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Titolo:
PHOTON TRANSPORT IN 3-DIMENSIONAL STRUCTURES TREATED BY RANDOM-WALK TECHNIQUES - MONTE-CARLO BENCHMARK OF OCEAN COLOR SIMULATIONS
Autore:
DOYLE JP; RIEF H;
Indirizzi:
COMMISS EUROPEAN COMMUNITIES,JOINT RES CTR,MARINE ENVIRONM UNIT,SPACEAPPLICAT INST I-21020 ISPRA ITALY UNIV LONDON IMPERIAL COLL SCI TECHNOL & MED,CTR ENVIRONM TECHNOL,APPLCOMPUTAT & MODELLING GRP LONDON SW7 2AZ ENGLAND
Titolo Testata:
Mathematics and computers in simulation
fascicolo: 2-5, volume: 47, anno: 1998,
pagine: 215 - 241
SICI:
0378-4754(1998)47:2-5<215:PTI3ST>2.0.ZU;2-9
Fonte:
ISI
Lingua:
ENG
Soggetto:
UNDERWATER;
Keywords:
OCEAN OPTICS; PHOTON TRANSPORT; MONTE CARLO SIMULATIONS; MONTE CARLO PERTURBATION AND SENSITIVITY ANALYSIS;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
CompuMath Citation Index
CompuMath Citation Index
CompuMath Citation Index
Science Citation Index Expanded
Science Citation Index Expanded
Science Citation Index Expanded
Citazioni:
32
Recensione:
Indirizzi per estratti:
Citazione:
J.P. Doyle e H. Rief, "PHOTON TRANSPORT IN 3-DIMENSIONAL STRUCTURES TREATED BY RANDOM-WALK TECHNIQUES - MONTE-CARLO BENCHMARK OF OCEAN COLOR SIMULATIONS", Mathematics and computers in simulation, 47(2-5), 1998, pp. 215-241

Abstract

The analysis of light-rays penetrating transparent media like air andwater constitutes a pertinent problem in climatic research and in thedevelopment of algorithms for the retrieval of bio-geo-chemical parameters of suspended matter and dissolved pollutants from remotely sensed ocean colour data. On the basis of the neutron transport code TIMOC a visible and near-infrared photon transport code, called PHO-TRAN, has been developed and tested both against a theoretical benchmark of models and on real data. The photon transport allows for reflection, refraction, absorption and all relevant light-scattering models, such as elastic scattering by molecules and strongly forward scattering processes by particulates, in quite general three-dimensional geometries. The scores are flux, radiance, irradiance, averaged over regions or surfaces as well as point detectors. In some cases it is also possible to solve the adjoint problem, as for example in the case of strongly collimated light sensors with extended sources. Adjoint problems - as encountered when complex geometry structures are to be considered in the vicinity of a detector - are solved to evaluate the effects of sensor shadowing and self-shadowing, in order to provide vicarious calibrationinformation for operational satellite remote sensors. While the features listed above, are not all unique, PHO-TRAN offers also the possibility to sample first-order derivatives of almost all responses with respect to certain input parameters, like material densities and characteristic constants used in scattering models. The knowledge of derivatives, which can be determined with very little supplementary computing effort, provides valuable additional information which provides sensitivity profiles and allows for multivariate perturbation estimates, uncertainty analysis and data adjustment. This paper describes mainly thebenchmarking of the developed Monte Carlo procedures. (C) 1998 IMACS/Elsevier Science B.V.

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Documento generato il 28/09/20 alle ore 21:52:07