Skip navigation
Skip navigation

Stochastic features of scattering

Hong, Tae-Kyung; Wu, Ru-Shan; Kennett, Brian

Description

The characteristics of scattering of scalar waves in stochastic random media are investigated in through the behaviour of the meanfield, scattering attenuation, and transmission fluctuations of amplitude and phase. Coherent scattered waves develop with increase of perturbation level, with the strength of the coherency varying with the type of media. The frequency content of the coherent scattered waves is close to that of the incident waves, and the phase is dependent on the statistical effect...[Show more]

dc.contributor.authorHong, Tae-Kyung
dc.contributor.authorWu, Ru-Shan
dc.contributor.authorKennett, Brian
dc.date.accessioned2015-12-13T23:01:55Z
dc.identifier.issn0031-9201
dc.identifier.urihttp://hdl.handle.net/1885/84648
dc.description.abstractThe characteristics of scattering of scalar waves in stochastic random media are investigated in through the behaviour of the meanfield, scattering attenuation, and transmission fluctuations of amplitude and phase. Coherent scattered waves develop with increase of perturbation level, with the strength of the coherency varying with the type of media. The frequency content of the coherent scattered waves is close to that of the incident waves, and the phase is dependent on the statistical effect of the heterogeneities along the propagation path. The normalized scattering attenuation (Qs-1/ ε2) is stable at low normalized wavenumbers (ka < 1) regardless of the perturbation strength, but varies with the perturbation strength at high normalized wavenumbers (ka > 1). The coherent scattered waves, which strengthen with the perturbation level, add energy to the primary waves and reduce the apparent scattering attenuation. Stable measurements of normalized scattering attenuation can be made for sufficiently large distances. An empirical distance criterion for such stable measurements of scattering attenuation is presented in terms of propagation distance, incident wavelength, and the correlation length of the heterogeneities in the medium. The transmission fluctuation of amplitude and phase shows a high variation at large spatial lags, and the trend of the variation is dependent on the nature of heterogeneities. The ensemble average of amplitude fluctuation closely follows the theoretical prediction, but rather poor agreement is displayed for phase fluctuation. The effect of self-averaging during propagation in random media can not replace the ensemble averaging for mean transmission fluctuations of the amplitude and phase in random media.
dc.publisherElsevier
dc.sourcePhysics of the Earth and Planetary Interiors
dc.subjectKeywords: Perturbation techniques; Random processes; Statistical methods; Scalar waves; Scattering attenuation; Stable measurements; Transmission fluctuations; Electromagnetic wave scattering; numerical model; stochasticity; wave scattering Meanfield; Numerical modelling; Scalar waves; Scattering; Scattering attenuation; Stochastic effect; Transmission fluctuation; Wavelet-based method; Wavelets
dc.titleStochastic features of scattering
dc.typeJournal article
local.description.notesImported from ARIES
local.description.refereedYes
local.identifier.citationvolume148
dc.date.issued2005
local.identifier.absfor040403 - Geophysical Fluid Dynamics
local.identifier.ariespublicationMigratedxPub12917
local.type.statusPublished Version
local.contributor.affiliationHong, Tae-Kyung, University of California
local.contributor.affiliationWu, Ru-Shan, University of California
local.contributor.affiliationKennett, Brian, College of Physical and Mathematical Sciences, ANU
local.description.embargo2037-12-31
local.bibliographicCitation.startpage131
local.bibliographicCitation.lastpage48
local.identifier.doi10.1016/j.pepi.2004.08.002
dc.date.updated2015-12-12T07:43:42Z
local.identifier.scopusID2-s2.0-13144297788
CollectionsANU Research Publications

Download

File Description SizeFormat Image
01_Hong_Stochastic_features_of_2005.pdf679.32 kBAdobe PDF    Request a copy


Items in Open Research are protected by copyright, with all rights reserved, unless otherwise indicated.

Updated:  19 May 2020/ Responsible Officer:  University Librarian/ Page Contact:  Library Systems & Web Coordinator