Sea surface description requirements for electromagnetic scattering calculations
Identifieur interne : 000F58 ( Istex/Corpus ); précédent : 000F57; suivant : 000F59Sea surface description requirements for electromagnetic scattering calculations
Auteurs : A. Guissard ; C. Baufays ; P. SobieskiSource :
- Journal of Geophysical Research: Oceans [ 0148-0227 ] ; 1986-02-15.
Abstract
Several fundamental and unsolved questions should be answered or clarified before new and substantial progress can be made toward a more rigorous and complete solution of the general problem of electromagnetic scattering, and of the related problem of emission, by the ocean surface. Successively discussed are the limitations of the linear surface waves theory, the assumptions implied by and the inadequacies of the method used to obtain the spatial spectrum of the sea surface from the temporal spectrum, and the poor knowledge of the spectrum angular behavior. It is stressed that the sea surface is not uniquely determined by the wind speed and that it should be depicted by a more complete set of internal parameters. Relationships between some usual sea state parameters, such as H1/3, σ, u*a, and U(z) are discussed. On the other hand the available methods for solving the electromagnetic scattering problem are briefly discussed, and it is shown that the assumptions implied by Brown's (1978) two‐scale model, based on the boundary perturbation method, are roughly satisfied when applied to the sea surface. The contribution that particular scattering mechanisms could provide to the scattered power is estimated. The azimuthal behavior of the backscattering coefficient is taken as an illustration.
Url:
DOI: 10.1029/JC091iC02p02477
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ISTEX:FAFF38B8AB4FA1460EED41CAEA7D9E23F0E18BC3Le document en format XML
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Successively discussed are the limitations of the linear surface waves theory, the assumptions implied by and the inadequacies of the method used to obtain the spatial spectrum of the sea surface from the temporal spectrum, and the poor knowledge of the spectrum angular behavior. It is stressed that the sea surface is not uniquely determined by the wind speed and that it should be depicted by a more complete set of internal parameters. Relationships between some usual sea state parameters, such as H1/3, σ, u*a, and U(z) are discussed. On the other hand the available methods for solving the electromagnetic scattering problem are briefly discussed, and it is shown that the assumptions implied by Brown's (1978) two‐scale model, based on the boundary perturbation method, are roughly satisfied when applied to the sea surface. The contribution that particular scattering mechanisms could provide to the scattered power is estimated. 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Successively discussed are the limitations of the linear surface waves theory, the assumptions implied by and the inadequacies of the method used to obtain the spatial spectrum of the sea surface from the temporal spectrum, and the poor knowledge of the spectrum angular behavior. It is stressed that the sea surface is not uniquely determined by the wind speed and that it should be depicted by a more complete set of internal parameters. Relationships between some usual sea state parameters, such as H1/3, σ, u*a, and U(z) are discussed. On the other hand the available methods for solving the electromagnetic scattering problem are briefly discussed, and it is shown that the assumptions implied by Brown's (1978) two‐scale model, based on the boundary perturbation method, are roughly satisfied when applied to the sea surface. The contribution that particular scattering mechanisms could provide to the scattered power is estimated. 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Successively discussed are the limitations of the linear surface waves theory, the assumptions implied by and the inadequacies of the method used to obtain the spatial spectrum of the sea surface from the temporal spectrum, and the poor knowledge of the spectrum angular behavior. It is stressed that the sea surface is not uniquely determined by the wind speed and that it should be depicted by a more complete set of internal parameters. Relationships between some usual sea state parameters, such as H<sub>1/3</sub>, σ, u<sub>*a</sub>, and U(z) are discussed. On the other hand the available methods for solving the electromagnetic scattering problem are briefly discussed, and it is shown that the assumptions implied by Brown's (1978) two‐scale model, based on the boundary perturbation method, are roughly satisfied when applied to the sea surface. The contribution that particular scattering mechanisms could provide to the scattered power is estimated. 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The azimuthal behavior of the backscattering coefficient is taken as an illustration.</abstract><relatedItem type="host"><titleInfo><title>Journal of Geophysical Research: Oceans</title></titleInfo><titleInfo type="abbreviated"><title>J. Geophys. Res.</title></titleInfo><genre type="journal">journal</genre><subject><genre>index-terms</genre><topic authorityURI="http://psi.agu.org/specialSection/REMOSEN1">Frontiers of Remote Sensing of the Oceans and Troposphere From Air and Space Platforms</topic><topic authorityURI="http://psi.agu.org/taxonomy5/0300">ATMOSPHERIC COMPOSITION AND STRUCTURE</topic><topic authorityURI="http://psi.agu.org/taxonomy5/0312">Air/sea constituent fluxes</topic><topic authorityURI="http://psi.agu.org/taxonomy5/0600">ELECTROMAGNETICS</topic><topic authorityURI="http://psi.agu.org/taxonomy5/0659">Random media and rough surfaces</topic><topic authorityURI="http://psi.agu.org/taxonomy5/0669">Scattering and diffraction</topic><topic authorityURI="http://psi.agu.org/taxonomy5/0689">Wave propagation</topic><topic authorityURI="http://psi.agu.org/taxonomy5/2400">IONOSPHERE</topic><topic authorityURI="http://psi.agu.org/taxonomy5/2487">Wave propagation</topic><topic authorityURI="http://psi.agu.org/taxonomy5/3200">MATHEMATICAL GEOPHYSICS</topic><topic authorityURI="http://psi.agu.org/taxonomy5/3285">Wave propagation</topic><topic authorityURI="http://psi.agu.org/taxonomy5/3300">ATMOSPHERIC PROCESSES</topic><topic authorityURI="http://psi.agu.org/taxonomy5/3339">Ocean/atmosphere interactions</topic><topic authorityURI="http://psi.agu.org/taxonomy5/4400">NONLINEAR GEOPHYSICS</topic><topic authorityURI="http://psi.agu.org/taxonomy5/4455">Nonlinear waves, shock waves, solitons</topic><topic authorityURI="http://psi.agu.org/taxonomy5/4200">OCEANOGRAPHY: GENERAL</topic><topic authorityURI="http://psi.agu.org/taxonomy5/4275">Remote sensing and electromagnetic processes</topic><topic authorityURI="http://psi.agu.org/taxonomy5/4500">OCEANOGRAPHY: PHYSICAL</topic><topic authorityURI="http://psi.agu.org/taxonomy5/4504">Air/sea interactions</topic><topic authorityURI="http://psi.agu.org/taxonomy5/6900">RADIO SCIENCE</topic><topic authorityURI="http://psi.agu.org/taxonomy5/6934">Ionospheric propagation</topic></subject><identifier type="ISSN">0148-0227</identifier><identifier type="eISSN">2156-2202</identifier><identifier type="DOI">10.1002/(ISSN)2156-2202c</identifier><identifier type="CODEN">JGREA2</identifier><identifier type="PublisherID">JGRC</identifier><part><date>1986</date><detail type="volume"><caption>vol.</caption><number>91</number></detail><detail type="issue"><caption>no.</caption><number>C2</number></detail><extent unit="pages"><start>2477</start><end>2492</end><total>16</total></extent></part></relatedItem><identifier type="istex">FAFF38B8AB4FA1460EED41CAEA7D9E23F0E18BC3</identifier><identifier type="DOI">10.1029/JC091iC02p02477</identifier><identifier type="ArticleID">5C0821</identifier><accessCondition type="use and reproduction" contentType="copyright">Copyright 1986 by the American Geophysical Union.</accessCondition><recordInfo><recordContentSource>WILEY</recordContentSource></recordInfo></mods></metadata><serie></serie></istex></record>Pour manipuler ce document sous Unix (Dilib)
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