Determining the extinction cross section of aggregating fish
Citable URI
https://hdl.handle.net/1912/5644As published
https://doi.org/10.1121/1.403682DOI
10.1121/1.403682Keyword
Sound waves; Cross sections; Extinction; Fishes; Fiords; Underwater; Acoustic monitoringAbstract
When fish are aggregated over a flat bottom, and fish and bottom echoes can be distinguished, it is possible to determine the fish extinction cross section by a simple application of the echo integration method. The theory for this is developed. Measurements at 38 kHz are presented for aggregations of the same 1983‐year class of herring over flat‐bottomed fjord areas in 1988, 1990, and 1991. The ratio of extinction and backscattering cross sections is found to lie in the approximate range from 1.2–2.3, depending on fish size and time of day.
Description
Author Posting. © Acoustical Society of America, 1992. This article is posted here by permission of Acoustical Society of America for personal use, not for redistribution. The definitive version was published in Journal of the Acoustical Society of America 91 (1992): 1983-1989, doi:10.1121/1.403682.
Collections
Suggested Citation
Journal of the Acoustical Society of America 91 (1992): 1983-1989Related items
Showing items related by title, author, creator and subject.
-
Discussion and illustration of problems suggested by the analysis of atmospheric cross-sections
(Massachusetts Institute of Technology and Woods Hole Oceanographic Institution, 1935-07)The preparation of atmospheric cross-sections, in which the fields of the various meteorological elements are represented in the vertical plane containing a number of synoptic aerological soundings, has long been a part ... -
Investigation of a marine magnetic polarity reversal boundary in cross section at the northern boundary of the Kane Megamullion, Mid-Atlantic Ridge, 23°40′N
(John Wiley & Sons, 2016-05-12)Near-bottom magnetic field measurements made by the submersible Nautile during the 1992 Kanaut Expedition define the cross-sectional geometry of magnetic polarity reversal boundaries and the vertical variation of crustal ... -
Microwave radar cross sections and Doppler velocities measured in the surf zone
(American Geophysical Union, 2005-12-23)The relationship between microwave imaging radar measurements of fluid velocities in the surf zone and shoaling, breaking, and broken waves is studied with field observations. Normalized radar cross section (NRCS) and ...
