Physics
Scientific paper
Jun 1988
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988georl..15..565g&link_type=abstract
Geophysical Research Letters (ISSN 0094-8276), vol. 15, June 1988, p. 565-568.
Physics
8
Aerodynamic Coefficients, Radar Scattering, Remote Sensing, Sediment Transport, Surface Roughness, Wind Effects, Dielectrics, Dust, Lava, Sands, Scatterometers, Velocity Distribution, Velocity Measurement
Scientific paper
The ability of the wind to move particles and the flux of windblown sand are both dependent on the topographic roughness of the surface, as measured by the aerodynamic roughness, z(0). For most surfaces, topographic roughness controls many of the characteristics of the radar return, and the magnitude of the radar backscatter can be regarded as a measure of the surface roughness at or near the wavelength scale. Radar backscatter data may therefore be useful in obtaining a value of aerodynamic roughness which can be used to assess aeolian sediment transport via remote sensing. In this study, calibrated L(HH), C(HH) and Ku(VV) radar data were used to derive characteristic backscatter coefficients sigma(0) for three lava flow units, an alluvial fan, and a playa surface. Preliminary analyses show that values of sigma(0) and z(0) both increase with topographic roughness and that there is a good correlation between the two coefficients. This correlation suggests that it may be possible to assess aerodynamic roughness directly from radar data.
Dobrovolskis Anthony
Greeley Ronald
Lancaster Nicholas
Saunders Stephen R.
Sullivan Robert John Jr.
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