SOUND PROPAGATION OVER AN ISOLATED SEAMOUNT OFF THE CANADIAN WEST COAST

Authors
  1. Ebbeson, G.R.
  2. Chapman, N.R.
Corporate Authors
Defence Research Establishment Pacific, Victoria BC (CAN)
Abstract
Acoustic shadowing, reflection, and enhancement near an isolated seamount have been studied by examining the results of an experiment carried out to measure the propagation loss over Dickins Seamount off the Canadian west coast. Two types of sound sources were used: a 230 Hz cw projector towed at depths of 18 and 184 m; and 0.82-kg explosives detonated at depths of 24 and 196 m. The receiving system had hydrophones spaced in depth from 329 to 633 m. In the acoustic shadow region, the propagation loss for the shallow sources increased by 15 dB over the loss measured in the absence of the seamount. Examination of the multipath propagation loss for the shots revealed that the received signals consisted of two arrivals. The first and dominant pulse was determined to be a diffracted wave while the subsequent group of weaker pulses was attributed to a series of bottom and surface reflections. TRUNCATED
Date of publication
01 Jan 1984
Number of Pages
15
DSTKIM No
85-00951
CANDIS No
45776
Format(s):
Hardcopy;Originator's fiche received by DSIS

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