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Metocean Measurements from ADCPs
SUT SOUTH WEST EVENING MEETING – 29 NOVEMBER 2018 - PLYMOUTH
nortekgroup.com
CLAIRE CARDY, DIRECTOR, NORTEK UK
What are ADCPs, How do they work?
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Beam 1
Cell n
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How are ADCPs used?
Advances in Marine Measurements:
- The latest generation of ADCPs -
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Nortek’s Signatures
Nortek’s Signature ADCPs
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Why are these ADCPs different?
Size
Processing methods
Power
Sampling Rate
Metocean parameters
Application Specific
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Metocean Parameters
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What can the Signatures measure?
• Average, Burst and High Resolution Currents
• Wave height and direction, Ice draft and drift
• Backscatter - echosounder
> 1000m
55 kHz
Narrowband
500m
75 kHz
Broadband
Improving current measurementsSurface buoys
Beam 1’
Beam 2’
1
2
3
4
5
6
7
8
9
Beam 1Beam 2
15°
15°
ADCP
+AHRS
1. Addition of Attitude and Heading Reference Sensor (AHRS)
• Accelerometer + Magnetometer + Gyroscope
• High response rate (100 Hz)
2. Real-time bin mapping on ping-by-ping basis
3. Precise ping timing by sampling AHRS during receipt of returned
signal
Improving current measurements
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Surface buoys
Enabling New Technology
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Marine Autonomy and Vessels
Size
Payload
ADCP Requirements
Interfacing
On board data storage
Online data transmission
Navigation
Speed of Vehicle
Each vehicle is different =
customised solutions
Improving Understanding of ProcessesTurbulence
Tu
rbu
len
t K
ine
tic E
ne
rgy S
pe
ctr
a
10-2
10-1
100
101
Frequency (Hz)
10-5
10-4
10-3
10-2
10-1
100
S (
m2/s
2H
z-1
)
~f -5/3
ADVADCPAD2CP
velocity
Improving Understanding of Processes
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Biological Studies
Improving Understanding of Processes
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Multidisciplinary Projects
Summary
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Metocean Measurements from ADCPs
• ADCPs vary and are selected according to the application and deployment method
• Modern ADCPs like Nortek’s Signatures measure more than just currents and are
much more capable than traditional ADCPs
• Advances in technology and emerging new markets drive ADCP functionality
Questions?
SUT SOUTH WEST EVENING MEETING – 29 NOVEMBER 2018 - PLYMOUTH
nortekgroup.com
CLAIRE CARDY, DIRECTOR, NORTEK UK
