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Acoustic Doppler Current Profiler Technology

Acoustic Doppler Current Profiler Technology. December 20, 2005. Trevor Lykens, Tim Sisk, Chris Tomichek. Introduction to ADCP Technology. What is ADCP? Acoustic Doppler Current Profiler What does it measure? How does it measure? Why use an ADCP? Who uses ADCP’s?

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Acoustic Doppler Current Profiler Technology

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  1. Acoustic Doppler Current Profiler Technology December 20, 2005 Trevor Lykens, Tim Sisk, Chris Tomichek

  2. Introduction to ADCP Technology • What is ADCP? • Acoustic Doppler Current Profiler • What does it measure? • How does it measure? • Why use an ADCP? • Who uses ADCP’s? • How much does it cost? • Why did we use ADCP recently?

  3. What is an ADCP? • Acoustic Doppler Current Profiler • Works like the radar gun • Uses sound to make measurements … • SONAR (like RADAR in air) SOund NAvigation &Ranging

  4. What Does It Measure? • ADCPs measures 3F’s • How fast? … speed, velocity • Howfar?… distance, range, depth • Howfull? … volume • WHILE MOVING!!!!

  5. ADCP How Does It Measure? • Uses Beams to Measure Water in Motion

  6. Discharge / Velocity Measurement Distance = 150 ft 0.2 0.4 0.5 0.6 0.7 0.8 0.8 1.0 1.0 0.6 0.9 0.2 0.7 0.3 1.0 1.0 0.4 0.8 0.4 0.5 0.8 0.8 1.0 1.0 0.2 0.4 0.8 0.1 0.3 0.6 0.7 0.6 1.0 1.0 0.3 0.8 0.4 0.5 0.5 0.6 0.7 0.7 0.9 0.9 0.4 0.1 0.3 0.3 0.8 0.6 0.9 0.9 0.2 0.7 0.3 0.4 0.4 0.5 0.5 0.5 0.7 0.7 0.3 0.2 0.6 0.4 0.7 0.7 0.5 0.2 0.3 0.3 0.3 0.4 0.4 0.4 0.5 0.5 0.5 0.3 0.5 0.5 0.4 0.4 0.2 0.2 0.3 0.3 0.3 0.4 0.4 0.4 0.4 0.4 0.4 0.4 0.2 0.2 0.2 0.2 0.2 0.2

  7. Why Use an ADCP? • Moving Discharge / Velocity Measurement • Much faster than traditional means. Improves efficiency, saves money (one run <5 min) • Highly accurate measurements • Hundreds of readings made per pass • More measurements for peace of mind with data quality

  8. Who Uses ADCPs? • USGS • Army Corps of Engineers • State/Federal Agencies • Universities • Irrigation Districts • Defense Contractors • Consultants

  9. ADCPs… • Can measure quickly from bridges or pulley system • Avoids pitfalls of user in the water • No Maintenance cost • Save time and money in maintaining the instrument • Lower overall cost • Save time and money

  10. Applications • Measuring Discharge • Wave studies • Sediment Transport Studies • Scour and erosion studies • Bathymetry Mapping • IFIM Studies

  11. How Much Does It Cost?(RDI Instruments ADCP Cost Table Through CT Vendor) Purchase PriceRental per week $23,000 $960 $15,000 $600 $19,000 $750 • Rio Grande: Used in larger rivers and streams (1.5 ft – 225 ft). Typically mounted on boat • Stream Pro: Used in small streams and brooks (3 in – 6.5 ft) Comes with custom mount • Sentinel: Used in canals and larger rivers (Distance Varies) Permanently mounts on bottom or side

  12. Rio Grande 1200kHz Measures from 1.5-ft. to 60-ft. Most versatile unit Mounts to a boat or Trimaran Software very easy to use Very Accurate

  13. Rio Grande 600kHz Measures from 3.5-ft. to 225-ft. Mounts to a boat or Trimaran Software very easy to use Very Accurate

  14. Rio/Stream-Pro In Action

  15. ADCP: Stream-Pro • Permits more effective measurement methods in shallower depths of 4 in – 6.5 ft • Measures currents from top to bottom at the same instant – 2 in resolution or even finer • Bottom-tracking capability allows moving across stream continuously • Safer: avoids operator in the water • Convenient: wireless link permits flexible operation from shore, bridge, & cableway

  16. WinRiver Software • Setup Wizard • Depth • Boat Speed • Water Speed • Bottom Type • No Need to Memorize Commands

  17. WinRiver User Interface Screen

  18. Creates Reports

  19. Our Recent Application • ConEd – West Springfield Station in Mass. • 10 Transects across the Connecticut River • Bathymetry • Velocities • Total flow • Rented Rio-Grande 1200 kHz unit • Fabricated mount for our boat • Laptop data collection

  20. Why Did We Use ADCP Technology? • Client required by NPDES permit to perform a thermal plume study of discharge effects at West Springfield Station • Efficient means to gather bathymetric, velocity, and therefore flow data • Relatively inexpensive (see cost table)

  21. •WSS Intake •Unit 1&2 Discharge •Unit 3 Discharge •Mouth of Mill River •Sewage effluent Discharge •Mouth of Westfield River West Springfield Transects

  22. Study Results • Performed 10 transects in the CT River in <4 hrs • Calculated cumulative flow in river was within ~5% at all transects • Very rainy day with pulsing inflows • Collected data is being incorporated into Thermal Plume hydraulic modeling (John Richardson @ Blue Hill Hydraulics) • Output was simple text file • Also can have ASCII output files • Create own output reports or graphs with WinRiver • The ADCP was very User-Friendly

  23. ADCP Summary • ADCP Technology is accepted by academia, state and federal agencies, etc. • Relatively inexpensive and produces quality data • Multiple ADCP models make the technology very versatile (Resolution, Depth, etc.) • Very user-friendly software and tech support • RDI has 24/7 Telephone Support • RDI University (take classes on line for free)

  24. Questions? For more info contact Chris Tomichek, Tim Sisk, or Trevor Lykens

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