Metocean Measurements from ADCPs...2018/11/29  · Metocean Measurements from ADCPs SUT SOUTH WEST...

Metocean Measurements from ADCPs

SUT SOUTH WEST EVENING MEETING – 29 NOVEMBER 2018 - PLYMOUTH

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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

CLAIRE.CARDY@NORTEKGROUP.COM