Download or read book Development of Mid Frequency Multibeam Sonar for Fisheries Applications written by and published by . This book was released on 2007 with total page 7 pages. Available in PDF, EPUB and Kindle. Book excerpt: The long-term goal of this program is to investigate the utility of mid-frequency (~10 kHz) acoustics to detect, enumerate, and identify pelagic fish distributions. Objectives of this research include: comparisons of fish backscatter models, models of mid-frequency sound propagation, development of a mid-frequency multibeam sonar, and backscatter measurements using split-beam echo sounders and the multibeam sonar.
Download or read book Applications of Multibeam Sonar Surveys in the U S Army Corps of Engineers written by and published by . This book was released on 1996 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Multibeam sonars are shallow water instruments that provide full bottom coverage and are ideal for the inland waters and river operations covered by the U.S. Army Corps of Engineers (USACE). Recent advances in multibeam echo sounding coupled with increasing computing capabilities have led this agency to achieve higher efficiencies in performing its hydrographic surveying mission, The high resolution and accuracy of multibeam survey systems have enabled them to be used for dredge payment surveys in channel deepening operations where highly accurate digital terrain models (DTMs) are needed. Environments for hydrographic surveying range from muddy, low slope rivers with high concentrations of suspended particulate matter and very soft bottoms, to dynamic coastal areas and estuaries with rapidly changing water characteristics. These conditions will dictate which sonar frequency and swath width is best suited for a particular location. Included in this paper are examples from the Mississippi River area, Houston-Galveston Ship Channel, Panama Canal, and California. This wide range of conditions has justified the need for development of a low frequency multibeam transducer that will penetrate the unconsolidated sediments found in many rivers in the southeastern United States.
Download or read book Volumetric Multibeam Sonar Measurements of Fish Zooplankton and Turbulence written by and published by . This book was released on 2005 with total page 8 pages. Available in PDF, EPUB and Kindle. Book excerpt: This paper focusses on an evaluation of the mid-water survey capability of a high-resolution multi-beam sonar conducted as part of an investigation of zooplankton aggregations in Knight Inlet, British Columbia. The work included simultaneous measurements with a conventional, three-frequency calibrated echo sounder system. The multi-beam sonar, adapted from a standard bathymetric system, operated at 455 kilohertz and provided 240 half-degree beams in the across-track plane with a one-degree along-track beam angle. The results demonstrate the ability of the multi-beam sonar to provide mid-water images of fish schools, crustacean zooplankton, and near-surface turbulent micro-structure features. Close comparisons with the echo sounders confirmed the multi-beam calibrations, allowing assessment of the multi-beam volumetric sampling capabilities.
Download or read book Research Required to Understand the Impact of Tactical Mid frequency Sonar Transmission on Fish Fisheries and Fisheries Habitat written by and published by . This book was released on 2007 with total page 16 pages. Available in PDF, EPUB and Kindle. Book excerpt: As reported in NPS-OC-07-004, analysis of public comments responding to the Draft Environmental Impact Statement (October 2005) for the proposed Undersea Warfare Training Range (USWTR) in Onslow Bay off North Carolina identified three main areas of public concern. One of these concerns, the effects on fish and fisheries habitats of mid-frequency active (MFA) sonar, further identified four sub-areas of concern: catch rates, spawning choruses, distribution and migratory behavior, and physiological effects. A workshop was held in April 2007 at Duke University to address these sub-areas of concern. The purpose of the workshop was to outline a program of research that could help determine how MFA sonar might affect fish and fisheries resources. This report summarizes the recommendations that emerged from that workshop. Specifically, a long-term research and development plan is articulated, as well as the priorities within that plan.
Download or read book Understanding Surveillance Technologies written by J.K. Petersen and published by CRC Press. This book was released on 2007-02-05 with total page 1021 pages. Available in PDF, EPUB and Kindle. Book excerpt: Understanding Surveillance Technologies demystifies spy devices and describes how technology is used to observe and record intimate details of people‘s lives often without their knowledge or consent. From historical origins to current applications, it explains how satellites, pinhole cameras, cell phone and credit card logs, DNA kits, tiny m
Download or read book Non linear Processing to Remove Multi beam Sonar Artifacts written by and published by . This book was released on 2002 with total page 29 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Department of Fisheries & Oceans has been analyzing the theoretical & real-world performance of circular array based multi-beam sonars with the objective of both quantitative & qualitative fisheries applications. This report presents a preliminary study of the properties & mechanism of one signal processing algorithm that appears to both enhance sonar angular resolution and strongly reject unwanted reverberation noise. The elementary properties of this simple non-linear technique for acoustic array beamforming, originally developed for enhanced seismic exploration but adapted to multi-beam sonar, are explored using both theory and numerical simulation. Application to fisheries field data illustrates the potential of the technique compared to conventional linear beamforming.
Download or read book Fisheries Acoustics written by D.N. MacLennan and published by Springer Science & Business Media. This book was released on 2013-04-17 with total page 341 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Investigating the Application of Multibeam Sonar and Remotely Operated Vehicles in Fish Population Monitoring on Artificial Reefs written by Robert Figueroa-Downing and published by . This book was released on 2017 with total page 76 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Journal of the Acoustical Society of America written by Acoustical Society of America and published by . This book was released on 2005 with total page 1064 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Oceans 04 MTS IEEE written by and published by Institute of Electrical & Electronics Engineers(IEEE). This book was released on 2004 with total page 654 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Novel Acoustic Techniques for Assessing Fish Schooling in the Context of an Operational Ocean Observatory written by and published by . This book was released on 2009 with total page 14 pages. Available in PDF, EPUB and Kindle. Book excerpt: The goal of this work is to develop new methods for observing large spatial scales in oceanic ecosystems. In particular, this report focuses on the development and use of a new type of mid-frequency, multi-beam sonar for making long-range backscatter images of fish aggregations in shallow water with the aid of the ocean acoustic waveguide. Fish aggregation is important during spawning, predation, and feeding, yet the quantitative analyses of gregarious movements and behaviors remain relatively rare. Measurements of fish aggregations are often difficult, particularly in pelagic environments. In terms of the forward sonar problem, widespread fish aggregations will appear as interfering reverberation, while schools and shoals may appear as false targets or may screen other targets, degrading sonar system performance.
Download or read book Submarine Geomorphology written by Aaron Micallef and published by Springer. This book was released on 2017-07-18 with total page 554 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book on the current state of knowledge of submarine geomorphology aims to achieve the goals of the Submarine Geomorphology working group, set up in 2013, by establishing submarine geomorphology as a field of research, disseminating its concepts and techniques among earth scientists and professionals, and encouraging students to develop their skills and knowledge in this field. Editors have invited 30 experts from around the world to contribute chapters to this book, which is divided into 4 sections – (i) Introduction & history, (ii) Data & methods, (ii) Submarine landforms & processes and (iv) Conclusions & future directions. Each chapter provides a review of a topic, establishes the state-of-the-art, identifies the key research questions that need to be addressed, and delineates a strategy on how to achieve this. Submarine geomorphology is a priority for many research institutions, government authorities and industries globally. The book is useful for undergraduate and graduate students, and professionals with limited training in this field.
Download or read book Oceanography in 2025 written by National Research Council and published by National Academies Press. This book was released on 2009-05-04 with total page 199 pages. Available in PDF, EPUB and Kindle. Book excerpt: On January 8 and 9, 2009, the Ocean Studies Board of the National Research Council, in response to a request from the Office of Naval Research, hosted the "Oceanography in 2025" workshop. The goal of the workshop was to bring together scientists, engineers, and technologists to explore future directions in oceanography, with an emphasis on physical processes. The focus centered on research and technology needs, trends, and barriers that may impact the field of oceanography over the next 16 years, and highlighted specific areas of interest: submesoscale processes, air-sea interactions, basic and applied research, instrumentation and vehicles, ocean infrastructure, and education. To guide the white papers and drive discussions, four questions were posed to participants: What research questions could be answered? What will remain unanswered? What new technologies could be developed? How will research be conducted?
Download or read book Shark Research written by Jeffrey C Carrier and published by CRC Press. This book was released on 2018-09-03 with total page 408 pages. Available in PDF, EPUB and Kindle. Book excerpt: Over the last decade, the study of shark biology has benefited from the development, refinement, and rapid expansion of novel techniques and advances in technology. These have given new insight into the fields of shark genetics, feeding, foraging, bioenergetics, imaging, age and growth, movement, migration, habitat preference, and habitat use. This pioneering book, written by experts in shark biology, examines technologies such as autonomous vehicle tracking, underwater video approaches, molecular genetics techniques, and accelerometry, among many others. Each detailed chapter offers new insights and promises for future studies of elasmobranch biology, provides an overview of appropriate uses of each technique, and can be readily extended to other aquatic fish and marine mammals and reptiles. Including chapter authors who were pioneers in developing some of the technologies discussed in the book, this book serves as the first single-source reference with in-depth coverage of techniques appropriate for the laboratory and field study of sharks, skates, and rays. It concludes with a unique section on Citizen Science and its application to studies of shark biology. This is a must-read for any marine biologist or scientist working in the field of shark biology, as well as marine biology students and graduates.
Download or read book Fundamentals of Acoustical Oceanography written by Herman Medwin and published by Academic Press. This book was released on 1997-11-05 with total page 739 pages. Available in PDF, EPUB and Kindle. Book excerpt: The developments in the field of ocean acoustics over recent years make this book an important reference for specialists in acoustics, oceanography, marine biology, and related fields. Fundamentals of Acoustical Oceanography also encourages a new generation of scientists, engineers, and entrepreneurs to apply the modern methods of acoustical physics to probe the unknown sea. The book is an authoritative, modern text with examples and exercises. It contains techniques to solve the direct problems, solutions of inverse problems, and an extensive bibliography from the earliest use of sound in the sea to present references.Written by internationally recognized scientists, the book provides background to measure ocean parameters and processes, find life and objects in the sea, communicate underwater, and survey the boundaries of the sea. Fundamentals of Acoustical Oceanography explains principles of underwater sound propagation, and describes how both actively probing sonars and passively listening hydrophones can reveal what the eye cannot see over vast ranges of the turbid ocean. This book demonstrates how to use acoustical remote sensing, variations in sound transmission, in situ acoustical measurements, and computer and laboratory models to identify the physical and biological parameters and processes in the sea.* Offers an integrated, modern approach to passive and active underwater acoustics* Contains many examples of laboratory scale models of ocean-acoustic environments, as well as descriptions of experiments at sea* Covers remote sensing of marine life and the seafloor* Includes signal processing of ocean sounds, physical and biological noises at sea, and inversions* resents sound sources, receivers, and calibration* Explains high intensities; explosive waves, parametric sources, cavitation, shock waves, and streaming* Covers microbubbles from breaking waves, rainfall, dispersion, and attenuation* Describes sound propagation along ray paths and caustics* Presents sound transmissions and normal mode methods in ocean waveguides
Download or read book Atlas of Submarine Glacial Landforms written by J.A. Dowdeswell and published by Geological Society of London. This book was released on 2016-12-16 with total page 631 pages. Available in PDF, EPUB and Kindle. Book excerpt: New geophysical techniques (multibeam echo sounding and 3D seismics) have revolutionized high-resolution imaging of the modern seafloor and palaeo-shelf surfaces in Arctic and Antarctic waters, generating vast quantities of data and novel insights into sedimentary architecture and past environmental conditions. The Atlas of Submarine Glacial Landforms is a comprehensive and timely summary of the current state of knowledge of these high-latitude glacier-influenced systems. The Atlas presents over 180 contributions describing, illustrating and discussing the full variability of landforms found on the high-latitude glacier-influenced seafloor, from fjords and continental shelves to the continental slope, rise and deep-sea basins beyond. The distribution and geometry of these submarine landforms provide key information on past ice-sheet extent and the direction and nature of ice flow and dynamics. The papers discuss individual seafloor landforms, landform assemblages and entire landsystems from relatively mild to extreme glacimarine climatic settings and on timescales from the modern margins of tidewater glaciers, through Quaternary examples to ancient glaciations in the Late Ordovician.
Download or read book Handbook of Seafloor Sonar Imagery written by Philippe Blondel and published by . This book was released on 1997-05-30 with total page 352 pages. Available in PDF, EPUB and Kindle. Book excerpt: Most of the ocean floor remains unmapped but with the introduction of acoustic remote sensing and deep submersible dives this is now achievable. The major use of this book is interpretation of sonar images through worked examples.
