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

By I.L. Kalikhman

Before, there has now not been any paintings that systematically offers the topic of acoustic fish reconnaissance, info all significant facets of utilizing acoustic gear in advertisement fish reconnaissance, and gives enough research of the effectiveness of fish-finding innovations. Acoustic Fish Reconnaissance responds to this want by way of offering the 1st assessment of the theoretical and functional facets of acoustic seek, detection, interpretation, and inhabitants estimation for advertisement benefit.This e-book can pay specific consciousness to the speculation and perform of accounting surveys for quantitative estimation of organic assets and fishing stipulations in conventional fishing components. It additionally analyzes a number of functions of acoustic method, established upon the authors' huge investigations. The textual content contains the result of the applicability of fish-finding tools, and gives tips on the advance of more advantageous acoustic strategies for advertisement fleets.

Show description

Read or Download Acoustic Fish Reconnaissance (Marine Science) PDF

Similar remote sensing & gis books

Make: Technology on Your Time

Should you prefer to tweak, disassemble, re-create, and invent cool new makes use of for know-how, you will love MAKE our quarterly e-book for the inquisitive do-it-yourselfer. each factor is choked with initiatives that will help you utilize the entire expertise on your lifestyles. every little thing from domestic leisure platforms, to laptops, to a bunch of PDAs is reasonable online game.

Machine Learning for Spatial Environmental Data: Theory, Applications, and Software (Environmental Sciences: Environmental Engineering)

This ebook discusses computing device studying algorithms, comparable to synthetic neural networks of other architectures, statistical studying concept, and help Vector Machines used for the category and mapping of spatially allotted data.  It provides easy geostatistical algorithms as well. The authors describe new tendencies in computing device studying and their software to spatial info.

Remote Sensing Digital Image Analysis: An Introduction

Distant Sensing electronic photograph research presents the non-specialist with an advent to quantitative evaluate of satellite tv for pc and airplane derived remotely retrieved info. because the first version of the e-book there were major advancements within the algorithms used for the processing and research of distant sensing imagery; however a number of the basics have considerably remained an analogous.

Radar hydrology : principles, models, and applications

Radar Hydrology: ideas, types, and functions presents graduate scholars, operational forecasters, and researchers with a theoretical framework and sensible wisdom of radar precipitation estimation. the one textual content out there exclusively dedicated to radar hydrology, this complete reference: starts with a short creation to radar specializes in the processing of radar information to reach at actual estimates of rainfall Addresses complex radar sensing ideas and functions Covers radar applied sciences for staring at each one component to the hydrologic cycle Examines state of the art hydrologic types and their inputs, parameters, nation variables, calibration methods, and outputs Discusses modern ways in information assimilation Concludes with tools, case experiences, and prediction method layout comprises downloadable MATLAB® content material Flooding is the number 1 weather-related normal catastrophe around the globe.

Additional info for Acoustic Fish Reconnaissance (Marine Science)

Example text

The point is that commercial schools are the major targets for a sonar search as well as for determining the aiming direction of fishing gears. fm Page 37 Wednesday, February 1, 2006 3:13 PM Scouting Characteristics of Acoustic Instruments 37 where α is the coefficient of spatial attenuation of the sound energy in water, dB/m; γ is the coefficient of axis concentration of the transducer; Pa is the acoustic power of insonification, W; and Imin is the minimal intensity of echo signals, received by the transducer, W/m2.

W. 4,5 According to the Rayleigh law, the average intensity of echo signals from a concentration is equal to the sum of intensities of elementary reflections from individual fish falling into an impulse volume. , to the density of the fish concentrations. fm Page 17 Thursday, February 2, 2006 10:29 AM Sound Scattering by Commercial Items 17 the Rayleigh regularities are disturbed, and fluctuations in echo signals become even higher. In this case, considerable fluctuations occur due to a nonuniform distribution of scatterers in the detection zone of the instrument.

To obtain an objective characteristic of the reflectivity of fish concentrations, it is expedient to use another parameter: the measure of the sound scattered by a unit volume of the concentration. 20) The volume backscatter is the function of only the physical characteristics of a concentration; namely, the fish reflectivity and the fish density. 20) show that the volume sound backscatter by fish concentrations can vary from 10–8 to 10–2 sp/m3. 20) is true only for concentrations of comparatively low density, which scatter sound according to the Rayleigh law.

Download PDF sample

Rated 4.93 of 5 – based on 20 votes