Geostatistical modeling of sound propagation: principles and a field application experiment

BAUME ; GAUVREAU ; BERENGIER ; JUNKER ; WACKERNAGEL ; CHILES

Type de document
ARTICLE A COMITE DE LECTURE REPERTORIE DANS BDI (ACL)
Langue
anglais
Auteur
BAUME ; GAUVREAU ; BERENGIER ; JUNKER ; WACKERNAGEL ; CHILES
Résumé / Abstract
The assessment of noise sources for environmental purposes requires reliable methods for mapping. Numerical models are well adapted for sophisticated simulations and sensitivity analyses; however real-time mapping of large frequency bands must be based on fast and acceptable computations and honor in situmeasurements. In this paper a real-time mapping procedure of noise exposure is proposed. The procedure is based on geostatistical modeling of spatial variations and applied to a case study taken from an experimental campaign where a point source was placed on a flat meadow. An analytical approximation of the acoustic field was first computed with the Embleton model. The difference between this approximation and the actual measurements (Leq15min 1/3-octave bands samples from 19 microphones spread over the meadow) showed spatial structure which has been modeled with a variogram. Finally the geostatistical technique of kriging with external drift provided an optimal interpolation of the acoustic field data while encapsulating the first approximation from the Embleton model. Systematic geostatistical inference and real-time mapping with the proposed procedure can be envisaged in simple cases.
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