Physics – Geophysics
Scientific paper
Feb 2004
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004icar..167..453g&link_type=abstract
Icarus, Volume 167, Issue 2, p. 453-463.
Physics
Geophysics
1
Geophysics, Fractal Surfaces, Experimental Techniques, Backscattering
Scientific paper
A homogeneous resin print of the surface of a naturally-fractured granite block with an experimental Hurst exponent H~=0.7 is placed in a water tank. An acoustisource insonifies the surface in a near-nadir direction and the backscattered waves are recorded near the source. Such measurements are made at different positions along a profile above the surface in order to obtain the energy spectrum of the mean backscattered wavefield. The wavelength range considered is 0.58<=λ<=8.72 mm in water. A synthetic energy spectrum is obtained from a model [Shepard and Campbell, Icarus 141 (1999) 156] which represents the rough surface as an ensemble of point scatterers and assumes a single-scattering regime. This model reasonably fits with the experimental spectrum with the largest discrepancies observed for λ<2.5 mm. The fit is improved in the whole wavelength interval by accounting for the long-range topography variations occurring along the averaging profile.
Gautier Stéphanie
Gibert Dominique
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