Sentinel V ADCP - In Search of the Perfect Wave

1. Sentinel V ADCP - In Search of the Perfect Wave Presented By: Aaron Robertson and Darryl Symonds 12June2014

2. Outline • Sentinel V System Overview • Sentinel V Currents and Waves Data Review

3. Sentinel V – Designed for Flexibility Four Beams: Our standard to ensure Quality Data A 5th Beam: to Provide Added Value TRDI Supplied Battery And…. The Product is Sized to meet the demands of the discoveries you are searching. Over the Counter Battery No Battery

4. EZ Connectivity • Wireless Interface • Wireless setup • Wireless download • Wireless updates • Wired Connection • TCP/IP Ethernet connection • RS232/422/485 • Single Digit Start Up • Start with a touch of your finger

5. Hassle Free Hardware • Captive Hex Bolts • Find them instead of looking for them! • Quick Connect Handle • Securely and comfortably carry two at once, …instead of cradling it!

6. Power and more Power • 2 Different Battery Options: • Battery chamber using off the shelf Alkaline D Cells 1 - 3 month typical deployment setups • Alkaline D Cell Battery Pack 12 – 24 month typical deployment setups • External Battery Case • Provide an added 100 or 1000+ Watt Hours

7. Worry Free Battery Replacement! • Flood Resistant Electronics Chamber • Separate Battery and Electronics chambers • Captured O-rings • Dove tail groove retains o-ring in its groove • Oring Tool allows you to keep your groove!

8. Worry Free Data Collection! • Record all your data and never consider anything less! • 16GB SD Card standard • 32GB Option (release TBD) 16GB • Raw Data Stored • Single Ping Beam Data • Reprocess data at different averaging intervals • Improved Data Quality Controls • Remove Outliers in Post Processing • Ability to Improve Diagnostic Review of Data 32GB

9. Data Collection Options! • *Multiple Access* Profiling • Allows mulitple users to profile on a coordinated basis • Interleaved and/or successive profiling setups • Operating at independent and selectable rates • *Two Minds* Profiling • Deploy concurrent “safe” and “experimental” setups • Interleave different setups each optimized for much different flow conditions • Uninterrupted Data Collection • Upload of recorded data in the background • On-the-fly reconfiguration of profiling

10. A Fifth Beam for More Coverage! • Vertical Beam • Measures • vertical velocity profile • range to the surface • high resolution echo intensity profile • Allows • turbulence measurements • error velocity validation with 3 beam solutions • redundant error velocity validation with 4 beams • zero up waves parameter

11. Velocity software uses 2D & 3D plotting so you can see the Big Picture

12. Velocity software uses 1D plotting so you can see the Detail

13. Flexible ProcessingStandard / Advanced Velocity software provides basic and advanced post processing InteractiveControl of Data Thresholds

14. Outlier RemovalOne pass screening & Interpolation Velocity software provides basic and advanced post processing InteractiveControl of Data Thresholds

15. Overview • Background of Measuring Waves • TRDI ADCP Wave Measurement • TRDI Currents & Waves Measured with a Sentinel V

16. Why Measure Waves? • Critical Factor for Coastal Region • Beaches … summer fun, winter destruction • Coastal economy • Safety • Shipping & Boating: ocean routes, coastal lanes • Coastal Destruction: storm surges, tsunamis • Coastal and Offshore Engineering • Shore Protection, Structures: design, survival • Mechanism for restoring natural equilibrium • Energy Source • Wave & Tidal Power

17. Traditional Methodsfor Measuring Wave Direction • Triplet Method • PUV triplet • Single point current meter w pressure • Surface Following Device • Heave/Pitch/Roll buoy • Array Method • Spatial Array of Sensors (small, large) • pressure sensors, capacitance wave staffs

18. Waves energy propagation

19. Orbital Wave Energy is flattened due to the bottom

20. Energy of short waves decays with depth

21. Triplet Method

22. Triplet Method - Devices • 3 time series of mutually orthogonal (x,y,z) information about wave field measured at one location • 2 variables related to first order (x,y) spatial derivatives of water surface, another to temporal surface variability • PUV: Pressure, u/v components of velocity • Subsurface current meter with pressure sensor • HPR: heave, pitch, roll • Surface tracking buoy

23. Triplet Method - Check List • 50-year history, convenient to use, accepted, standard processing method • Considerations • Directional resolution, poor high frequency response • Shallower waters for PUV except for lower frequencies, Deeper waters for HPR (compliance in mooring) • Issues for attention • Strong currents, Multi-directional wave field • Directional spread can be broad (cf. high resolution Max Entropy method: too narrow)

24. Array Method

25. Array Method-Devices • Devices • Pressure sensors, wave staffs • Horizontal profiling sonar • Data • Multiple time series of information about wave field measured at varying spatial separation • Amplify pressure data observed at depth to equivalent surface values • Amount of amplification varies with frequency

26. Array Method-Check List • 50-year history, superior directional resolution, differing processing methods • Considerations • High frequency response limited to shallower waters except for lower frequencies • Measuring lower frequencies requires extensive array size to resolve direction while keeping small lags to avoid aliasing • Issues for Attention • Strong currents

27. Teledyne RDIWaves Measurements

28. PUV – Triplet Processing P P P Pressure = Non Directional Wave Data: Hs, Tp UV Velocity Bin = Directional Wave Data: Dp

29. UVW – Triplet Processing UV Velocity Bin = Directional Wave Data: Dp W Velocity Bin = Non Directional Wave Data: Hs, Tp

30. Vertical Beam Surface Tracking – Triplet Processing Vertical Beam = High Resolution Non Directional Spectrum: Hs, Tp UV Velocity Bin = Directional Wave Data: Dp

31. 4 Slant Beams Surface Tracking – Triplet Processing 4 Slant Beams = High Resolution Non Directional Spectrum: Hs, Tp UV Velocity Bin = Directional Wave Data: Dp

32. Orbital Waves Processing • 4-20 Independent Sensors form an Array • Directional Spectrum with IMLM • Provides Highly Accurate Waves Direction & Multiple Directions: Dp

33. Teledyne RD Instruments Wave Gauge

34. 4-s Wind Waves from East 10-s Swell from West Waves from Multiple Directions N HIGH Frequencies W E LOW Frequencies S

35. Currents Only Sampling Strategy Single Ping Ensembles 10min Ensemble 10min Ensemble Multiple Ping Ensembles Evenly Spaced in Time 10min Ensemble 10min Ensemble Multiple Ping Burst Ensembles 10min Ensemble 10min Ensemble

36. Currents Only Sampling Strategy 10 Min 10 Min Burst Ping Ensembles8 Pings/Ens * 6 Ens/Hr = 48 Pings/hr 10 Min 10 Min Burst Ping Ensembles + Burst Ensembles 2 Pings/Ens * 24 Ens/Hr = 48 Pings/Hr 10 Min 10 Min

37. Waves Sampling Strategies Waves Burst duration is User Selectable, min/typical 20mins 10min Current Ens. Pings for Waves Burst are 2Hz 10min Current Ens. Current Ens. Are User Selectable typical 10mins 10min Current Ens. 10min Current Ens. Pings for Current Ens. within Waves burst are shared with Wave Burst 10minCurrent Ens. 10min Current Ens. A set of Pings for Current Ens. outside Waves burst are at User Selected Interval

38. Sentinel V Currents and Waves Measurements