Home of the ADCP Measuring Water in Motion and Motion in Water.

Home of the ADCP

Measuring Water in Motion and Motion in Water

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Home of the ADCP


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Web site: www.adcp.com


ADCPs on ShipsADCPs on Ships

Home of the ADCP


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Your instructorTitleTitle: Research Scientist, Technical : Research Scientist, Technical MarketingMarketing

Time at RD InstrumentsTime at RD Instruments: : 1990-20061990-2006

EducationEducation: : Ph.D., Ocean Physics, Ph.D., Ocean Physics, Velocity ProfilersVelocity Profilers

Relevant WritingsRelevant Writings: : See TRDI Web site --See TRDI Web site --Tech Tips page Tech Tips page

ContactContact: [email protected]: [email protected]: +1.858.254.4140Cell: +1.858.254.4140

Pete Spain

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Course objectives

Current SurveysCurrent Surveys

Ocean Surveyor / WH MarinerOcean Surveyor / WH Mariner

DataData

Installation ConcernsInstallation Concerns

Software SetupSoftware Setup

Data QA/QCData QA/QC

Operational LimitationsOperational Limitations

By completing this course, you will understand clearly


Measuring Water in Motion

ADCPsAcoustic Doppler Current Profilers

Measuring Water in Motion

ADCPsAcoustic Doppler Current Profilers

Acoustic D oppler Solutions


Why Make Spatial Current Surveys?

Applied ScienceApplied Science OceanographyOceanography Coastal DynamicsCoastal Dynamics

Environmental InformationEnvironmental Information Impact statementsImpact statements Advection – Dispersion modelingAdvection – Dispersion modeling Feeding behaviorFeeding behavior Forcing on structuresForcing on structures


Who/What is Teledyne RDI?

Part of Teledyne TechnologiesPart of Teledyne Technologies

High technology business in San Diego, High technology business in San Diego,

California, since 1981 California, since 1981

Develop advanced technology systemsDevelop advanced technology systems

Make them useful to a broad range of Make them useful to a broad range of

marine/river/navigation applicationsmarine/river/navigation applications

190 staff and over $36M in 2005 sales190 staff and over $36M in 2005 sales

More than 7500 ADCPs sold worldwideMore than 7500 ADCPs sold worldwide

Presently 60 units per monthPresently 60 units per month

24/7 Customer Support24/7 Customer Support

ISO 9001-2000 certifiedISO 9001-2000 certified


1981: First commercial ADCP in the world1981: First commercial ADCP in the world 1985: First river discharge ADCP1985: First river discharge ADCP 1991: Broadband ADCP patent1991: Broadband ADCP patent 1994: Phased array ADCP patent1994: Phased array ADCP patent 1995: Workhorse ADCP1995: Workhorse ADCP 1999: ADCP waves array patent1999: ADCP waves array patent 2001: Horizontal ADCP2001: Horizontal ADCP 2002: ZedHed: Shallow-depth ADCP2002: ZedHed: Shallow-depth ADCP 2003: StreamPro, Channel Master2003: StreamPro, Channel Master

History of InnovationHistory of Innovation


Chesapeake Bay Plume Offshore of North Carolina

Coastal Dynamics


Tidally generated eddy off Three Trees Point

Coastal Dynamics

Photo and plot courtesy of Prof. Parker MacCready (University of Washington).


JAMSTEC RV Kaiyo off of Mindanao, PhilippinesJAMSTEC RV Kaiyo off of Mindanao, Philippines

Vessel Mounted ADCPs


Volunteer Observing Ships

Courtesy Charles Flagg, Brookhaven National LaboratoryCourtesy Charles Flagg, Brookhaven National Laboratory



Explorer of the Seas



Oleander

Courtesy Charles Flagg, Brookhaven National LaboratoryCourtesy Charles Flagg, Brookhaven National Laboratory


Recovery of the Ehime Maru

Image courtesy of the US Navy

Image courtesy of the US Navy


Images courtesy of Texas A&M


Ancillary Data

Zooplankton MigrationZooplankton Migration


Ancillary DataAvoidance BehaviorAvoidance Behavior

Courtesy of Gwyn Griffiths (SOC)


ADCP vs Current Meters


Moving Platforms

Speed over groundSpeed over ground AltitudeAltitude


Vessel-Mounted ADCP Package

ADCP TransducerADCP Transducer

ADCP Transducer CableADCP Transducer Cable

ADCP Electronics ChassisADCP Electronics Chassis

ADCP Data Acquisition SoftwareADCP Data Acquisition Software


Ocean Surveyor

Mariner

Phased Array / Piston Transducers


Transducers

B1 B2 B3 B4B 1 B 2 B 3 B 4


Cabling Options

Wet end: Right Angled or Straight-in Connector

Dry end: Loose or Attached


ADCP Electronics ChassisADCP Electronics Chassis Serial Comms. InterfaceSerial Comms. Interface Attitude Interface (Synchro/Stepper)Attitude Interface (Synchro/Stepper)

ADCP Data Acquisition SoftwareADCP Data Acquisition Software ADCP Setup & ControlADCP Setup & Control GPS NMEA InterfaceGPS NMEA Interface Attitude NMEA InterfaceAttitude NMEA Interface



Supplied by the user:Supplied by the user: Vessel Heading InterfaceVessel Heading Interface Vessel GPS InterfaceVessel GPS Interface Dedicated ComputerDedicated Computer Sea Chest (or well) to install the ADCPSea Chest (or well) to install the ADCP



Block Diagram of Vessel Mounted Setup

ADCP Chassis

ADCP Transducer

Vessel GPS

Vessel Heading

Vessel Computer

Serial Serial (NMEA) (NMEA)

OROR Synchro/ Synchro/ Stepper Stepper

Vessel Pitch/Roll

Serial Serial (NMEA) (NMEA) OR OR

SynchroSynchro

Speed Log Data

Raw Data


Depth Below Keel

(meters)

Range (meters)

RDI’s ADCP Answer

2 1-20 WH Mariner 1200kHz



50 25-400 OS 150kHz

100 50-700 OS 75kHz

200 100-1000 OS 38kHz

Choosing the Frequency


Narrowband/Broadband

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General Installation Concerns

Engine noiseEngine noise Flow disturbanceFlow disturbance On or off the centerlineOn or off the centerline AttitudeAttitude Large or varying magnetic fieldsLarge or varying magnetic fields Fixture ringingFixture ringing

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Installation Types

Gate valve

Pole

Well

Sonde

Up-lookingMoon Pool

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Conceptual Well Design

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Acoustic Windows

0.75 in 1.5 in

0.5 in 1.0 in

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A “Typical” WinRiver Display

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Communications Tab

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ADCP SETUP Tab

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AVERAGING Tab

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A “Typical” VMDAS Display

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Data QA/QC

Return Signal Strength Intensity (RSSI)Return Signal Strength Intensity (RSSI) CorrelationCorrelation Percent GoodPercent Good Error VelocityError Velocity Inter-beam Comparisons (e.g. fish screening)Inter-beam Comparisons (e.g. fish screening)

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Data QA/QC

Return Signal Strength Intensity (RSSI)Return Signal Strength Intensity (RSSI) Generally expected to decay with rangeGenerally expected to decay with range Increase with range indicates a solid Increase with range indicates a solid

object – e.g. the bottomobject – e.g. the bottom Low scattering concentration can result in Low scattering concentration can result in

data drop outdata drop out

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Data QA/QC

CorrelationCorrelation Measure of how much the scatterer Measure of how much the scatterer

distribution has changed between distribution has changed between measurementsmeasurements

In the absence of a boundary – usually In the absence of a boundary – usually sets the rangesets the range

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Data QA/QC

Percent GoodPercent Good

Percent Good 1: Percentage of solutions that used Percent Good 1: Percentage of solutions that used three beamsthree beams

Percent Good 2: Percentage rejected for high error Percent Good 2: Percentage rejected for high error velocityvelocity

Percent Good 3: Percentage rejected for having Percent Good 3: Percentage rejected for having fewer than three good beamsfewer than three good beams

Percent Good 4: Percentage of solutions that used all Percent Good 4: Percentage of solutions that used all four beamsfour beams

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Data QA/QC

Error VelocityError VelocityFundamental Assumption:Fundamental Assumption: All beams are measuring All beams are measuring

the same flow.the same flow.

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Fish Screening

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VMDAS Data: Typical Display

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Operational Limitations

Weak Scattering LayersWeak Scattering Layers Strong Scattering LayersStrong Scattering Layers Acoustic InterferenceAcoustic Interference Heading Alignment ErrorsHeading Alignment Errors Large Pitch and RollLarge Pitch and Roll

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Weak Scattering LayersWeak Scattering LayersThese can cause velocity dropouts at These can cause velocity dropouts at

a given deptha given depth

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Strong Scattering LayersStrong Scattering LayersThese can cause high velocities in a layer These can cause high velocities in a layer

that seem to depend on the vessel’s speedthat seem to depend on the vessel’s speed

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Acoustic InterferenceAcoustic InterferenceThese can cause velocity drop outs in These can cause velocity drop outs in

diagonal bandsdiagonal bands

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Current Magnitude

Current Direction


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B 1B 2

B 3B 4

Severe pitch/roll Severe pitch/roll This can limit the measurement rangeThis can limit the measurement range

B1 B2 B3 B4


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Severe pitch/roll Severe pitch/roll This can limit the measurement rangeThis can limit the measurement range


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JAMSTEC RV Kaiyo off of Mindanao, PhilippinesJAMSTEC RV Kaiyo off of Mindanao, Philippines



ADCPs on ShipsADCPs on Ships

Home of the ADCP Measuring Water in Motion and Motion in Water.

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Transcript of Home of the ADCP Measuring Water in Motion and Motion in Water.