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IEEE Journal of Oceanic Engineering

Issue 2 • Date Apr 1990

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Displaying Results 1 - 9 of 9
  • Computer modeling and the design of optimal underwater imaging systems

    Publication Year: 1990, Page(s):101 - 111
    Cited by:  Papers (133)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1024 KB)

    A computer model to simulate the formation of underwater images has been developed. The model incorporates the inherent and apparent properties of the propagation of light in water. An image is approximated as a linear superposition of several image components. The model has been used to simulate the relative advantages of different camera/light configurations. The results indicate that extremely ... View full abstract»

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  • Laboratory investigation of nonlinear phenomena in wind-wave generation

    Publication Year: 1990, Page(s):130 - 132
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (272 KB)

    Wind-wave generation was investigated experimentally by seeding with mechanically generated waves. The nonlinear phenomena observed include initial quasi-coherent amplification, subsequent erratic lock-on behavior, and weak trends toward period and frequency doubling. The results indicate that synergetic wave-wind feedback is an important part of the growth mechanism View full abstract»

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  • Spectral spreading from surface bubble motion

    Publication Year: 1990, Page(s):95 - 100
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (476 KB)

    At low frequencies, surface bubbles contribute to acoustic backscattering in aggregate, and the motion of these bubble masses causes spectral spreading of the acoustic signals. This motion of the bubbles entrained in the surface waves is used to obtain the power spectrum of a low-frequency surface-scattered signal at a low grazing angle. A spectral distribution of the deterministic surface drift, ... View full abstract»

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  • CODAR wave measurements from a North Sea semisubmersible

    Publication Year: 1990, Page(s):119 - 125
    Cited by:  Papers (16)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (716 KB)

    CODAR, a high-frequency (HF) compact radar system, was operated continuously over several weeks aboard the semisubmersible oil platform Treasure Saga for the purpose of wave-height directional measurement and comparison. During North Sea winter storm conditions, the system operated at two different frequencies, depending on the sea state. Wave data are extracted from the second-order backscatter D... View full abstract»

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  • Simultaneous operation of the Sea Beam multibeam echo-sounder and the SeaMARC II bathymetric sidescan sonar system

    Publication Year: 1990, Page(s):84 - 94
    Cited by:  Papers (20)  |  Patents (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (2000 KB)

    An experiment aboard the Scripps Institution of Oceanography's RV Thomas Washington has demonstrated the seafloor mapping advantages to be derived from combining the high-resolution bathymetry of a multibeam echo-sounder with the sidescan acoustic imaging plus wide-swath bathymetry of a shallow-towed bathymetric sidescan sonar. To a void acoustic interference between the ship's 12-kHz Sea Beam mul... View full abstract»

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  • Fiber-optic data network for the ARGO/JASON vehicle system

    Publication Year: 1990, Page(s):66 - 71
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (684 KB)

    A description is given of the digital data network for the ARGO/JASON remotely operated vehicle system and its implementation over the system's 7000-m single-mode electrooptic cable. The implementation uses the ProNET terrestrial local area network hardware protocol to provide multinode communications and allows for transmission of the network data over one of several multiplexed channels. Standar... View full abstract»

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  • Real-time radar detection of iceberg shadows

    Publication Year: 1990, Page(s):112 - 118
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (956 KB)

    The Hough transform is used to estimate the radial direction of shadows cast by icebergs in surface-based marine radar returns using a Warp systolic computer. Automatically locating these shadows leads directly to automatically locating the icebergs casting the shadows. This is useful for the unattended navigation of a vessel through sea ice, as well as for improving the accuracy of a classified s... View full abstract»

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  • Signature extraction from mesoscale surface patterns observed on synthetic aperture radar imagery

    Publication Year: 1990, Page(s):126 - 130
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (608 KB)

    Two techniques for extracting internal wave signature from airborne synthetic aperture radar (SAR) imagery are presented. The first technique involves the extraction of a single-scan signature and appropriate for the validation of theoretical models which utilize sea truth from a limited area as input. The second technique involves creating a signature by averaging the results from a number of sin... View full abstract»

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  • Analysis of the formation and elimination of loops in twisted cable

    Publication Year: 1990, Page(s):72 - 83
    Cited by:  Papers (50)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (836 KB)

    Serious failures of ocean cable have resulted from the phenomenon known as hockling. When a cable is under tension, helical windings can cause the cable to twist. With relaxation of the tension, loops can form. Reapplication of tension tightens the loop, and at some point the loop in the cable may be eliminated or pop out. If it does not but hockles instead, serious damage will result. An analysis... View full abstract»

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Aims & Scope

The IEEE Journal of Oceanic Engineering (ISSN 0364-9059) is the online-only quarterly publication of the IEEE Oceanic Engineering Society (IEEE OES). The scope of the Journal is the field of interest of the IEEE OES, which encompasses all aspects of science, engineering, and technology that address research, development, and operations pertaining to all bodies of water. This includes the creation of new capabilities and technologies from concept design through prototypes, testing, and operational systems to sense, explore, understand, develop, use, and responsibly manage natural resources.

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Meet Our Editors

Editor-in-Chief
N. Ross Chapman
School of Earth & Ocean Sciences
University of Victoria
3800 Finnerty Road
Victoria, BC V8P 5C2 Canada
chapman@uvic.ca