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Presentation
Measuring Sub-Second Wind Velocity Changes at One Meter above the Ground
Agricultural and Biosystems Engineering Conference Proceedings and Presentations
  • Matthew W. Schramm, Iowa State University
  • H. Mark Hanna, Iowa State University
  • Matthew J. Darr, Iowa State University
  • Steven J. Hoff, Iowa State University
  • Brian L. Steward, Iowa State University
Document Type
Conference Proceeding
Publication Version
Published Version
Publication Date
1-1-2016
DOI
10.13031/aim.20162461726
Conference Title
2016 ASABE Annual International Meeting
Conference Date
July 17–20, 2016
Abstract

Agricultural spray drift is affected by many factors including current weather conditions, topography of the surrounding area, fluid properties at the nozzle, and the height at which the spray is released. During the late spring/summer spray seasons of 2014 and 2015, wind direction, speed, and solar radiation (2014 only) were measured at 10 Hz, one meter above the ground to simulate conditions that are present for a droplet. Measurements of wind velocity as the wind passed from an upwind sensor to a downwind sensor were used to evaluate under what conditions wind may be most likely to have a significant direction or speed change which affects droplet trajectory. For two individual datasets in which the average wind speed was 3.6 m/s and 1.5 m/s, it was found that there existed little linear correlation of wind speed or wind direction between an upwind and downwind anemometer separated by 30.5 meters (100 ft). The highest observed correlation, resulting from a 12 second lag between the upwind and downwind datasets, was 0.29 where the average wind speed was 3.6 m/s. Correlations were only found for wind speeds exceeding 3 m/s. Using this lag time, it was observed that the wind direction 30 seconds into the future had a 30% chance to be different by more than 20 degrees from current conditions. While a wind speed difference of more than 1 m/s from current conditions (mean wind speed was 3.6 m/s) happened about 50% of the time. Looking at 2014 and 2015 spray season data, it was found that the most variability occurred with wind speeds below 2 m/s.

Comments

This paper appeared in 2016 ASABE Annual International Meeting, Paper No. 162461726, pages 1-15 (doi: 10.13031/aim.20162461726). St. Joseph, Mich.: ASABE.. Posted with permission.

Language
en
File Format
application/pdf
Citation Information
Matthew W. Schramm, H. Mark Hanna, Matthew J. Darr, Steven J. Hoff, et al.. "Measuring Sub-Second Wind Velocity Changes at One Meter above the Ground" Orlando, FL, United States(2016)
Available at: http://works.bepress.com/mark_hanna/161/