Underwater Acoustics. Volume 2

516 Pages·10.581 MB·English

by  Bjørnø L. (Ed.)

European Commission
ISSN 1018-5593
2&3feS*sv £2s&á
Proceedings of the
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SECOND EUROPEAN CONFERENCE ON
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ACOUSTICS

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2nd EUROPEAN CONFERENCE ON
UNDERWATER
ACOUSTICS
EDITED BY
L. BJØRNØ
TECHNICAL UNIVERSITY OF DENMARK
EUROPEAN COMMISSION /JcJtßEL Ί 31 ft 9 9
PARL EUROP. Bíbíioifi.
N.C.^'ßMW-
Published by the
EUROPEAN COMMISSION
Directorate-General XIII
Telecommunications, Information Market and Exploitation of Research
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LEGAL NOTICE
Neither the European Commission nor any person acting on behalf of the Commission is
responsible for the use which might be made of the following information
Cataloguing data can be found at the end of this publication
Luxembourg: Office for Official Publications of the European Communities, 1994
ISBN 92-826-8000-2
© ECSC-EC-EAEC, Brussels · Luxembourg, 1994
Printed in Belgium
2nd EUROPEAN CONFERENCE ON
UNDERWATER ACOUSTICS
VOLUME II
Proceedings of the 2nd European Conference on Underwater Acoustics, held at the Technical
University of Denmark, Lyngby, Denmark, 4-8 July 1994, sponsored by the Commission of the
European Communities in collaboration with the Federation of the Acoustical Societies of Europe,
the Deutsche Akustische Gesellschaft, the Sociedad Española de Acústica, the Société Française
d'Acoustique, the Associazione Italiana di Acustica and the Institute of Acoustics.
Scientific Committee
Professor L. Bjørnø Federation of Acoustical Societies of Europe,
(Chairman) Lyngby, Denmark
Dr. G.B. Cannelli Rome, Italy
Dr. R. Carbó Madrid, Spain
Dr. K. Kremer Bremen, Germany
Dr. J.R. Nedwell Eastleigh, UK
Professor J. Papadakis Heraklion, Greece
Dr. M. Weydert CEC-DGXII/D, Brussels, Belgium
Dr. M. Zakharia Lyon, France
Local Organizing Committee
Professor L. Bjørnø (Chairman)
Dr. I. K. Bjørnø
Mr. S. Engelbrecht
Dr. P. Louring Nielsen
Conference Secretariat
2nd European Conference on Underwater Acoustics
Department of Industrial Acoustics
Technical University of Denmark
Building 425
DK-2800 Lyngby, Denmark
Phone: [phone]
Fax: [phone]
Contents
VOLUME I
PLENARY PAPERS 1
Seismo­acoustics of the arctic ice cover 3
H. Schmidt
Acoustic tomography of ocean climate 15
W H. Munk
AMBIENT NOISE 17
INVITED PAPER: Determination of elastic sea floor parameters from shallow­
water ambient noise 19
M.J. Buckingham · G.B. Deane · JV.AÍ. Carbone
INVITED PAPER: Recent developments in the passive detection of breaking
surface waves 27
D.M. Farmer· L. Ding
The Influence of swell, icebergs and grease ice on ambient noise 33
O.M. Johannessen · H. Sagen · S. Sandven · /. Engelsen
An underwater acoustic study: From the concept to experiment of the SNECOW
project 39
F. Grassia · L. Minna · S. Pagnan · G. Tacconi · A Tesei · A. Tiano
A comparative H.O.S. estimation of class Β non­gaussian underwater acoustic
noise 45
F. Borghini · G. Tacconi · A. Tiano
Ambient noise database environment tool set: Conceptual method 51
J.L Espérandieu · M. Cezon · S. Bois
Non­linear excitation of collective oscillations of fresh and salt water bubble plu­
mes 63
G.J. Orris · M. Nicholas · M. Querijero
Linear pressure waves in bubbly fluids in the non­interacting regime 71
J.L. Leander
Ship radiated noise measurements on sea: Separation of ambient traffic noise
from the measured signatures 75
B. Gamier · J. Millet · J. Larcher · G. Goullet
vi Con ten ts
REVERBERATION 81
Deterministic reverberation from the Mid­Atlantic ridge 83
N.C. Makris · R. Menis · L. Avelino · J.M. Berkson
Calculations of reverberation by applying back scattering functions 89
P.L. Nielsen · L. Bjørnø
Backscatter reduction through single mode excitation 95
D.F. Gingras
Far low frequency sound reverberation in the ocean 101
D.I. Abrosimov · V.S. Averbakh · E.I. Bolonicheva · L.S. Doiin · V.Yu.
Goldbiut . V.N. Golubev . A.G. Nechaev . K.E. Pigalov · N.I. Sirotkina.
Characteristic properties of bottom backscattering in the south Baltic sea 105
Z. Klusek · A. Sliwinski · J. Tegowski
Sea bed roughness dependence on acoustic pulse length at normal incidence 111
G.J. Heald . N.G. Pace
SCATTERING 117
INVITED PAPER: Benchmark solutions for backscattering in simple waveguide
geometries 119
F.B. Jensen · P. Gerstoft
INVITED PAPER: Resonance properties of sub­surface bubble clouds 125
I.K. Bjørnø » L. Bjørnø
INVITED PAPER: Attenuation and scattering by bubbles and their influence
on surface backscattering strength 133
H. Herwig · Β. Nützet
INVITED PAPER: Modelling of acoustic volume reverberation to estimate ve­
locity, refraction index and turbulence profiles 141
S.D. Kamminga · A. Plaisant · C. Camporeale · D. Nijveldt · H.0. Madsen
Acoustical scattering by a tube and observation of guided waves at large incidence
angles 147
F. Léon · G'. Maze
Experimental and theoretical study of the sound scattering by the axial ribbed
cylindrical shell 153
A. Klauson · D. Décultot · G. Maze · J. Metsaveer
Resonances of deformed cylindrical shells­experimental visualization and identi­
fication 159
P.A. Chinnery · V.F. Humphrey
Diffraction of the acoustical fields by the elastic bodies in oceanic waveguides:
Solution by the combine integral method 165
V.E. Belov . S.M. Gorsky · A.Yu. Zinov'ev . A.I. Khil'ko
Scattering of plane waves from elastic spheres with surface roughnesses 171
S. Sun · L. Bjørnø
Contents vii
Experimental validation of a volume reverberation model 177
S.D. Kamminga · P.S. Griffioen
Backscattered signal from propeller blades 183
M. Tran Van Nhieu
Acoustic scatter from a dynamic rough surface and its influence on short-range,
high-frequency signal propagation 189
C. Bjerrum-Niese · L. Bjørnø
Can near-surface bubble clouds and plumes lead to anomalous perturbations in
low-frequency sea-surface scattering? 195
R.A. Roy . J.A. Schindall . W.M. Carey . I.A. Crum
Acoustic bubble sizing using two frequency excitation techniques 201
A.D. Phelps . T.G. Leighton
The low-frequency radiation and scattering of sound from bubbly mixtures near
the sea surface 207
W.M, Carey RA. Roy
Wave scattering in an irregular elastic layer adjoining a fluid half-space 213
M. Spivack · J.D. Sheard
Influence of the sea movement induced by swell on the scattering of an acoustic
plane wave 219
F. Coulouvrat · M. Rousseau
Scattered sound angular-frequency spectra of the ocean wind perturbed surface:
Application and numerical investigation of the small-slope method 225
M. Galaktionov
Sound scattering from gas bubbles in the sea-numerical consideration of coherence
and interaction effects 231
J. Szczucka
Reference measurements and estimator validation for acoustical volume rever
beration measurements 237
D. Nijveldt
Wideband waveforms for incoherent Doppler current profiling and related pro
cessing 243
F. Andreucci · C. Camporeale
Acoustic experiments to test estimators for velocity 249
S.D. Kamminga · R.F. van Unen · J.J. Bosman
Acoustic backscattering by particles in turbulent flows: Space and time cross-
correlation functions of backscattered pressures and powers 255
X. Cristol
Theoretical and experimental analysis of scattering interactions between a cylin
drical receiving array and neighbouring structures 261
A. Monsallier · F. Lantén · C. Audoly
Limitations of spherical array performance due to scattering interactions with a
neighbouring acoustic barrier 267
F. Lanieri · C. Audoly
viii Contents
Seasonal and diurnal changes of biological backscattering patterns in the southern
Baltic sea 273
J. Szczucka · Z. Klusek · A. Sllwinski
Measurement and calculation of the acoustic characteristics of fibre-reinforced
panels-the influence of anisotropy 279
V.F. Humphrey · P.A. Chinnery
Moments and angular distribution for wave scattering at low grazing angles from
a rough surface 285
M. Spivack
On the possibility of reconstructing the anisotropic wind wave spectrum by the
method of double-position hydrolocation 291
L.S. Dolin · M.I. Kondratyeva
Combined FEM-BEM approach for determination of the scattered or radiated
field from an elastic shell 297
A. Kăes · A. Lahe · J. Metsaveer · U. Ross
Sound scattering by a spherical lens with reflector 303
N.N. Makarchenko * V.N. Sakhno
SOUND PROPAGATION MODELING AND MEASUREMENTS 309
INVITED PAPER: Shallow-water sound transmission measurements taken on
the New Jersey continental shelf 311
W.M. Carey · J. Doutt · R. Evans · W.L. Siegmann · β. Cederberg
INVITED PAPER: Characterizing parameter spaces 319
L. Fishman · M.D. Collins
INVITED PAPER: Recent progress in parabolic equation modeling 325
M.D. Collins · W.A. Kuperman · W.L. Siegmann
Modal attenuation due to fish 331
O. Diachok
Parametric modelling of reflection and transmission experiments on viscoelastic
layers 337
L. Peirlinckx · R. Pintelon · L. Van Biesen
Propagation of Lamb waves in alternated solid-liquid media 345
O. Lenoir * H. Khelil · J.L. Izbicki · M. Rousseau · F. Coulouvrat
A new simulation in underwater acoustic 351
G. Rabau · J. Piraux · J. Leandre · R. Holtzer
A mixed variational FEM/BEM model for submerged elastic structures with thin
appendages 357
J.P. Coyette· O. Bjorndahl
An efficient finite element methode for the PE 363
V.A. Dougalis · N.A. Kampanis · E.A. Vavalis
ADCP-measured fluxes through channels of the North Frisian sea and modelling
results 369
M. Kolb . E. Rudolph . H. Schiller