Proceedings of the IEEE Fifth Working Conference on Current Measurement

7-9 Feb. 1995

Filter Results

Displaying Results 1 - 25 of 48
  • 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
  • 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»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • 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»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Barotropic ocean velocity observations from an electric field float, a modified RAFOS float

    Publication Year: 1995, Page(s):163 - 168
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (424 KB)

    A seldom observed characteristic of ocean motion is depth-averaged velocity, or transport per unit width. One approach to observing this quantity is to measure the ambient horizontal electric field of the ocean with electric field sensors added to a RAFOS float. The Electric Field Float (EFF) is a RAFOS float modified by the addition of a compass, electrode arms, amplifiers, and a microprocessor. ... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • 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»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • 38 kHz broadband phased array acoustic Doppler current profiler

    Publication Year: 1995, Page(s):53 - 57
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (424 KB)

    Recently RD Instruments (RDI) finished developing and demonstrating the performance of a prototype 38 kHz broadband phased array acoustic Doppler current profiler (ADCP) for deep ocean current measurement. Unlike conventional RDI ADCPs with four circular transducers, the prototype uses one flat face broadband phased array which is about the same size of one circular transducer in the conventional ... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • 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»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • 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»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • The determination of slippage of drifters and the leeway of search and rescue targets using InterOcean S4 EMCM

    Publication Year: 1995, Page(s):151 - 156
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (444 KB)

    The U.S. Coast Guard Research and Development Center, Improvement of Search and Rescue Capabilities Project has conducted studies of the motion of Lagrangian drifters and search and rescue (SAR) targets relative to the water. This slippage was measured using InterOcean S4 electromagnetic current meters (EMCM), and related to measured winds. The slippage of a FGGE Hull drifter (12 days of slippage ... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Performance of an acoustic Doppler current estimation method based on the Symmiktos method

    Publication Year: 1995, Page(s):47 - 52
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (452 KB)

    The estimation of water current by using acoustic Doppler current meters is a well-known method. Determination of the water current is based on the Doppler shift caused by the movement of small particles in the water, and related to the current as an average. These movements cause a Doppler shift with an assumed Gaussian-shaped distribution in time. Due to scattering from many different bubble siz... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • 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»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • 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»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • 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»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • 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»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • 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»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • 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»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • 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»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Aanderaa DCM 12 Doppler current meter performance characteristics

    Publication Year: 1995, Page(s):43 - 46
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (332 KB)

    Field test were performed on a new Aanderaa DCM 12 Doppler current meter by comparing its performance with an RD Instruments 1200 kHz acoustic Doppler current profiler (ADCP). Aanderaa instruments provided the DCM 12 and furnished support to assure that the DCM 12 was deployed and operated properly. The comparison site selected was the Old Port Tampa ADCP station of the Tampa Bay Physical Oceanogr... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • 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»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Vertical profiling of the bottom boundary layer

    Publication Year: 1995, Page(s):255 - 258
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (284 KB)

    Hydrophysical complex OLT-D is created in MHI for vertical profiling of the bottom boundary layer. The instrument provides the measurement of vertical current, temperature, electrical conductivity, salinity, density profiles at completion sounding from the vessel. The system of processing the dates about space instrument and cable situation is used for definition of sensors movement relatively of ... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • 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»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • 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»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • 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»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • In-situ comparisons of moored acoustic Doppler profilers with conventional VACM and VMCM current meters

    Publication Year: 1995, Page(s):59 - 64
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (520 KB)

    Experiments in Massachusetts Bay, the North Atlantic and the Northern California Shelf are examined where 150 and 300 kHz RD Instruments acoustic Doppler current profilers (ADCPs) were deployed near vector averaging (VACM) and vector measuring (VMCM) current meters. The ADCPs were deployed in-line on surface moorings, in both upward and downward looking configurations. Comparisons of ADCP velociti... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.