High frequency quasi-normal waves for nonstationary deep-water waveguide

Author

Aref´ev, A.V. ; Buldyrev, V.S.

Author_Institution

Dept. of Math. Phys., St. Petersburg Univ., Russia

fYear

2001

fDate

2001

Firstpage

18

Lastpage

25

Abstract

The propagation of nonharmonic acoustic waves in ocean refractive waveguide with slowly varying properties in horizontal directions and time is treated. The waveguide is modulated as water layer with plane boundaries. The wavelength is assumed to be small in comparison with the width of the layer. A set of asymptotic solutions of the wave equation called as quasi-normal waves is constructed. Our approach extends the applicability region of the well known method of normal waves when the adiabatic expansion failed. A unified formal procedure for construction of the quasi-normal waves is proposed

Keywords

acoustic wave refraction; inhomogeneous media; oceanographic techniques; underwater acoustic propagation; wave equations; waveguide theory; HF quasi-normal waves; adiabatic expansion; asymptotic solutions; harmonic oscillations; high frequency quasi-normal waves; horizontal direction; layer width; nonharmonic acoustic wave propagation; nonstationary deep-water waveguide; ocean refractive waveguide; plane boundaries; slowly varying properties; stratified media; water layer; wave equation; Acoustic propagation; Acoustic refraction; Acoustic waveguides; Acoustic waves; Frequency; Laplace equations; Oceans; Partial differential equations; Physics; Planar waveguides;

fLanguage

English

Publisher

ieee

Conference_Titel

Day on Diffraction 2001. Proceedings. International Seminar

Conference_Location

St.Petersburg

Print_ISBN

5-7997-0366-9

Type

conf

DOI

10.1109/DD.2001.988451

Filename

988451