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Titolo:
CROSS-CORRELATED RANDOM-FIELD GENERATION WITH THE DIRECT FOURIER-TRANSFORM METHOD
Autore:
ROBIN MJL; GUTJAHR AL; SUDICKY EA; WILSON JL;
Indirizzi:
UNIV OTTAWA,DEPT GEOL OTTAWA K1N 6N5 ONTARIO CANADA NEW MEXICO INST MIN & TECHNOL,DEPT MATH SOCORRO NM 87801 UNIV WATERLOO,DEPT EARTH SCI,WATERLOO CTR GROUNDWATER RES WATERLOO N2L 3G1 ONTARIO CANADA
Titolo Testata:
Water resources research
fascicolo: 7, volume: 29, anno: 1993,
pagine: 2385 - 2397
SICI:
0043-1397(1993)29:7<2385:CRGWTD>2.0.ZU;2-C
Fonte:
ISI
Lingua:
ENG
Soggetto:
GROUNDWATER-FLOW PARAMETERS; WASTE MANAGEMENT SITES; TURNING BANDS METHOD; STOCHASTIC-ANALYSIS; HYDRAULIC CONDUCTIVITY; SPATIAL VARIABILITY; SOLUTE TRANSPORT; DIMENSIONAL SIMULATIONS; ENGINEERING DESIGN; REGULATORY POLICY;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Science Citation Index Expanded
Science Citation Index Expanded
Citazioni:
44
Recensione:
Indirizzi per estratti:
Citazione:
M.J.L. Robin et al., "CROSS-CORRELATED RANDOM-FIELD GENERATION WITH THE DIRECT FOURIER-TRANSFORM METHOD", Water resources research, 29(7), 1993, pp. 2385-2397

Abstract

This paper presents a computer algorithm that is capable of cogenerating pairs of three-dimensional, cross-correlated random fields. The algorithm produces random fields of real variables by the inverse Fourier transform of a randomized, discrete three-dimensional spectral representations of the variables. The randomization is done in the spectraldomain in a way that preserves the direct power and cross-spectral density structure. Two types of cross spectra were examined. One type specifies a linear relationship between the two fields, which produces the same correlation scales for both variables but different variances. The second cross spectrum is obtained from a specified transfer function and the two power spectra, and it produces fields with different correlation scales. For both models the degree of correlation is specified by the coherency. A delay vector can also be specified to produce an out-of-phase correlation between the two fields. The algorithm is very efficient computationally, is relatively easy to use, and does notproduce the lineation problems that can be encountered with the turning bands method. Perhaps most important, this random field generator is capable of co-generating cross-correlated random fields.

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Documento generato il 03/12/20 alle ore 06:05:48