Comparison of sound speed profile interpolation methods with measured data – Effects on modelled transmission loss

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Authors
  1. Tollefsen, C.D.S.
  2. Pecknold, S.
Corporate Authors
Defence R&D Canada - Atlantic, Dartmouth NS (CAN)
Abstract
The Bellhop underwater acoustic propagation model was used to investigate the effects of using linear, triangular, and trapezoidal interpolation schemes for incorporating multiple sound speed profiles (SSPs) into range-dependent modelling. Measured and modelled transmission loss (TL) were compared to determine whether there was any clear advantage to using either a series of direct SSP measurements or a series of SSPs interpolated between two or more profiles in a series. Model-measurement differences ranged from −18 dB to +5 dB when averaged over the 30-km source-receiver range. Whether using linear, triangular, or trapezoidal interpolation, or direct measurements of SSPs, no consistent change in model performance was observed. Increasing the numbers of intermediate SSPs in a series tended to reduce the modelled TL, regardless of interpolation type.

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Keywords
acoustics;transmission loss;sound speed profiles;propagation model;interpolation;Bellhop;ASPIRE
Report Number
DRDC-ATLANTIC-TM-2011-298 — Technical Memorandum
Date of publication
01 Jan 2014
Number of Pages
44
DSTKIM No
CA044498
CANDIS No
804918
Format(s):
Electronic Document(PDF)

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