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Simulating Realistic-Looking Sediment Ripple Fields

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4 Author(s)
Dajun Tang ; Appl. Phys. Lab., Univ. of Washington, Seattle, WA, USA ; Frank S. Henyey ; Brian T. Hefner ; Peter A. Traykovski

Sandy sediment ripples impact sonar performance in coastal waters through Bragg scattering. Observations from data suggest that sandy ripple elevation relative to the mean seafloor as a function of the horizontal coordinates is not Gaussian distributed; specifically, peak amplitude fading over space associated with a random Gaussian process is largely absent. Such a non-Gaussian nature has implications for modeling acoustic scattering from, and penetration into, sediments. An algorithm is developed to generate ripple fields with a given power spectrum; these fields have non-Gaussian statistics and are visually consistent with data. Higher order statistics of these ripple fields and their implications to sonar detection are discussed.

Published in:

IEEE Journal of Oceanic Engineering  (Volume:34 ,  Issue: 4 )