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The Role of Benchmarks in the Inversion of Low Frequency Bottom Reverberation

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Author: Ainslie, M.A. · Boek, W. · Nielsen, P.L. · Harrison, C.H.
Type:article
Date:2007
Institution: TNO Defensie en Veiligheid
Source:Underwater Acoustic Measurements: Technologies & Results - 2nd International Conference & Exhibition UAM 2007, 25 - 29 June 2007, Heraklion, Crete, Greece, 777-784
Identifier: 220908
Keywords: Low frequency active sonar · Reverberation benchmarks · Geoacoustic inversion

Abstract

A measurement of reverberation provides an opportunity to estimate geoacoustic parameters of the seabed by searching the relevant parameter space for a combination of inputs that, when fed into a reverberation model, best matches the measured data. The success of this process relies in part on the accuracy of the reverberation model used. In turn, in order to assess the accuracy of the forward model it is necessary to have a set of known scenarios for which the correct solution is known. Results from a recent reverberation modelling workshop provide a suitable set of scenarios if accurate solutions can be established for them. Particular cases considered in the present article involve shallow water bottom reverberation for frequencies between 250 Hz and 3.5 kHz, and a water depth of 100 m. Results are presented using various reverberation models based on ray, flux and normal mode theory. Comparisons are made with results from other workshop participants. Confidence in the solution accuracy varies from problem to problem. Likely accuracy is assessed by the extent to which the results of different modelling approaches are in agreement with one another