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

Outline Sentinel V System Overview Sentinel V Currents and Waves Data Review

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

EZ Connectivity Wireless Interface Wired Connection 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

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

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

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!

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

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

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

Velocity software uses 2D & 3D plotting so you can see the Big Picture Patterns & Trends Squint Left to Right (time, track) Top to Bottom In and Out One to Another (e.g., Beams, Parameters)

Velocity software uses 1D plotting so you can see the Detail Data values Stare Summary (Statistics) Center value & variation Span & Spread Symmetry & Strays Clumps & Gaps

Flexible Processing Standard / Advanced Velocity software provides basic and advanced post processing Flexible Processing Standard / Advanced Interactive Control of Data Thresholds

Outlier Removal One pass screening & Interpolation Velocity software provides basic and advanced post processing Outlier Removal One pass screening & Interpolation Interactive Control of Data Thresholds

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

Why Measure Waves? Critical Factor for Coastal Region Safety 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 Some motivating factors for study of Waves

Traditional Methods for 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

Waves energy propagation

Orbital Wave Energy is flattened due to the bottom

Energy of short waves decays with depth

Triplet Method

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

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)

Array Method

Array Method-Devices Devices Data 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

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

Teledyne RDI Waves Measurements

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

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

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

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

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

Teledyne RD Instruments Wave Gauge

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

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

Currents Only Sampling Strategy 10 Min 10 Min Burst Ping Ensembles 8 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

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

Sentinel V Currents and Waves Measurements