 m with peak periods of 4-8 s resulted in significant amounts of mine scour and burial during the event. The model is forced with 4 different conditions representing the free stream flow prior to, during, and following the storm event. In each case, simulations are performed for two grain sizes with bottom boundary conditions specified with 1$)$ a fixed flat bed with no initial mine burial or scour and 2$)$ the observed bed profile. Patterns of scour and deposition are inferred from calculations of the bed shear velocity and Rouse parameter, respectively. Model results are compared with two-axis sonar images obtained during the MVCO Mine Burial Experiment. Consistent with the observations, model simulations indicate mine scour initiates at the ends of the mine. Model simulations also show that subsequent mine burial and scour is highly sensitive to the initial assumption of the bed profile. These results may allow us to improve our understanding and predictive capability for mine burial and scour.
DE: 4500 OCEANOGRAPHY: PHYSICAL
DE: 4558 Sediment transport
DE: 4568 Turbulence, diffusion, and mixing processes
SC: Ocean Sciences [OS]
MN: 2004 AGU Fall Meeting