Spectral properties of the interference head wave
- Authors
- Choi, Jee Woong; Dahl, Peter H.
- Issue Date
- Jul-2007
- Publisher
- Acoustical Society of America
- Citation
- Journal of the Acoustical Society of America, v.122, no.1, pp.146 - 150
- Indexed
- SCIE
SCOPUS
- Journal Title
- Journal of the Acoustical Society of America
- Volume
- 122
- Number
- 1
- Start Page
- 146
- End Page
- 150
- URI
- https://scholarworks.bwise.kr/erica/handle/2021.sw.erica/43570
- DOI
- 10.1121/1.2743156
- ISSN
- 0001-4966
- Abstract
- The interference head wave propagating through a sediment with a linear sound speed gradient is studied as a function of the parameter zeta, which is itself a function of acoustic frequency f, sediment sound speed and its gradient, and range. For zeta< 1 the amplitude spectrum of the interference head waves goes as vertical bar S(f)vertical bar /f, where S(f) is the source spectrum. For increasing zeta beyond unity a more complicated modulation of S(f) ensues, which is explained by a channel transfer function H-1(f), constructed analytically from a summation of terms involving zeroth-order refracted waves (referred to as a ray approach). For zeta greater than or similar to 2 this summation compares well with a wave theory result for the interference head wave involving a fluid-fluid boundary. The amplitude spectrum of the interference head wave in the absence of sediment attenuation is vertical bar S(f)vertical bar center dot vertical bar H-1(f)vertical bar and it is essential to know these to obtain an estimate of sediment attenuation from field observations. Examples of vertical bar S(f)vertical bar center dot vertical bar H-1(f)vertical bar are presented for which H-1(f) is computed directly using the ray approach and indirectly using the parabolic wave equation. A brief discussion on the application of these results towards the inversion of sediment attenuation is given. (c) 2007 Acoustical Society of America.
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Collections - COLLEGE OF SCIENCE AND CONVERGENCE TECHNOLOGY > DEPARTMENT OF MARINE SCIENCE AND CONVERGENCE ENGINEERING > 1. Journal Articles
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