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Oceanography

AWAC - 400 kHz

Real-time current profiles and directional waves with up to 100 m range

  • Real-time current profiles and waves to 100 m range
  • Acoustic surface tracking (AST) with vertical beam
  • Can be used both with fixed frames and subsurface buoys

Overview

The AWAC 400 kHz 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 100 m maximum range for wave measurements and 1.5 Hz sampling of the surface elevation, the AWAC 400 kHz is the optimal tool for deeper-water current and wave measurements.

  • Currents
  • Waves

Highlights

  • Real-time current profiles and waves to 100 m range
  • Acoustic surface tracking (AST) with vertical beam
  • Can be used both with fixed frames and subsurface buoys

Usage

  • 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

Setup

Designed for straightforward and reliable current and wave measurements in up to 100m of water, the AWAC 400kHz is configured using the AWAC deployment software before installation. The 400kHz AWAC’s wave measurement range is the longest of the AWAC family.

Deployment

AWACs are often bottom-mounted and/or implemented as part of real-time wave monitoring systems. Leading industry partners offer bespoke frames and buoys for the AWAC.

Data

Optional onboard wave processing allows real-time streaming of wave parameters to users onshore. Nortek’s SUV processing method (exclusive to AWACs and Signatures) enables quality wave measurements from a moving subsurface buoy. Nortek postprocessing software and/or display software is available for review or visualization of data, after deployment or in real time.

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Maximum profiling range 100 m
Cell size 1.0-8.0 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 2 Hz

Sampling Same as velocity
Resolution 0.45 dB
Dynamic range 90 dB
Transducer acoustic frequency 400 kHz, 600 kHz for vertical beam
Number of beams 3 beams 120° apart, one vertical beam, (90° apart, one at 5° for platform mount)
Beam width 2.4°
Beam width vertical beam 1.7°

Maximum depth 100 m
Data types Pressure, one velocity along each beam, AST
Sampling rate velocity (output) 0.75 Hz
Sampling rate AST (output) 1.5 Hz
No. of samples per burst 512, 1024 or 2048

Range -15 to 15 m
Accuracy/resolution (Hs) < 1% of measured value / 1 cm
Accuracy/resolution (Dir) 2° / 0.1°
Period range 1-50 s
Cut-off period (Hs) 20 m depth: 0.9 sec, 60 m depth: 1.5 sec, 100 m depth: 2 sec
Cut-off period (dir) 20 m depth: 3.1 sec, 60 m depth: 5.5 sec, 100 m depth: 7.1 sec

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 100 m
Accuracy 0.5% of full scale (optional 0.1% of full scale)
Resolution 0.005% of full scale

No. of channels 2
Supply voltage to analog output devices Three options selectable through firmware commands: 1) Battery voltage/500 mA, 2) +5 V/250 mA, 3)+12 V/100 mA
Voltage input 0-5 V
Resolution 16-bit A/D

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

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

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

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

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

DC input 9-18 V DC
Maximum peak current 3 A
Avg. power consumption 0.23 W
Sleep current < 100 μA
Transmit Power 1-30 W, 3 adjustable levels

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 300 m

Standard model Delrin® and polyurethane plastics with titanium screws

Maximum diameter 306 mm
Maximum length 203 mm

Weight in air 7.3 kg
Weight in water 3.6 kg

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

AWAC 400KHz General Arrangement - NGA009-003 Rev.-

Declaration of conformity

AWAC 400 kHz, four beams

Symmetrical transducer orientation

9 MB of memory on motherboard (M8)

4 GB SD card data logger

16 GB SD card data logger

ProLog with wave processing

Pressure sensor, 0-10 m

Pressure sensor, 0-20 m

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

Pressure sensor, 0-30 m

Pressure sensor, 0-50 m

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

Pressure sensor, 0-100 m

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

Pressure sensor, 0-200m

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

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

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

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

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

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

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

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

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

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

Compass and tilt sensor

Without compass and tilt sensor

Deployment planning, execution and recovery

Deployment planning, execution and recovery

New features, fixes and functionality

Note. Firmware for legacy systems (pre April 2008) with version numbers starting with 0. or 1.

New features, fixes and functionality

Note. Firmware for legacy systems (pre April 2008) with version numbers starting with 0. or 1.

New features, fixes and functionality

Display of profiler data. Can be used in combination with Prof2NDP

Data conversion

Processing of waves

Data processing and ready-to-print reporting software. Request quote for license

Wave and current profile data visualization and processing software for online applications. Request quote for license

Analysis and processing of currents and directional waves. Request quote for license

Analysis and processing of current profiles. Request quote for license

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