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The Surprising Impact Stuff on the Tower has on Meteorological Data

The Surprising Impact Stuff on the Tower has on Meteorological Data. NUMUG Meeting Chicago June 2011 Jim Holian, SAIC. NUMUG SAIC. Tower, Conduit, and Equipment Impacts on Wind Speed and Direction.

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The Surprising Impact Stuff on the Tower has on Meteorological Data

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  1. The Surprising Impact Stuff on the Tower has on Meteorological Data NUMUG Meeting Chicago June 2011 Jim Holian, SAIC

  2. NUMUG SAIC Tower, Conduit, and Equipment Impacts on Wind Speed and Direction

  3. NUMUG SAIC

  4. NUMUG SAIC

  5. NUMUG SAIC

  6. NUMUG SAIC

  7. Wind-Speed Averages (Unobstructed) NUMUG SAIC

  8. NUMUG SAIC • Wind Directions from 195-245 degrees blow through tower • Window is 25 degrees for vane and cup sensors and 30 degrees for sonic sensor

  9. Tower Interference

  10. Tower Interference - A Data Bad

  11. Tower Interference – B Data Bad

  12. 10-m Wind-Speed AveragesTower Impact

  13. 60-m Wind-Speed AveragesTower Impact NUMUG SAIC

  14. 100-m Wind-Speed AveragesTower Impact NUMUG SAIC

  15. Wind-Direction Averages (Unobstructed) NUMUG SAIC

  16. 10-m Wind-Direction AveragesTower Impact NUMUG SAIC

  17. 100-m Wind-Direction AveragesTower Impact NUMUG SAIC

  18. Electric Boxes at Sensor height NUMUG SAIC

  19. NUMUG SAIC

  20. Pole Interference with Wind Speed NUMUG SAIC

  21. Pole NUMUG SAIC

  22. Antenna and Associated Conduit Interference with Wind Speed NUMUG SAIC

  23. NUMUG SAIC

  24. NUMUG SAIC

  25. NUMUG SAIC

  26. NUMUG SAIC

  27. NUMUG SAIC

  28. NUMUG SAIC

  29. Average Wind Speed from Totally Unobstructed Directions (180°-230°) NUMUG SAIC

  30. NUMUG SAIC

  31. Average Wind Speed Blowing Through Conduit to System A Sensor (355°-010°) with System B Sensor Unobstructed NUMUG SAIC

  32. NUMUG SAIC

  33. Average Wind Speed Blowing Through West Antenna to System A Sensor (345°-355°) with System B Sensor Unobstructed NUMUG SAIC

  34. NUMUG SAIC

  35. Average Wind Speed Blowing Through West Antenna and Conduit to System B Sensor (010°-025°) with System A Sensor Obstructed by Tower NUMUG SAIC

  36. NUMUG SAIC

  37. Average Wind Speed Blowing Through South Antenna to System A Sensor (040°-060°) with System B Sensor Obstructed by Tower NUMUG SAIC

  38. NUMUG SAIC

  39. Average Wind Speed Blowing Through South Antenna to System B Sensor (065°-085°) with System A Sensor Unobstructed NUMUG SAIC

  40. Tower Interference with No Additional Equipment and Limited ConduitDedicated Met Tower Concept NUMUG SAIC

  41. NUMUG SAIC

  42. NUMUG SAIC

  43. NUMUG SAIC

  44. Wind-Speed Averages – A System in Tower Wake NUMUG SAIC

  45. Wind-Speed Averages – B System in Tower Wake NUMUG SAIC

  46. What Caused 100-Meter Impact of 1.3 MPH? • Close Review of data indicated almost 3 mph difference with wind directions from 339-347 degrees.. • This accounted for nearly all of the difference at the 100-meter level. • Large Beacon Light is on north tower leg at top of tower. NUMUG SAIC

  47. Conclusions • Tower wake, equipment, and conduit have no measurable impact on wind direction. • Greatest impact is on wind speed. Differences up to 10 mph seen at wind speeds above 20 mph. • Obstructions such as antennas, beacons, and associated conduit have measurable impacts. NUMUG SAIC

  48. Conclusions (cont’d) • Dedicated meteorological towers have significantly less equipment and conduit and therefore have less interference. • Having dual systems on separate faces of the tower appears to minimize wake effects due to spreading out of conduit, bracing, etc • The data suggests that the sonic sensors may be influenced less by tower wake – not convinced. NUMUG SAIC

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