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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
    Request permission for commercial reuse | PDF file iconPDF (58 KB)
    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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  • 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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  • 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 The older CODAR at Monterey has been replaced by a new lower frequency, longer-range SeaSonde.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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  • 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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  • Deep water current profile measurements for operational support and design statistics

    Publication Year: 1995, Page(s):90 - 94
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (416 KB)

    Describes the use of acoustic Doppler current profilers (ADCP) to provide real-time current profile information for drilling vessels operating in deep water and also discusses the quality control and post-processing of associated recorded data to provide design current statistics. Experience gained from many such deployments over the last seven years is drawn upon to make specific recommendations ... 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 (8)
    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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  • 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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  • Measurement of net flow through a channel

    Publication Year: 1995, Page(s):121 - 126
    Cited by:  Papers (2)
    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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  • 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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  • Shelf sea current profile measurements from the sea surface to the sea bed in autumn

    Publication Year: 1995, Page(s):83 - 89
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (580 KB)

    Current profile measurements were obtained during the autumnal breakdown of stratification at a site in the northern North Sea where the tidal currents were weak and the water depth moderate (120 m). During the two month deployment period a succession of storms passed over the site, including one extreme event. An ADCP in a sea bed frame, a conventional current meter string and some near surface c... View full abstract»

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  • Acoustic current meter for sounding and position instruments

    Publication Year: 1995, Page(s):229 - 232
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (260 KB)

    The theoretical preconditions for creation of a new acoustic component current meter with wide direction diagram and minimum influence of constructive elements on measurement results are considered. The influence of technological errors on opportunities to transmit the hydroacoustic signals in the sensor are analysed. The data about practical realizations of acoustic component current meter and re... View full abstract»

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  • Moored internal wave measurements near Mascarene ridge using “POTOK” current meters

    Publication Year: 1995, Page(s):265 - 268
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (232 KB)

    Tidal internal wave generation over the Mascarene underwater ridge was studied by means of moored current and temperature meters measurements and tested by three mathematical models. The wave parameters amplitudes and energy fluxes were obtained. The measurements were compared with model results. The accordance was satisfactory 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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  • Single beam, high resolution pulse-to-pulse coherent Doppler profiler

    Publication Year: 1995, Page(s):199 - 204
    Cited by:  Papers (6)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (520 KB)

    Reports on the development of a single beam, 1.7 MHz coherent Doppler sonar. The system is PC-controlled, using a digital signal processor (DSP) to acquire and extract the velocity and backscatter amplitude data. Results from a series of tow tank calibration tests demonstrate an accuracy in the order of 5 mm s-1, for data rates of 10 profiles/second in 75, 1.5 cm range bins. The authors... 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 (1)
    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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  • 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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  • Advances in autonomous GPS Lagrangian buoys

    Publication Year: 1995, Page(s):157 - 162
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (636 KB)

    Drifting buoys with onboard position receivers have provided valuable Lagrangian current data since their introduction in the mid-1980s. Current autonomous buoys with Global Positioning System (GPS) receivers provide data with quality and quantity unobtainable with ARGOS-only positioning. Advances in hardware, software, and pricing are rapidly broadening the range of applications for these buoys. ... View full abstract»

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  • Mapping surface currents near the Gulf Stream using the Air Force over-the-horizon-radar

    Publication Year: 1995, Page(s):115 - 120
    Cited by:  Papers (5)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (312 KB)

    During nine days in 1993 and 1994, the authors pointed the Air Force OTH-B radar in Maine southward to illuminate a 240,000 km2 ocean area off the Carolina coast to test the feasibility of mapping radial surface currents. In the past, ionospheric motions have masked the effects of ocean currents on the OTH sea echo spectrum. The present authors average the radar measurements over time ... 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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  • Experiences with vessel borne ADCPs in shallow waters

    Publication Year: 1995, Page(s):79 - 82
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (304 KB)

    Two ADCPs-narrow- and broadband-were used aboard different ships to measure fluxes through estuarine inlets. Water bias affecting the ship's velocity vector as obtained from bottom tracking necessitated the use of navigation systems when acoustically soft ground, layered by suspended sediment, was encountered. The alignment between the ADCP's direction and the gyro compass heading poses the same p... View full abstract»

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  • The Nordic WOCE travel-resistant ADCP system

    Publication Year: 1995, Page(s):15 - 18
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (496 KB)

    In the Nordic WOCE programme 10 Acoustic Doppler Current Profilers (ADCPs) will be deployed between Greenland and Scotland. Three of these deployments will be in very heavily fished areas, and a special system has been developed to reduce the risk of interaction between the rig and fishing gear. The system consists of a buoyant instrument package and a protecting platform which will remain on the ... View full abstract»

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  • Use of ADCP and S4 current meters at high sampling rates in stratified Scottish coastal waters

    Publication Year: 1995, Page(s):65 - 70
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (508 KB)

    Sea-water in the Sound of Sleat is stratified in summer. The authors measured currents in the 20 metres of the water closest to the surface with an RDI acoustic Doppler current profiler (ADCP: 1200 kHz) and a vertical moored string of InterOcean electromagnetic S4 current meters in light winds for about 100 hours in summer 1992. The frequency of averaged measurement was every minute. Comparison of... View full abstract»

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