Bottom loss in areas with ice-rafted sediments

Authors

  • F. Desharnais Defence Res. Establ. Atlantic, Dartmouth, NS, Canada

Keywords:

oceanographic regions, sea ice, sediments, underwater sound, turbidity currents, sound propagation, Arctic seas, grazing angle data, Baffin Bay, bottom losses, ice-rafted sediments, high-impedance material, North Atlantic Ocean, sediment configuration, thin layer approximation, 20 to 630 Hz, 0 to 3500 m

Abstract

Bottom loss vs. grazing angle data was obtained for a location in Baffin Bay. The analysis showed bottom losses decreasing with frequency, for frequencies from 20 to 630 Hz. This feature fits the hypothesis of the presence of ice-rafted sediments, which could be modelled by adding a thin layer of high-impedance material at the sediment surface. Other areas of the North Atlantic Ocean have shown similar features in their bottom loss curves and sediment configuration. The thin layer approximation appears to be valid for areas where ice-rafting is dominant. Turbidity currents may possibly create the same phenomenon

Published

1991-12-01

How to Cite

1.
Desharnais F. Bottom loss in areas with ice-rafted sediments. Canadian Acoustics [Internet]. 1991Dec.1 [cited 2021Jun.17];19(5):11-5. Available from: https://jcaa.caa-aca.ca/index.php/jcaa/article/view/700

Issue

Section

Technical Articles