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ASTER bathymetry in computational fluid dynamic simulation of Rongelap Atoll hydrodynamics, Marshall Islands
Conference paper   Peer reviewed

ASTER bathymetry in computational fluid dynamic simulation of Rongelap Atoll hydrodynamics, Marshall Islands

Eric L Peterson
Proceedings of the 11th International Coral Reef Symposium, Volume 1, pp.491-495
International Coral Reef Symposium, 11th (Fort Lauderdale, United States, 07-Jul-2008–11-Jul-2008)
ReefBase
2008
url
http://www.reefbase.org/resource_center/publication/icrs.aspxView
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Abstract

Environmental Engineering ICRS11 hydrodynamics of coral-reef systems atoll hydrodynamics remote sensing
ASTER green, red and near infra-red (NIR) imagery with a resolution on the order of handheld GPS echo soundings was calibrated to model bathymetry of Rongelap Atoll to a depth of 10 meters. The ASTER model was converted into of depth contours at 1, 2, 4, 8, and 16 meters. Beyond that depth nautical charts and echo soundings were used to model bathymetry. The combined result was a bathymetric digital elevation model of Rongelap Atoll and surrounding seas, which was converted to X,Y,Z file and for input into reverse engineering software. The reverse engineering software then created a NURBS (Non-Uniform Rational BSpline) surface model, for input into the finite element meshing program GAMBIT (ANSYS Fluid Dynamics International). These data were then ordered in volumetric and substrate surface elements of coral reefs and input to the FLUENT computational fluid dynamics (CFD) package. Bluelink (Australian Bureau of Meteorology and CSIRO) was used to apply boundary conditions, and results are hydrodynamic charts of the atoll. The resulting map of substrate shear stress at Rongelap is displayed in Figure 2. Figure 2 Benthic shear stress of Rongelap Atoll.

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