ASTER bathymetry in computational fluid dynamic simulation of Rongelap Atoll hydrodynamics, Marshall Islands Author : E.L. Peterson

WHAT IS THIS DOCUMENT ABOUT? : 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 B-Spline) 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

Keywords	:	Atoll Hydrodynamics Remote Sensing
file credit	:	E.L. Peterson
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file address	:	www.nova.edu/ncri/11icrs/proceedings/files/m15-05.pdf

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