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Acoustic D oppler Solutions
RD InstrumentsHome of the ADCP
Measuring Water in Motion and Motion in WaterAcoustic D oppler SolutionsAcoustic D oppler Solutions
THETIS Waves THETIS Waves Data QAData QA
Acoustic D oppler SolutionsRD RD
InstrumentsInstrumentsHome of the Home of the
ADCPADCP
Acoustic D oppler Solutions
RD InstrumentsHome of the ADCP
Measuring Water in Motion and Motion in WaterAcoustic D oppler SolutionsAcoustic D oppler Solutions
THETIS WAVES DATA QA
1.1. RD Instruments OverviewRD Instruments Overview
2.2. Capability of ADCP waves ArrayCapability of ADCP waves Array
3.3. Initial Data Processing + Interpretation Initial Data Processing + Interpretation
4.4. Data Recovery + Re-ProcessingData Recovery + Re-Processing
5.5. Re-Processed Data QARe-Processed Data QA
Acoustic D oppler Solutions
Acoustic D oppler Solutions
RD InstrumentsHome of the
ADCP
Measuring Water in Motion and Motion in Water
Company & CapabilitiesCompany & Capabilities
Acoustic D oppler Solutions
RD InstrumentsHome of the ADCP
Measuring Water in Motion and Motion in WaterAcoustic D oppler SolutionsAcoustic D oppler Solutions
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 ADCP. 1995: 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 2004: Waves from a Horizontal2004: Waves from a Horizontal
History of InnovationHistory of Innovation
Acoustic D oppler Solutions
RD InstrumentsHome of the ADCP
Measuring Water in Motion and Motion in WaterAcoustic D oppler SolutionsAcoustic D oppler Solutions
Business UnitsBusiness Units
Marine MeasurementsMarine Measurements Underwater NavigationUnderwater Navigation Water ResourcesWater Resources Man-made channelsMan-made channels
Acoustic D oppler Solutions
RD InstrumentsHome of the ADCP
Measuring Water in Motion and Motion in WaterAcoustic D oppler SolutionsAcoustic D oppler Solutions
ADCP Waves Array Method ADCP Waves Array = remote sensed array of ADCP Waves Array = remote sensed array of
sensorssensors 12x near surface “orbital motion” senors – 12x near surface “orbital motion” senors –
Array processing for directionArray processing for direction 3x independent estimates of non-directional 3x independent estimates of non-directional
informationinformation Easy standard processingEasy standard processing Powerful data recovery capabilityPowerful data recovery capability Automated data recovery – June 2005Automated data recovery – June 2005
Acoustic D oppler Solutions
RD InstrumentsHome of the ADCP
Measuring Water in Motion and Motion in WaterAcoustic D oppler SolutionsAcoustic D oppler Solutions
Acoustic Doppler Solutions
Constructing the ARRAY?
Acoustic D oppler Solutions
RD InstrumentsHome of the ADCP
Measuring Water in Motion and Motion in WaterAcoustic D oppler SolutionsAcoustic D oppler Solutions
PUV Processing Provides Biased Measurements
Direction #1
Directi
on #2
Biased Direction
Array Processing Allows Multiple Directions to be Measured at a Single Frequency
Array Processing Avoids Bias in Direction Statistics
Acoustic D oppler Solutions
RD InstrumentsHome of the ADCP
Measuring Water in Motion and Motion in WaterAcoustic D oppler SolutionsAcoustic D oppler Solutions
Deployment Guidelines
Bottom Mounted, for Tide, Currents + Multi-Bottom Mounted, for Tide, Currents + Multi-Directional WavesDirectional Waves
In Line Frame, Mooring, Upwards Looking for In Line Frame, Mooring, Upwards Looking for Currents + Uni-Directional Waves Currents + Uni-Directional Waves
Real Time or Self Contained OperationReal Time or Self Contained Operation Frequency ChoiceFrequency Choice
Bottom Mounted, for Tide, Currents + Multi-Bottom Mounted, for Tide, Currents + Multi-Directional WavesDirectional Waves
In Line Frame, Mooring, Upwards Looking for In Line Frame, Mooring, Upwards Looking for Currents + Uni-Directional Waves Currents + Uni-Directional Waves
Real Time or Self Contained OperationReal Time or Self Contained Operation Frequency ChoiceFrequency Choice ADCP
Frequency (kHz)
Depth Range (m)
1200 2.5 - 15600 5 - 48300 10 - 100
Acoustic D oppler Solutions
RD InstrumentsHome of the ADCP
Measuring Water in Motion and Motion in WaterAcoustic D oppler SolutionsAcoustic D oppler Solutions
Deployment Guidelines
Frequency Decay With Depth
0.0
2.0
4.0
6.0
8.0
10.0
12.0
14.0
16.0
5.0 10.0 20.0 40.0 80.0 120.0
Depth
Min
imu
m M
ea
sura
ble
W
ave
Pe
rio
d
Directional (array) Non Directional (velocity) Non-Directional (pressure)
Acoustic D oppler Solutions
RD InstrumentsHome of the ADCP
Measuring Water in Motion and Motion in WaterAcoustic D oppler SolutionsAcoustic D oppler Solutions
WavesMon for Data Processing
Process self contained dataProcess self contained data Extract currents + wave dataExtract currents + wave data Generate output filesGenerate output files Real-time data collection + Real-time data collection +
display capabilitydisplay capability Generate real time graphic Generate real time graphic
data outputdata output
Acoustic D oppler Solutions
RD InstrumentsHome of the ADCP
Measuring Water in Motion and Motion in WaterAcoustic D oppler SolutionsAcoustic D oppler Solutions
WavesMon Auto Setup (1)
Click Auto Setup. Click Auto Setup. At the ADCP Data At the ADCP Data
File dialog box, File dialog box, select the data file select the data file to be opened by to be opened by using the Browse using the Browse button. button.
Click Open. Click Open.
Acoustic D oppler Solutions
RD InstrumentsHome of the ADCP
Measuring Water in Motion and Motion in WaterAcoustic D oppler SolutionsAcoustic D oppler Solutions
Enter the ADCP Enter the ADCP Altitude Above Altitude Above Bottom when the Bottom when the ADCP was ADCP was deployed. deployed.
Click OK.Click OK.
WavesMon Auto Setup (2)
Acoustic D oppler Solutions
RD InstrumentsHome of the ADCP
Measuring Water in Motion and Motion in WaterAcoustic D oppler SolutionsAcoustic D oppler Solutions
Click GO Click GO
WavesMon Auto Setup (3)
Acoustic D oppler Solutions
RD InstrumentsHome of the ADCP
Measuring Water in Motion and Motion in WaterAcoustic D oppler SolutionsAcoustic D oppler Solutions
Data QA—Check List
Use WaveView to verify data quality ( *.wvs file) Check for reasonable parameters in the time series
(Hs, Tp, Dp) Check error log
Check for agreement in 1-D spectra
Check for reasonable high frequency cutoff
Check for reasonable directional spectra
Acoustic D oppler Solutions
RD InstrumentsHome of the ADCP
Measuring Water in Motion and Motion in WaterAcoustic D oppler SolutionsAcoustic D oppler Solutions
Check for reasonable parameters in the time series (Hs, Tp, Dp)
Much Lost data = ISSUE!Much Lost data = ISSUE!
Acoustic D oppler Solutions
RD InstrumentsHome of the ADCP
Measuring Water in Motion and Motion in WaterAcoustic D oppler SolutionsAcoustic D oppler Solutions
Check Error Log (wmerrlog.txt)
Near surface bin (#2) has low percentage of good samples. 90 % good is required to complete processing of Velocity Array
Acoustic D oppler Solutions
RD InstrumentsHome of the ADCP
Measuring Water in Motion and Motion in WaterAcoustic D oppler SolutionsAcoustic D oppler Solutions
Reasons for bad near surface bin in array?
Check quality of ensemble averaged velocity data
Check for excessive tilts Check readings of pressure
sensor relative to surface track
Acoustic D oppler Solutions
RD InstrumentsHome of the ADCP
Measuring Water in Motion and Motion in WaterAcoustic D oppler SolutionsAcoustic D oppler Solutions
Check Quality of Ensemble Averaged Velocity Data
Low Error Velocity = Good near surface data
Acoustic D oppler Solutions
RD InstrumentsHome of the ADCP
Measuring Water in Motion and Motion in WaterAcoustic D oppler SolutionsAcoustic D oppler Solutions
Check For Excessive Pitch + Roll
<5 degrees pitch + roll = Good hardware deployment
Acoustic D oppler Solutions
RD InstrumentsHome of the ADCP
Measuring Water in Motion and Motion in WaterAcoustic D oppler SolutionsAcoustic D oppler Solutions
Check readings of pressure sensor relative to surface
track (1) Re-Process using expert option – use surface track for depth Compare results with pressure sensor based depth measurement (ascii log file format 5) Calculate difference (excell)
Acoustic D oppler Solutions
RD InstrumentsHome of the ADCP
Measuring Water in Motion and Motion in WaterAcoustic D oppler SolutionsAcoustic D oppler Solutions
Check readings of pressure sensor relative to surface
track (2) Result = 1217 mm average difference
(pressure – surface) Depth During Wave Burst
0
2000
4000
6000
8000
10000
12000
14000
1 17 33 49 65 81 97 113 129 145 161
Wave Burst #
Dep
th (m
m)
Pressure
Surface Track
Acoustic D oppler Solutions
RD InstrumentsHome of the ADCP
Measuring Water in Motion and Motion in WaterAcoustic D oppler SolutionsAcoustic D oppler Solutions
Re-Process (1) Add pressure sensor offset -1217 mm Use pressure sensor for Depth Use bottom 2 bins in array
A cous tic D opp le r S o lu tions
Acoustic D oppler Solutions
RD InstrumentsHome of the ADCP
Measuring Water in Motion and Motion in WaterAcoustic D oppler SolutionsAcoustic D oppler Solutions
Data QA—Check List
Use WaveView to verify data quality ( *.wvs file) Check for reasonable parameters in the time series (Hs, Tp,
Dp) Check error log
Check for agreement in 1-D spectra
Check for reasonable high frequency cutoff – EXPECT ERRORS in Default Values – Deeper Bins –More Signal Attenuation – Must decrease high frequency Cutoff
Check for reasonable directional spectra
Acoustic D oppler Solutions
RD InstrumentsHome of the ADCP
Measuring Water in Motion and Motion in WaterAcoustic D oppler SolutionsAcoustic D oppler Solutions
Check High Frequency Cutoff Incorrectly set high frequency cutoff will result in high Hs, incorrect Tp, incorrect Dp Proper HF cutoff for Vspec = 0.38 hz
Acoustic D oppler Solutions
RD InstrumentsHome of the ADCP
Measuring Water in Motion and Motion in WaterAcoustic D oppler SolutionsAcoustic D oppler Solutions
Re-Process (2) Add pressure sensor offset -1217 mm Use pressure sensor for Depth Use bottom 2 bins in array Change High Frequency Cutoff to 0.38 hz
A cous tic D opp le r S o lu tions
Acoustic D oppler Solutions
RD InstrumentsHome of the ADCP
Measuring Water in Motion and Motion in WaterAcoustic D oppler SolutionsAcoustic D oppler Solutions
Data QA—Check List
Use WaveView to verify data quality ( *.wvs file) Check for reasonable parameters in the time series
(Hs, Tp, Dp) Check error log
Check for agreement in 1-D spectra
Check for reasonable high frequency cutoff
Check for reasonable directional spectra
Acoustic D oppler Solutions
RD InstrumentsHome of the ADCP
Measuring Water in Motion and Motion in WaterAcoustic D oppler SolutionsAcoustic D oppler Solutions
Check for reasonable parameters in the time series (Hs, Tp, Dp)
Acoustic D oppler Solutions
RD InstrumentsHome of the ADCP
Measuring Water in Motion and Motion in WaterAcoustic D oppler SolutionsAcoustic D oppler Solutions
Check error log One surface tracking burst “bad”One surface tracking burst “bad”
Acoustic D oppler Solutions
RD InstrumentsHome of the ADCP
Measuring Water in Motion and Motion in WaterAcoustic D oppler SolutionsAcoustic D oppler Solutions
Check for agreement in 1-D spectra / Check for reasonable
high frequency cutoff
Acoustic D oppler Solutions
RD InstrumentsHome of the ADCP
Measuring Water in Motion and Motion in WaterAcoustic D oppler SolutionsAcoustic D oppler Solutions
Check Directional Spectra
Acoustic D oppler Solutions
RD InstrumentsHome of the ADCP
Measuring Water in Motion and Motion in WaterAcoustic D oppler SolutionsAcoustic D oppler Solutions
Conclusion
Pressure sensor in errorPressure sensor in error Data recovered with advanced processing optionsData recovered with advanced processing options Detailed pressure sensor inspection requiredDetailed pressure sensor inspection required Possible re-calibrationPossible re-calibration RDI Europe Field Serivce to adviseRDI Europe Field Serivce to advise
Acoustic D oppler Solutions
RD InstrumentsHome of the ADCP
Measuring Water in Motion and Motion in WaterAcoustic D oppler SolutionsAcoustic D oppler Solutions
ADCP Waves Array Method ADCP Waves Array = remote sensed array of ADCP Waves Array = remote sensed array of
sensorssensors 12x near surface “orbital motion” senors – 12x near surface “orbital motion” senors –
Array processing for directionArray processing for direction 3x independent estimates of non-directional 3x independent estimates of non-directional
informationinformation Easy standard processingEasy standard processing Powerful data recovery capabilityPowerful data recovery capability Automated data recovery – June 2005Automated data recovery – June 2005