The sensitivity of transmission loss modeling to environmental resolution – Emerald basin bathymetry and sediment composition

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Authors
  1. McCammon, D.F.
  2. Dosso, S.E.
  3. Morley, M.
  4. Giles, P.M.
  5. Brooke, G.H.
Corporate Authors
Defence R&D Canada - Atlantic, Dartmouth NS (CAN);Victoria Univ, Victoria BC (CAN) School of Earth and Ocean Sciences;General Dynamics Canada Ltd, Dartmouth NS (CAN)
Abstract
This report considers the effect of environmental sampling resolution on modeled transmission loss, for a nominal environment that is representative of parts of the Emerald Basin. The report presents the results of experiments on the effect of varying the bathymetry sampling interval in a range-dependent environment and with a complicated bathymetry profile, comparing transmission loss calculated for a finely-sampled bathymetry to transmission loss calculated with more coarsely sampled bathymetries. It also considers the effect of bottom sediment and bathymetry features, created to model typical environmental uncertainties in range-dependent environments. Finally the report considers the combined effect of sediment and bathymetry features in a range-dependent environment. For the environment in question, the study concludes that there may be little to be gained by measuring bathymetry at moderate resolutions (40-200 m), since the overall TL error is roughly constant at 7-10 dB over this range of resolutions. For range-dependent sediments, the TL error level is also roughly constant at a similar level for measurement intervals between 2000 and 9000 m. In order to achieve a significant improvement in the accuracy of the modeled TL, the sampling intervals must therefore get below these limits.

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Keywords
Environmental variability;Spatial sensitivity;Acoustic propagation modeling;Range dependent bottom
Report Number
DRDC-ATLANTIC-CR-2007-103 — Contractor Report
Date of publication
01 Aug 2007
Number of Pages
84
DSTKIM No
CA031937
CANDIS No
530904
Format(s):
CD ROM

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