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Teledyne RD Instruments Leaders in Acoustic Doppler Current Profilers and Doppler Velocity Logs Measuring Water in Motion and Motion in Water Communications.

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Presentation on theme: "Teledyne RD Instruments Leaders in Acoustic Doppler Current Profilers and Doppler Velocity Logs Measuring Water in Motion and Motion in Water Communications."— Presentation transcript:

1 Teledyne RD Instruments Leaders in Acoustic Doppler Current Profilers and Doppler Velocity Logs Measuring Water in Motion and Motion in Water Communications Technologies Bertinoro 2009

2 Measuring Waves Accurately Workhorse Waves Array ADCP Darryl Symonds Director of Marine Measurements Product Lines Teledyne RD Instruments

3 Waves Measuring Techniques 1.Pressure Sensor Array 2.Triplet Processing 3.Orbital Velocity Array

4 Pressure Sensor for Waves 1.Use a single pressure sensor to measure the change in the water surface height; provides non-directional waves data (Wave Height and Period) 2.Use an array of pressure sensors to measure the change in the water surface height at several locations at once; provides direction waves data (Wave Direction)

5 Triplet Processing for Waves Uses 3 parameters to provide waves data 1.Measure changes in the height of the water to provide non-directional waves data (Wave Height and Period) 2.Measure water velocity to provide directional waves data Techniques 1.PUV – Pressure + U/V Horizontal Velocity Vectors 2.UVW – Vertical Vel + U/V Horizontal Velocity Vectors 3.SUV – Vertical Range + U/V Horizontal Velocity Vectors

6 Orbital Velocities for Waves Measures the orbital velocities below the surface at multiple layers to provide 4-20 independent measurements of the orbital velocity created by a passing wave

7 Waves energy propagation

8 Orbital Wave Energy is flattened due to the bottom

9 Energy of short waves decays with depth

10 RDI ADCP Waves Measurements Techniques WH Sentinel Monitor ADCP NEMO WH Horizontal ADCP

11 RDI Sentinel ADCP Waves WH Sentinel Monitor ADCP Measurements: Current Profile Echo Intensity U/V Velocity Vert Velocity Pressure Surface Track

12 Triplet Processing – PUV/UVW PPP Pressure = Non Directional Wave Data: Hs, Tp UV Velocity Bin = Directional Wave Data: Dp UVW Velocity Bin = Non Directional and Directional Wave Data: Hs, Tp, Dp

13 Surface Tracking – 4 Beams 4 Beam Array = Non Directional: Hs, Tp UV Velocity Bin = Directional Wave Data: Dp

14 Orbital Waves Processing 4-20 Independent Orbital Fluctuation Sensors Directional Spectrum with IMLM

15 Data Provided by the WH Sentinel ADCP Waves System Simultaneous Currents and Waves Current Profile Information -East/North/Vertical Velocity -Error Velocity -Correlation -Echo Intensity -Percent Good

16 Data Provided by the WH Sentinel ADCP Waves System Simultaneous Currents and Waves Wave Information -Processed Parameters (Height, Period, Direction) -Non Directional Spectra (3 methods; Orbital, Surface Track, and Pressure) -Directional Spectra

17 Height, Period, Direction, Tides Time Series TIDES Peak PERIOD Peak DIRECTION Significant Wave HEIGHT

18 Non Directional Spectrum (Wave Height Spectrum) Surface Tracking Orbital Array Velocity Pressure Sensor

19 Triplet (PUV) Narrow Band Array RDI Vertical ADCP Array FrequencyNA600kHz # Sensors3312 Signal ProcessingNA Narrow Band (U/V) BroadBand Bin Size (meters)NA20.7 Measurement Precision (cm/sec) Array Aperture (m) Assumes 20 meter depth Single Point 107 Comparing Methods

20 Comparing Directional Resolution NarrowBand Array Triplet (PUV) RDI VADCP Array

21 Summary of the WH Sentinel ADCP Waves System RDI’s ADCP Wave Array provides several instruments at the same time in one package –current profiling AND –directional wave gauge AND –water level device Directional Wave Analysis –array type measurement refines direction resolution –Reveals and corrects for bias due to wave-current interaction –3 independent methods collected for comparison and quality assurance

22 RDI ADCP Waves Measurements Techniques WH Horizontal ADCP Measurements: Horizontal Current Profile Echo Intensity U/V Velocity Array Pressure

23 Orbital Waves Processing Horizontal ADCP is at a single layer below the surface Directly measures the entire wave field. Directional Spectrum with IMLM

24 Triplet (PUV) Narrow Band Array RDI Vertical ADCP Array RDI Horizontal ADCP FrequencyNA600kHz 300kHz # Sensors Signal ProcessingNANarrowBandBroadBand Bin Size (meters)NA20.78 Measurement Precision (cm/sec) Array Aperture (m) Assumes 20 meter depth Single Point Comparing Systems

25 Real Time Measurements in Ports, Navigation Channels, and Oil Platforms Improves Directional Wave Spectra Improves Long Wave Measurement Performance Lower system reduced Maintenance Cost Summary of the WH Horizontal ADCP Waves System

26 Waves Measuring Setup 1.Which Processing Method? 2.What is the Data Collection Interval? 3.What about Real Time Data Collection?

27 Orbital Velocity Array Considerations BenefitsConcerns Collect data sub surfaceMust be a fixed bottom mount Waves data information is collected near the surface Selection of proper depth cells Automatic waves depth cell selection Must ensure the pressure sensor is working correctly Collect simultaneous current profiles and waves data Power consumption for waves pinging requires more batteries Collect data at water depths 5-80m Upper cutoff frequency lowered as depth increases “Compressed” waves data allows for easier data output The waves packets are large

28 Surface Track Considerations BenefitsConcerns Collect data sub surfaceMust be a fixed bottom mount Directly measure the surface height Air bubbles and high sediment in the water column Automatic waves depth cell selection Must ensure the pressure sensor is working correctly Collect simultaneous current profiles and waves data Power consumption for waves pinging requires more batteries Collect data at water depths 10-80m Upper cutoff frequency lowered as depth increases “Compressed” waves data allows for easier data output The waves packets are large

29 UVW Considerations BenefitsConcerns Collect data sub surfaceMust be a fixed bottom mount In-directly measure the surface height High frequency changes are attenuated at depth Collect simultaneous current profiles and waves data Power consumption for waves pinging requires more batteries Collect data at water depths 10-80m Upper cutoff frequency lowered as depth increases

30 So which Method to Use? Data for all 3 methods is collected by the ADCP at the same time. Each method can be separately processed by the RDI software. Compare results if all agree then use the Orbital Velocity data If there are differences verify if the Concerns caused a bias and select the method that does not have bias

31 Currents Only Ping Setup 10min Ensemble Single Ping Ensembles Multiple Ping Ensembles Evenly Spaced in Time Multiple Ping Burst Ensembles

32 Currents Only Ensemble Setup Burst Ping Ensembles 8 Pings/Ens * 6 Ens/Hr = 48 Pings/hr Burst Ping Ensembles + Burst Ensembles 2 Pings/Ens * 24 Ens/Hr = 48 Pings/Hr 10 Min

33 Waves Sampling Strategies 10min Current Ens. Waves Burst duration is User Selectable, min/typical 20mins Pings for Current Ens. within Waves burst are shared with Wave Burst Current Ens. Are User Selectable typical 10mins (TE Cmnd) Pings for Current Ens. outside Waves burst are at User Selected Interval (TP Cmnd) Pings for Waves Burst are 2Hz

34 Waves Sampling Strategies Waves Burst interval is User Selectable: - min/typical 1 per hour - max 1 per 3 hours 10min Ens. Wave Burst

35 RDI ADCPs AND REAL TIME COMUNICATIONS

36 Real Time Data Requirement

37 RDI ADCP Real Time Waves NEMO Advantages: Remote Real Time Currents and Waves Processing Use Orbital Waves or UVW Processing Allows low data bandwidth applications Stand alone or integrated

38 SeaBird Electronics Inductive Modems Teledyne Benthos Acoustic Modems RDI Integrated Real Time Options

39 WH External Battery Case WH Sentinel w/RDI NEMO RDI WH with Integrated NEMO and Internal/External SBE IMM Integration Setup Features: All of the previous WH Powers NEMO and IMM Expandable Battery Integration for Day Deployments SBE Underwater IMM with coupler and cable mount.

40 RDI WH with External SBE IMM Integration Setup

41 Insulated mooring cable. Seawater Ground Seawater Ground Anchor Surface Buoy with Surface Modem SBE IMM Coupler RDI WH ADCP with IMM Coupler RDI WH with Internal SBE IMM Integration Setup SBE IMM Coupler RDI WH ADCP

42 RDI WH with Internal SBE IMM Integration Setup Features: WH synchronous or asynchronous with IMM Real time data access No interruption of asynchronous WH data Stored data access through IMM 16KByte Loop Recorder Powered by single WH battery for 1year; deployment duration depends on model and user setup

43 Inductive Setup Considerations Mooring Cable Diameter –Support 9.5mm(3/8”) – 19.1mm(3/4“) diameter cables –Coupler spacers supplied to limit cable motion within coupler Power Consumption –Power consumption for RDI ADCP –Power consumption for IMM data access –Plan for IMM power consumption during other sensor downloads Data Format –ASCII or Binary data –Complete data or subset

44 Contacts Main Office: Teledyne RD Instruments, Inc Stowe Drive Poway, CA Main: European Office: Teledyne RDI Europe 5 Avenue Hector Pintus La Gaude, France Main: China Office: Teledyne RD Technologies: 1206 Dongfang Road, Pu Dong Shanghai China Main: Italy Representative: Gianni Basini & Sandro Giordano Communications Technology Pzza Guidazzi 3 Cesena Italy


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