Proceedings of the IEEE Fifth Working Conference on Current Measurement

7-9 Feb. 1995

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  • Proceedings of the IEEE Fifth Working Conference on Current Measurement

    Publication Year: 1995
    Request permission for commercial reuse | PDF file iconPDF (290 KB)
    Freely Available from IEEE
  • Author's index

    Publication Year: 1995
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    Freely Available from IEEE
  • Near-surface current meter array measurements of internal gravity waves

    Publication Year: 1995, Page(s):131 - 136
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1068 KB)

    A measurement capability using a horizontal array of 10 S4 current meters mounted on a stiff floating structure with 35 m aperture has been developed to support interpretation of radar imaging of surface effects associated with internal gravity waves. This system has been fielded three times and most recently, has collected data alongside the sea-surface footprint of a land-fixed radar imaging shi... View full abstract»

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  • The combined velocity-density-vorticity (VDV) sensor: a report on its first use

    Publication Year: 1995, Page(s):183 - 187
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (308 KB)

    the authors have developed a general-purpose sensor to measure several flow properties simultaneously. The instrument is very compact, simple to use, accurate, and cost-effective. VDV can measure 3-dimensional velocity, buoyancy flux and vorticity using advanced ultrasonics. The measurements are simultaneous and are sampled in the same volume of water. This guarantees very high correlation between... View full abstract»

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  • Data acquisition instrumentation for the study of tidal flat and estuarine physics

    Publication Year: 1995, Page(s):241 - 245
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (344 KB)

    Tides, wind-driven currents, and wind waves all contribute to the complex morphologies of estuaries and embayments, and exert in particular a controlling influence on the morphology of tidal flats. A new research tool (STAR: sediment transport autonomous recorder) has been designed primarily to study the dynamics of tidal flats and estuarine circulation/sediment transport. The new, low-profile ins... View full abstract»

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  • Networking multiple HF radar systems with common coverage overlap

    Publication Year: 1995, Page(s):127 - 130
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (944 KB)

    Two older NOAA pulse-Doppler CODAR systems at Moss Landing and Monterey, CA have been providing real-time surface-current map coverage of Monterey Bay since 1992. In July 1994, this configuration was extended. The older CODAR at Monterey has been replaced by a new lower frequency, longer-range SeaSonde. SeaSondes have been brought on line at Santa Cruz and Granite Canyon, South of Monterey. This p... View full abstract»

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  • Low cost link for acoustic telemetry

    Publication Year: 1995, Page(s):211 - 215
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (288 KB)

    During the past decade, the capabilities of marine research data acquisition instrumentation have dramatically improved. The need to have access to this data on a real-time basis has also intensified, spawning a number of acoustic telemetry development programs. However, reliable, high-speed, acoustic communications from seafloor instrumentation to shore facilities has been slow to develop, primar... View full abstract»

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  • Surface current measurement network using cellular telephone telemetry

    Publication Year: 1995, Page(s):177 - 180
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (324 KB)

    An array of five near-surface current measuring buoys has been designed and deployed in the Gulf of Mexico. Each buoy is networked with a central shore station via commercial cellular telephone service. Each buoy employs an electromagnetic water flow sensor (2 meter depth) and a vector-averaging data acquisition system to collect and record near-surface current data. Buffered data are automaticall... View full abstract»

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  • Wavelet transform analyses of non-stationary tidal currents

    Publication Year: 1995, Page(s):100 - 105
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (596 KB)

    The focus of this paper is on the use of wavelet transform analyses to extract time-varying tidal signals from current meter data. The properties of wavelet analyses are contrasted with those of traditional techniques of tidal analysis and other methods that may be used to study non-stationary signals. Wavelets are more flexible than other techniques in the vital tradeoff between time resolution a... View full abstract»

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  • VHF radar measurements of flow patterns in bays and estuaries

    Publication Year: 1995, Page(s):143 - 147
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (340 KB)

    In late April through early May 1994, the University of Miami Ocean Surface Current Radar (OSCR) system was deployed to measure currents over a portion of Biscayne Bay, FL. The purpose of this exploratory deployment of the OSCR system was to evaluate its capability to map currents in an environment having low amplitude Bragg resonant waves and containing numerous shoals and small islands. The resu... View full abstract»

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  • Moored current meter data at BBL dynamic structure studies of the North-West Africa shelf and continental slope

    Publication Year: 1995, Page(s):251 - 254
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (308 KB)

    Moored data collected by means of current meters on the shelf and continental slope of NW Africa have been utilized to reveal peculiarities of meso- and smallscale dynamic structure of the bottom boundary layer (BBL). Clear upwelling features in the bottom currents on the shelf in the time domain were found out and were shown to be due to the wind action and the Ekman transport in the surface laye... View full abstract»

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  • A new technique for detailed acoustic current profiles in the continental shelf wave bottom boundary layer

    Publication Year: 1995, Page(s):220 - 225
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (668 KB)

    High bottom stress levels in the continental shelf wave bottom boundary layer make it of great importance in the study of sediment entrainment and transport. Existing instruments capable of making measurements in the wave boundary layer cannot resolve its full dynamic behavior because they are restricted to single measurement volumes. An acoustic current meter with multiple sample volumes in a geo... View full abstract»

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  • Observations of tidal and wind-driven currents, and acoustic backscatter using an acoustic Doppler current profiler on a surface-following buoy

    Publication Year: 1995, Page(s):233 - 240
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (712 KB)

    The near-surface oceanic boundary layer is a challenging environment for current measurements: there are the practical difficulties of making measurements, and often the interpretation of the results is not straightforward. Acoustic Doppler current profilers (ADCPs) can contribute to easing both of these difficulties, but are not without their own set of problems. The authors have developed a surf... View full abstract»

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  • Extending and expanding the life of older current meters

    Publication Year: 1995, Page(s):5 - 9
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (368 KB)

    The EG&G Model 610 VACM and Model 630 VMCM are standards for ocean current measurements. It is simple to add peripheral sensors to the data stream of the VACM by use of add-on CMOS circuitry. The firmware control of the VMCM makes it virtually impossible to add sampling of additional sensors. Most of the electronic components used in the VACM are obsolete or difficult to replace and the VMCM w... View full abstract»

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  • Advances in Doppler sonar technology

    Publication Year: 1995, Page(s):37 - 41
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (888 KB)

    There has been significant recent progress in the development of Doppler sonar systems for marine research. Major advances include the development of side-scan Doppler systems for surface wave, ship wake and Langmuir cell research, the development of coded pulses for improved sonar precision, and the development of phased array Doppler sonar for 3D (x,y,t) imaging of flow fields. Major challenges ... View full abstract»

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  • Measurement of net flow through a channel

    Publication Year: 1995, Page(s):121 - 126
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (548 KB)

    The flow through the North Channel of the Irish Sea has been measured from summer 1993 to autumn 1994 by a surface current HF radar system, which covered the width of the channel, and a broadband 150 kHz ADCP. The ADCP was deployed in a low profile sea bed frame. Its transducers pointed at 20° to the vertical; currents were recorded in 5 m cells from 12.5 m above the sea bed to 15 m below the ... View full abstract»

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  • Direct measurements of Reynolds stress with an acoustic Doppler velocimeter

    Publication Year: 1995, Page(s):205 - 210
    Cited by:  Papers (10)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (564 KB)

    Ocean boundary layer dynamics is dominated by high-frequency, intermittent phenomena that can only be described in detail using turbulent statistics. Unfortunately, direct measurements of bulk turbulent parameters (kinetic energy, dissipation rates, Reynolds stress, etc.) have proven elusive because precise estimates require current meters that can measure all three velocity components, have a goo... View full abstract»

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  • The development and application of GPS drifter for ocean current measurement

    Publication Year: 1995, Page(s):169 - 176
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (544 KB)

    A radio system to transmit data of the Global Positioning System (GPS) was applied to observe ocean currents. The platform has been designed and tested with success. Ideally, the control system at a base station can simultaneously monitor any number of drifters to measure current at a depth from just beneath the surface to dozens of meters. Horizontally, a land base at 100 m altitude can monitor o... View full abstract»

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  • Barotropic flows observed by the towed transport meter

    Publication Year: 1995, Page(s):24 - 29
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (468 KB)

    The structure of the meridional transport east of Abaco, the Bahamas, was simultaneously observed with moored current meters and a towed electric field sensor. Important currents in this region include the northward flowing Antilles Current near the surface and the Deep Western Boundary Current flowing southward at depth. The towed measurements of vertically averaged velocity were obtained with th... View full abstract»

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  • Wind direction from an upward looking ADCP

    Publication Year: 1995, Page(s):95 - 99
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (364 KB)

    Considers velocity estimates of the near-surface ocean from upward looking ADCPs. The authors believe that the acoustic targets that provide this velocity signal are subsurface bubbles generated by wave breaking. The near surface current is a combination of both regional currents and local wind generated currents. The authors present a method isolating the local wind drift current to provide An es... View full abstract»

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  • Surface currents within and offshore of Monterey Bay as mapped by a multiple-site HF radar (CODAR) network

    Publication Year: 1995, Page(s):137 - 142
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (540 KB)

    Near surface two-dimensional current observations are presented from a network of HF radar systems around the shores of Monterey Bay, California. Data from two SeaSonde systems and one CODAR system is described for the period August through October, 1994. (Each of these radar systems uses direction finding techniques to steer the observations based on radar returns on three co-located antennae). R... View full abstract»

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  • Open water test of the SonTek acoustic Doppler velocimeter

    Publication Year: 1995, Page(s):188 - 192
    Cited by:  Papers (6)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (368 KB)

    In June of 1994, the SonTek acoustic Doppler velocimeter (ADV) was deployed for two days from the dock at the Woods Hole Oceanographic Institution and for one day from the R/V Asterias in Buzzards Bay. The ADV was hung at a depth of approximately 2 meters below the surface. A vector averaging current meter (VMCM), used as a standard, was deployed along side. The ADV had a signal to noise of 18 to ... View full abstract»

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  • Deep sea current measurement with 3-D Sing-around acoustic Doppler current meter

    Publication Year: 1995, Page(s):246 - 250
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (376 KB)

    A deep sea floor (about 1960 m) in the Suruga Trough that is located 150 km away to south-east of Tokyo, Japan, is known to have a distribution of current ripples. It implies that there is strong current and bottom sediment transportation near the floor. In 1990, the authors measured current velocity in the bottom layer using a mooring system with a 3D Sing-around acoustic Doppler current meter, a... View full abstract»

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  • Linearity and noise in differential travel time acoustic velocity measurement

    Publication Year: 1995, Page(s):216 - 219
    Cited by:  Papers (6)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (320 KB)

    An improved constant current source for the time interval integrator in the differential travel time velocity sensor, BASS (Benthic Acoustic Stress Sensor), has extended the full scale range of velocity over which the measurement of velocity is linear from 100 cm/s to 500 cm/s1. Slow speed response in the former constant current source introduced non-linearities of 5% to 8% for full sca... View full abstract»

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  • Measurements of upper-ocean surface currents with high-frequency radar

    Publication Year: 1995, Page(s):109 - 114
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (340 KB)

    High-frequency (HF) radar measurements of ocean surface currents offer a convenient means of measuring not only the surface current, but its vertical shear within the uppermost two meters of the ocean. HF radar measurements made off the central California coast reveal a clockwise rotation of the current vector as a function of increasing depth even within the uppermost meter of water. Comparisons ... View full abstract»

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