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Proceedings Paper

Discrete-angle radiative transfer in a multifractal medium
Author(s): Anthony B. Davis; Shaun Lovejoy; Daniel Schertzer
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Paper Abstract

A simplified (discrete angle, DA) radiative transfer theory is presented as a computationally and conceptually advantageous alternative to standard (continuous angle) theory. After briefly reviewing the basic ideas of random fractal geometry and multifractal cascade theory, we present some of our recent two-dimensional DA numerical simulations of transfer through a specific log-normal multifractal cloud model where the radiation fields are spatially resolved on a 1024 x 1024 point grid. Using this data base, we demonstrate (1) how in inhomogeneous transfer problems horizontal fluxes work in quite subtle ways to create dramatic overall differences with homogeneous predictions for the same amount of scattering material, and (2) how strongly multiple scattering can smooth extremely singular density fields. Furthermore, both of these effects are enhanced by increasing optical thickness which can be viewed as a measure of the strength of the nonlinear coupling between the density and radiance fields. Finally, we discuss some basic inequalities that arise between the various ways of computing overall (spatially averaged) response to illumination.

Paper Details

Date Published: 11 November 1991
PDF: 23 pages
Proc. SPIE 1558, Wave Propagation and Scattering in Varied Media II, (11 November 1991); doi: 10.1117/12.49612
Show Author Affiliations
Anthony B. Davis, McGill Univ. (United States)
Shaun Lovejoy, McGill Univ. (Canada)
Daniel Schertzer, Meteorologie Nationale (France)

Published in SPIE Proceedings Vol. 1558:
Wave Propagation and Scattering in Varied Media II
Vijay K. Varadan, Editor(s)

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