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Moment-screen method for wave propagation in a refractive medium with random scattering
- DOI:
- 10.1080/17455030802647462
pages 369-391
Available online: 06 Jul 2009Abstract
Direct numerical solution of a parabolic equation (PE) for the second moment of the sound field in a refracting medium with random scattering is described. The method determines the mean-square sound pressure without requiring generation of random realizations of the propagation medium. The second-moment matrix is factored into components that are independently propagated with a conventional PE algorithm. A moment screen is periodically applied to attenuate the coherence of the wavefield, much as phase screens are often applied in the method of random realizations. An example involving upwind and downwind propagation in the near-ground atmosphere shows that the new direct method converges to an accurate solution faster than the method of random realizations and is particularly well suited to calculations at low frequencies.
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- Citation information:
- Available online: 06 Jul 2009
Author affiliations
- a US Army Engineer Research and Development Center, Hanover, NH, 03755-1290, USA
- b NOAA/Earth System Research Laboratory, Boulder, CO, 80305, USA
- c Physics Department, New Mexico State University, Las Cruces, NM, 88003, USA
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