Analysis of pulse propagation in a bottom-limited sound channel with a surface duct

C. L. Monjo, Harry A Deferrari

Research output: Contribution to journalArticle

12 Citations (Scopus)

Abstract

Measurements of acoustic transmission in a bottom-limited sound channel with a surface duct, are compared with model predictions using broadband ray, normal mode, fast-field, and parabolic approximation methods. At a range of 42 km, six surface-ducted arrivals are evident in the data set and are predicted by all models except simple ray theory. Surface-ducted propagation is compared to propagation without a surface duct. The surface duct is found to generate a series of modes which display a resonance between the highly dispersive surface reflected bottom reflected (SRBR) propagation and less dispersive refracted bottom reflected (RBR) propagation. The six arrivals contain energy from three types of propagation paths. Faster precursors are purely diffracted energy, while slower precursors have RBR and SRBR contributions. Ray theory predicts the SRBR contribution, but not the diffracted energy. The precursors are generated at discrete ranges where RBR and SRBR phase fronts exchange energy with the RSR phase front in the duct. Energy leaking from the duct also reenforces the slower precursors. Since range-independent models were used, mode coupling cannot be the cause of energy exchange.

Original languageEnglish (US)
Pages (from-to)3129-3148
Number of pages20
JournalJournal of the Acoustical Society of America
Volume95
Issue number6
DOIs
StatePublished - 1994

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ducts
propagation
acoustics
pulses
energy
rays
arrivals
energy transfer
analysis
sound
Sound
Pulse
coupled modes
Energy
broadband
Precursor
causes
prediction
predictions
approximation

ASJC Scopus subject areas

  • Earth and Planetary Sciences(all)
  • Environmental Science(all)
  • Acoustics and Ultrasonics

Cite this

Analysis of pulse propagation in a bottom-limited sound channel with a surface duct. / Monjo, C. L.; Deferrari, Harry A.

In: Journal of the Acoustical Society of America, Vol. 95, No. 6, 1994, p. 3129-3148.

Research output: Contribution to journalArticle

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