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Download Acoustic Fish Reconnaissance (Marine Science) by I.L. Kalikhman PDF

By I.L. Kalikhman

Formerly, there has now not been any paintings that systematically offers the topic of acoustic fish reconnaissance, info all significant features of employing acoustic gear in advertisement fish reconnaissance, and gives enough research of the effectiveness of fish-finding strategies. Acoustic Fish Reconnaissance responds to this desire by means of supplying the 1st review of the theoretical and functional facets of acoustic seek, detection, interpretation, and inhabitants estimation for advertisement benefit.This publication can pay specific awareness to the speculation and perform of accounting surveys for quantitative estimation of organic assets and fishing stipulations in conventional fishing parts. It additionally analyzes a variety of purposes of acoustic procedure, dependent upon the authors' large investigations. The textual content comprises the result of the applicability of fish-finding tools, and gives tips about the advance of more desirable acoustic ideas for advertisement fleets.

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Additional resources for Acoustic Fish Reconnaissance (Marine Science)

Example text

Or sonar with a long impulse, the contribution of the reflection coherency noticeably decreases. In the above-mentioned discussion, we did not take into consideration the effect of sound scattering by the heterogeneities of the sea. However, various organic and nonorganic inclusions occurring in the sea as well as heterogeneities occurring in the microstructure of the water may give rise to additional fluctuations of echo signals and decrease the influence of the reflection coherency. Taking this into account, the above preliminary estimation of coherent scattering must be verified and defined more precisely by experiments.

The establishment of the dependence of echo signal intensity on the degree of concentration in dense schools of marine items requires further theoretical and experimental investigations. 4 CLASSIFICATION OF ECHO SIGNALS FROM COMMERCIAL ITEMS Echo signal intensities, the degree of their fluctuations, as well as the character of representing concentrations when registered by acoustic instruments depends to a great extent upon the number of commercial items in an impulse volume. 28) where Vimp is an impulse volume.

Fluctuations of such coherent echo signals are usually not great. Let us try to make a quantitative estimation of the sound backscattering by fish concentrations of different density. As to the acoustic section, it can be easily determined in the Rayleigh scattering where the average intensity of echo signals is proportional to the number of items in an impulse volume. THE RAYLEIGH SCATTERING OF SOUND The simplest way of estimating the energy scattered by a concentration is with the Rayleigh law of scattering, when the average intensity of echo signals is proportional to the quantity of insonified items.

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