The effect of sediment layering on ocean bottom reflection loss

Authors

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

Keywords:

acoustic wave reflection, sediments, underwater sound, effect of sediment layering, ocean bottom reflection loss, turbidity currents, geographical location, contour currents, ice-rafting, core samples, centre frequency

Abstract

Various sets of bottom loss data from areas with turbidity currents indicate high acoustic reflectivity at a certain frequency band. The centre frequency of the band varies with geographical location. Different sedimentation processes affect the average speed of the sediments at a particular site and the vertical distribution of the layers. Turbidity currents, contour currents and ice-rafting all can create an alternation of layers of different impedances by the sediment-water interface. It was shown that core samples could potentially be used to estimate the centre frequency of the low bottom loss frequency band. Statistics of core properties of different areas with known sedimentation could improve the knowledge of bottom losses for remote areas

Published

1991-09-01

How to Cite

1.
Desharnais F. The effect of sediment layering on ocean bottom reflection loss. Canadian Acoustics [Internet]. 1991Sep.1 [cited 2021May10];19(4):73-4. Available from: https://jcaa.caa-aca.ca/index.php/jcaa/article/view/675

Issue

Section

Proceedings of the Acoustics Week in Canada