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Proceedings Paper

Remote sensing of oil films on the water surface using radar
Author(s): S. Ermakov; J. C. B. da Silva; I. Kapustin; I. Sergievskaya
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Paper Abstract

Results of field experiments on radar imaging of surfactant films using satellite SAR (TerraSAR-X) co-located with Xband and Ka-band radar (scatterometer) measurements are described and analyzed. The experiments were performed using surfactant films with pre-measured physical parameters, the surface tension and the film elasticity, at low to moderate wind and at different radar incidence angles. Contrasts characterizing depression of radar backscatter in slicks have been obtained. Theoretical analysis of radar contrasts for low-to-moderate incidence angles has been carried out based on a hydrodynamic model of wind wave damping due to films and on a composite radar imaging model. The hydrodynamic model takes into account wave damping due to viscoelastic films, wind wave generation and a phenomenological term describing nonlinear limitation of the wind wave spectrum. The radar model takes into account Bragg scattering and specular scattering, the latter is usually negligible compared to the Bragg effect at moderate incidence angles (larger than 30-35 degrees), but is obtained to give noticeable contribution to radar backscattering at smaller incidence angles particularly for slick areas when cm-scale ripples is strongly depressed by films. Theoretical calculations of radar contrasts in slicks are compared with experiment.

Paper Details

Date Published: 19 October 2012
PDF: 6 pages
Proc. SPIE 8532, Remote Sensing of the Ocean, Sea Ice, Coastal Waters, and Large Water Regions 2012, 85320M (19 October 2012); doi: 10.1117/12.974387
Show Author Affiliations
S. Ermakov, Institute of Applied Physics (Russian Federation)
J. C. B. da Silva, Univ. do Porto (Portugal)
I. Kapustin, Institute of Applied Physics (Russian Federation)
I. Sergievskaya, Institute of Applied Physics (Russian Federation)

Published in SPIE Proceedings Vol. 8532:
Remote Sensing of the Ocean, Sea Ice, Coastal Waters, and Large Water Regions 2012
Charles R. Bostater; Stelios P. Mertikas; Xavier Neyt; Caroline Nichol; Dave Cowley; Jean-Paul Bruyant, Editor(s)

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