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ACOUSTIC WAVE AND CURRENT PROFILER

AWAC - 1 MHz

Real-time current profiles and directional waves for shallow water

Technical specification (PDF)
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Highlights

  • Real-time current profiles to 30 m range
  • Real-time directional waves to 35 m range
  • Acoustic surface tracking (AST) with vertical beam
  • Can be used both with fixed frames and subsurface buoys

Overview

  • The AWAC 1 MHz ADCP has become the standard reference technology in submerged wave-measurement applications. Thousands of these ADCPs have been deployed to capture the full wave spectrum in combination with current profiles. With a 35 m maximum range for wave measurements and 4 Hz sampling of the surface elevation, the AWAC 1 MHz is the optimal tool for shallow current and wave measurements.

Applications

  • Online measurements of currents and waves
  • Design data for planning of new coastal structures
  • Site studies for offshore wind platforms
  • Coastal erosion studies
  • Measurement campaigns where the full wave spectrum is needed
  • Monitoring of transient waves for channel wall protection
  • Studies of tidal currents
AWAC deployment on two subsurface buoys.
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    • Water velocity measurements

      Maximum profiling range 30 m
      Cell size 0.25-4.0 m
      Number of cells Typical 20-40, max. 128
      Velocity range ±10 m/s horizontal, ±5 m/s along beam
      Accuracy ±1% of measured value ±0.5 cm/s
      Velocity precision Consult instrument software
      Maximum output rate 1 Hz
      Internal sampling rate 7 Hz

    • Echo intensity (along slanted beams)

      Sampling Same as velocity
      Resolution 0.45 dB
      Dynamic range 90 dB
      Transducer acoustic frequency 1 MHz
      Number of beams 3 beams 120° apart, one vertical beam (90° apart, one at 5° for platform mount)
      Beam width 1.7°
      Beam width vertical beam 1.7°

    • Wave measurement option (AST)

      Maximum depth 35 m
      Data types Pressure, one velocity along each beam, AST
      Sampling rate velocity (output) 2 Hz
      Sampling rate AST (output) 4 Hz
      No. of samples per burst 512, 1024 or 2048

    • Wave estimates

      Range -15 to 15 m
      Accuracy/resolution (Hs) < 1% of measured value / 1 cm
      Accuracy/resolution (Dir) 2° / 0.1°
      Period range 0.5-50 s
      Cut-off period (Hs) 5 m depth: 0.5 sec, 20 m depth: 0.9 sec, 60 m depth: 1.5 sec
      Cut-off period (dir) 5 m depth: 1.5 sec, 20 m depth: 3.1 sec, 60 m depth: 5.5 sec

    • Sensors

      Temperature: Thermistor embedded in housing
      Temp. range -4 to +40 °C
      Temp. accuracy/resolution 0.1 °C/0.01°C
      Temp. time response < 5 min
      Compass: Magnetoresistive
      Accuracy/resolution 2°/0.1° for tilt <15°
      Tilt: Liquid level
      Accuracy/resolution 0.2°/0.1°
      Maximum tilt 30°,AST requires <10° instrument tilt
      Up or Down Automatic detect
      Pressure: Piezoresistive
      Range 50 m
      Accuracy 0.5% of full scale (optional 0.1% of full scale)
      Resolution 0.005% of full scale

    • Analog inputs

      No. of channels 2
      Supply voltage to analog output devices Three options selectable through firmware commands: Battery voltage/500 mA, +5V/250 mA, +12V/100 mA
      Voltage input 0-5 V
      Resolution 16-bit A/D

    • Data Recording

      Capacity 9 MB standard, 4/16 GB (Prolog)
      Profile record Ncells*9 + 120 bytes
      Wave record Nsamples*24 + 1k bytes
      Mode Stop when full (default and Prolog) or wrap mode

    • Real Time Clock

      Accuracy ±1 min/year
      Backup in absence of power 1 year

    • Data Communications

      I/O RS-232 or RS-422. Software supports most commercially available USB– RS-232 converters
      Communication baud rate 300- 115200 Bd
      Recorder download baud rate 600/1200 kBd for both RS-232 and RS-422
      User control Handled via "AWAC AST" software, or ActiveX® controls. "Seastate" for online systems
      Output formats NMEA, Binary. Prolog provides same types also for processed wave and current data.

    • Connectors

      Bulkhead (Impulse) MCBH-2-FS, MCBH-8-FS, optional Souriau M-series metal connector for online use
      Cable PMCIL-8-MP on 10 m polyurethane cable, metal connector optional

    • Software

      Functions Deployment planning, instrument configuration, data retrieval and conversion. (for Windows®)

    • Power

      DC input 9- 18V DC
      Maximum peak current 3 A
      Avg. power consumption 0,65 W
      Sleep current < 100 μA
      Transmit power 1-30W, 3 adjustable levels

    • Environmental

      Operating temperature -4 to +40 °C
      Storage temperature -20 to +60 °C
      Shock and vibration IEC 721-3-2
      EMC approval IEC 61000
      Depth rating 300m

    • Materials

      Standard model POM and polyurethane plastics with titanium fasteners

    • Dimensions

      Maximum diameter 210 mm
      Maximum length 175 mm

    • Weight

      Weight in air 6.1 kg
      Weight in water 2.9 kg

    • Online cable

      Polyurethane jacket, Shore D hardness, 13mm in diameter, max 2km. Inquire for longer cables

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    • Technical drawings

      AWAC 1MHz General Arrangement-2 - NGA009-001 Rev.-

      Download this

    • Approvals

      Declaration of conformity

      Download this

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    • Main product

      01

      AWAC 1 MHz, four beams

    • Probe type / Head

      01

      Symmetrical transducer orientation

      02

      Platform head

    • Memory

      01

      9 MB of memory on motherboard (M8)

      02

      4 GB SD card data logger

      03

      16 GB SD card data logger

      04

      ProLog with wave processing

    • Pressure sensors

      01

      Pressure sensor, 0-10 m

      02

      Pressure sensor, 0-20 m

      03

      Pressure sensor, 0-20m, accuracy 0,1% of FS

      04

      Pressure sensor, 0-30 m

      05

      Pressure sensor, 0-50 m

      06

      Pressure sensor, 0-50m, accuracy 0,1% of FS

      07

      Pressure sensor, 0-100 m

      08

      Pressure sensor, 0-100m, accuracy 0,1% of FS

      09

      Pressure sensor, 0-200m

    • Cables

      01

      10m RS232 polyurethane cable with 8-pin inline connector and USB converter

      02

      20m RS232 polyurethane cable with 8-pin inline connector and USB converter

      03

      30m RS232 polyurethane cable with 8-pin inline connector and USB converter

      04

      40m RS232 polyurethane cable with 8-pin inline connector and USB converter

      05

      50m RS232 polyurethane cable with 8-pin inline connector and USB converter

      06

      10m RS422 polyurethane cable with 8-pin inline connector and USB converter

      07

      20m RS422 polyurethane cable with 8-pin inline connector and USB converter

      08

      30m RS422 polyurethane cable with 8-pin inline connector and USB converter

      09

      40m RS422 polyurethane cable with 8-pin inline connector and USB converter

      010

      50m RS422 polyurethane cable with 8-pin inline connector and USB converter

    • Other

      01

      Compass and tilt sensor

      02

      Without compass and tilt sensor

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