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Status Report on Bottom-Tracking ADCPs & ADPs

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harlow
36 diapositives · 486 Views · Sep 04, 2014

This report highlights the latest advancements in Acoustic Doppler Current Profilers (ADCP) and Acoustic Doppler Systems (ADP), focusing on their applications, benefits, and recent developments in the USGS’s river profiling initiatives. With over $4,100,000 in benefits, these technologies improve flow distribution measurements, reduce risks associated with debris, and offer versatile deployment options. It also addresses quality assurance/quality control efforts, future developments, and use cases for evaluating aquatic habitats and calibrating numerical models, ultimately enhancing our understanding of river dynamics.

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  1. Status Report on Bottom-Tracking ADCPs & ADPs David S. Mueller Office of Surface Water

  2. Topics for Presentation • ADCP & ADP Usage • Benefits • Applications • QA/QC Efforts • New Developments

  3. Profilers in the USGS 165 River Profilers = $4,100,000

  4. Benefits • Measures Profiles in the whole cross section • Doesn’t assume log velocity profile • Handles bidirectional flows

  5. Benefits • Less time and equipment on bridges • No lines in the water (debris risk reduced) • Multiple deployment options

  6. Typical Deployment Methods

  7. Tethered from Cableway

  8. Maine’s Bank Operated Cableway

  9. Alaska’s Seaplane

  10. Maine’s Canoe Deployment

  11. Remote Control Boat Demo

  12. SFWMD Remote Boat

  13. OceanScience R/C Boat Available Now Max. Vel. 5.5 fps

  14. Applications • Measure Flow Distribution • Evaluate Aquatic Habitat • Calibrate and Validate Numerical Models • Visualize Flow Fields • Qualitatively Assess Suspended Sediments

  15. Flow Distribution

  16. Flow Field Measurements

  17. Numerical Model Validation

  18. Sacramento River at Delta Cross Channel Courtesy of Randal Dinehart, California District Survey Grid

  19. Flow Animation

  20. Animation of Backscatter Changes

  21. QA/QC Efforts to Date • Tow Tank Tests • Marginal success due to limits of tow tanks

  22. Efforts to Date -- continued • Discharge Comparisons • Broadband tests: Morlock, 1996 • Rio Grande and RiverSurveyor tests: Mueller, 2003

  23. Sample Data

  24. Variation in Rio Grande Meas. 6 5 4 3 2 1 DEVIATION FROM MEAN OF ALL PASSES, IN PERCENT 0 -1 -2 -3 -4 -5 1.9 2.3 1.7 1.0 1.7 2.2 2.4 0.7 1.2 1.0 1.0 1 2 3 1 2 3 4 1 2 1 2 Missouri R. at Hermann, MO Mississippi R. at Chester, IL Kankakee R. at Dunns Bridge, IN Kankakee R. at Shelby, IN

  25. Variation in RiverSurveyor Meas. 12 10 8 6 4 2 DEVIATION FROM MEAN OF ALL PASSES, IN PERCENT 0 -2 -4 -6 -8 -10 4.1 3.9 3.8 3.7 5.6 5.0 5.4 1 2 3 1 2 3 4 Kankakee R. at Dunns Bridge, IN Kankakee R. at Shelby, IN

  26. Variation in Bottom Track and GPS 600 kHz Rio Grande 5 0 DEVIATION FROM MEAN OF ALL PASSES, IN PERCENT -5 0.7% 2.2% 1.2% 2.3% 1.0% 4.4% 1.0% 1.7% -10 BT GPS BT GPS GPS BT BT GPS GROUP 1 GROUP 1 GROUP 2 GROUP 2 Missouri River Mississippi River SITE AND NAVIGATION REFERENCE

  27. Summary of Results • On average, all acoustic measurements were with 5% of Price AA or rating • Higher frequency units will detect a moving bottom more often and will require use of DGPS more frequently • COV was lower for RDI instruments • COV was higher when using DGPS

  28. ADCP ADV Efforts to Date -- continued • Velocity Comparisons • Rio Grande: Gartner, 2002

  29. Current QA/QC Efforts • Rio Grande Testing • Water Mode 11 • Water Mode 12 • Bottom Mode 7 • RiverSurveyor Testing • New Software • Shallow-Water Ping • Bottom-Track Algorithms

  30. Current QA/QC Efforts • Flow Disturbance • Simple cylinder • Fully-developed flow • Approach velocity = 4 ft/s • Flow is from right to left with a y-axis cutting plane at approximately the center of the cylinder.

  31. Current QA/QC Efforts • GPS Evaluation • StreamPro Evaluation

  32. Current QA/QC Efforts • Number of Passes RD INSTRUMENTS 10 SONTEK 5 DEVIATION FROM MEAN OF ALL PASSES, IN PERCENT 0 -5 -10 8 2 4 1 6 NUMBER OF PASSES

  33. Future Developments • Phased Array Technology • 2.8 inches in diameter • 58 x 58 elements • Replaces 4 individual ceramics • Still in development

  34. Next Generation ADCP • Dual Frequency Operation – For shallow & deep rivers: • 600 kHz for accurate bottom tracking & deep water profiling • 2400 kHz for high resolution shallow water profiling • Flat face for minimum flow disturbance • 5” X 5” cylinder

  35. Next Generation Field Vehicle • Great morale builder • Great recruiting tool • No need to maintain boats • Built-in ADCP and computer

  36. ?