Catalogo Articoli (Spogli Riviste)
OPAC HELP
Titolo: PHOTON TRANSPORT IN 3DIMENSIONAL STRUCTURES TREATED BY RANDOMWALK TECHNIQUES  MONTECARLO BENCHMARK OF OCEAN COLOR SIMULATIONS
Autore: DOYLE JP; RIEF H;
 Indirizzi:
 COMMISS EUROPEAN COMMUNITIES,JOINT RES CTR,MARINE ENVIRONM UNIT,SPACEAPPLICAT INST I21020 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: 25,
volume: 47,
anno: 1998,
pagine: 215  241
 SICI:
 03784754(1998)47:25<215:PTI3ST>2.0.ZU;29
 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 3DIMENSIONAL STRUCTURES TREATED BY RANDOMWALK TECHNIQUES  MONTECARLO BENCHMARK OF OCEAN COLOR SIMULATIONS", Mathematics and computers in simulation, 47(25), 1998, pp. 215241
Abstract
The analysis of lightrays penetrating transparent media like air andwater constitutes a pertinent problem in climatic research and in thedevelopment of algorithms for the retrieval of biogeochemical 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 nearinfrared photon transport code, called PHOTRAN, 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 lightscattering models, such as elastic scattering by molecules and strongly forward scattering processes by particulates, in quite general threedimensional 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 selfshadowing, in order to provide vicarious calibrationinformation for operational satellite remote sensors. While the features listed above, are not all unique, PHOTRAN offers also the possibility to sample firstorder 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.
ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 28/09/20 alle ore 21:52:07