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Hyrdoacoustic Ocean Exploration

Author: Iftikhar B. Abbasov
Publisher: John Wiley & Sons
ISBN: 1119323762
Size: 42.94 MB
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The only book that offers a comprehensive and fully up-to-date coverage of hydroacoustic ocean exploration, this work deals with the diagnostics of non-uniformities in a water medium using the hydroacoustic parametric antenna. The non-uniformities of the water medium in the study are of geometrically regular shape, i.e., the shape of a sphere, a cylinder, and a spheroid. An account is given of theoretical and experimental studies of wave processes that occur in the event of the scattering of non-linearly interacting acoustic waves at a sphere, a cylinder, and a spheroid. Scattering problems are formulated; solutions to the inhomogeneous wave equation are found in the first and second approximations using the successive approximations method. For the first time, high-frequency asymptotic expressions of acoustic pressure for all spectral components of the secondary field are obtained for the nonlinear scattering problem. The scattering diagrams are calculated and plotted, and then analyzed and compared. Results of experimental studies of the parametric acoustic antenna field scattering at solid steel spheres are presented. Experimental scattering diagrams both for the parametric antenna pump waves and for the secondary field waves including the difference frequency wave, the sum frequency wave, and the second harmonic wave are presented. 3D modeling of wave processes is also considered. A must have for researchers and specialists in nonlinear hydroacoustics and ocean acoustics; it also may be of use for postgraduates and students specializing in hydroacoustics and ocean exploration.

Exploration And Monitoring Of The Continental Shelf Underwater Environment

Author: Iftikhar B. Abbasov
Publisher: John Wiley & Sons
ISBN: 1119488281
Size: 76.48 MB
Format: PDF, Kindle
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There is still so much about the oceans that scientists do not know, and exploring the continental shelves of the world is a huge part of finding out more about these underwater environments. Further to that, it is extremely important that, while scientists and engineers explore and monitor the continental shelf, no damage is done to these precious environments. That is the needle that this study intends to thread, giving scientists and engineers a better method and processes for exploring these underwater mysteries, while protecting the environment and wildlife thriving beneath. Written by a proven scientist in this area, this book is dedicated to the unique developments of hydroacoustical equipment to monitor the coastal shelf. The results of the original experimental sonar studies with application of the parametric antenna are presented. The book presents a survey of the modern methods and technical monitoring facilities of the coastal aqueous environment. The basic characteristics of the parametric antennas are given considering propagation of the acoustic waves in the environments with dispersion and acoustical absorption. The author and his colleagues consider the questions of formation of the parametric antenna field in layered-heterogeneous media and the peculiarities of sounding of the interfaces and bottom sediments. Ecological monitoring methods of the basic parameters of quality and condition of the aqueous environment are analyzed. The peculiarities of diagnostics of the underwater engineering constructions when monitoring the offshore strips are described. For both veteran engineers and students in the field alike, this breakthrough study is a must-have for any scientific library concerned with studying the oceans and especially the continental shelf.

Underwater Technology

Author: Oceanic Engineering Society (U.S.)
Publisher: Institute of Electrical & Electronics Engineers(IEEE)
ISBN: 9780780342736
Size: 35.60 MB
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A primary goal of IEEE OES is to take its symposiums around the world, where emerging technology and applications can be synthesized into solutions for the future. "Key Issues for the Global Underwater Environment" provides a thematic umbrella under which the problems and potential long term solutions which concern not only the Pacific Rim countries, but the world in general are discussed.

Geostatistics For Estimating Fish Abundance

Author: J. Rivoirard
Publisher: John Wiley & Sons
ISBN: 0470756888
Size: 50.75 MB
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Geostatistics is a branch of spatial statistics that was originally developed for the mining industry. The technique is now widely recognised as an important tool for the estimation of the abundance and distribution of natural resources. However, new developments have been required to extend its application to fisheries science, particularly in variogram estimation. This important new title describes the fundamentals of geostatistics in terms more familiar to life-scientists, and uses case studies on seven commercially important fish stocks to demonstrate its application to fisheries survey data. Comprehensive and practical advice is given on how this new method can be used to estimate the abundance (with an appropriate measure of precision) of fish stocks worldwide. Geostatistics for Estimating Fish Abundance will be of vital interest to fisheries research scientists, marine biologists, oceanographers, marine and fish ecologists, environmental scientists and experts involved in the assessment of natural animal resources. The book has been developed as a result of studies carried out by a collaborative team of international researchers expert in this area with financial support from the Commission of the European Communities, AIR specific RTD programme. J. Rivoirard and N. Bez are at the Centre de Géostatistique de Fontainebleau, Ecole des Mines de Paris, France, J. Simmonds and P. Fernandes are at the FRS Marine Laboratory, Aberdeen, UK and K. Foote is at the Institute of Marine Research, Bergen, Norway and at Woods Hole Oceanographic Institution, USA.