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

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Presentation transcript:

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

NUMUG SAIC

Wind-Speed Averages (Unobstructed) ImpactHoursA Avg.B Avg.Diff. 100-M WS M WS M WS NUMUG SAIC

Wind Directions from degrees blow through tower Window is 25 degrees for vane and cup sensors and 30 degrees for sonic sensor NUMUG SAIC

Tower Interference MODYTMA100B100A60B60A10B10WD

Tower Interference - A Data Bad MODYTMA100B100A60B60A10B10WD

Tower Interference – B Data Bad MODYTMA100B100A60B60A10B10WD

10-m Wind-Speed Averages Tower Impact ImpactHoursA Avg.B Avg.Diff. 10-M WS-A M WS-B

60-m Wind-Speed Averages Tower Impact ImpactHoursA Avg.B Avg.Diff. 60-M WS-A M WS-B NUMUG SAIC

100-m Wind-Speed Averages Tower Impact ImpactHoursA Avg.B Avg.Diff. 100-M WS-A M WS-B NUMUG SAIC

Wind-Direction Averages (Unobstructed) ImpactHoursA Avg.B Avg.Diff. 100-M WD M WD M WD NUMUG SAIC

10-m Wind-Direction Averages Tower Impact ImpactHoursA Avg.B Avg.Diff. 10-M WD-A M WD-B NUMUG SAIC

100-m Wind-Direction Averages Tower Impact ImpactHoursA Avg.B Avg.Diff. 100-M WD-A M WD-B NUMUG SAIC

Electric Boxes at Sensor height NUMUG SAIC

Pole Interference with Wind Speed NUMUG SAIC

Pole NUMUG SAIC

Antenna and Associated Conduit Interference with Wind Speed NUMUG SAIC

YearTotal Hours Freq. (%) A System (mph) B System (mph) Diff. (mph) Average Wind Speed from Totally Unobstructed Directions (180°-230°) NUMUG SAIC

YearTotal Hours Freq. (%) A System (mph) B System (mph) Diff. (mph) Average Wind Speed Blowing Through Conduit to System A Sensor (355°-010°) with System B Sensor Unobstructed NUMUG SAIC

YearTotal Hours Freq. (%) A System (mph) B System (mph) Diff. (mph) Average Wind Speed Blowing Through West Antenna to System A Sensor (345°-355°) with System B Sensor Unobstructed NUMUG SAIC

YearTotal Hours Freq. (%) A System (mph) B System (mph) Diff. (mph) Average Wind Speed Blowing Through West Antenna and Conduit to System B Sensor (010°- 025°) with System A Sensor Obstructed by Tower NUMUG SAIC

YearTotal Hours Freq. (%) A System (mph) B System (mph) Diff. (mph) Average Wind Speed Blowing Through South Antenna to System A Sensor (040°-060°) with System B Sensor Obstructed by Tower NUMUG SAIC

YearTotal Hours Freq. (%) A System (mph) B System (mph) Diff. (mph) Average Wind Speed Blowing Through South Antenna to System B Sensor (065°-085°) with System A Sensor Unobstructed NUMUG SAIC

Tower Interference with No Additional Equipment and Limited Conduit Dedicated Met Tower Concept NUMUG SAIC

Wind-Speed Averages – A System in Tower Wake ImpactHoursA Avg.B Avg.Diff. 10-M WS M WS M WS NUMUG SAIC

Wind-Speed Averages – B System in Tower Wake ImpactHoursA Avg.B Avg.Diff. 10-M WS M WS M WS NUMUG SAIC

What Caused 100-Meter Impact of 1.3 MPH? Close Review of data indicated almost 3 mph difference with wind directions from 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

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

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