Measuring Sub-Second Wind Velocity Changes at One Meter above the Ground Hanna, H. Mark Darr, Matthew Hoff, Steven Hoff, Steven Steward, Brian Steward, Brian
dc.contributor.department Agricultural and Biosystems Engineering 2018-02-17T19:04:21.000 2020-06-29T22:34:39Z 2020-06-29T22:34:39Z 2016-07-22 2016-01-01
dc.description.abstract <p>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.</p>
dc.description.comments <p>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.</p>
dc.format.mimetype application/pdf
dc.identifier archive/
dc.identifier.articleid 1486
dc.identifier.contextkey 8870713
dc.identifier.s3bucket isulib-bepress-aws-west
dc.identifier.submissionpath abe_eng_conf/474
dc.language.iso en
dc.source.bitstream archive/|||Sat Jan 15 00:25:47 UTC 2022
dc.source.uri 10.13031/aim.20162461726
dc.subject.disciplines Agriculture
dc.subject.disciplines Bioresource and Agricultural Engineering
dc.subject.keywords Sprayers
dc.subject.keywords Spray drive
dc.subject.keywords Data collection
dc.subject.keywords Wind effects
dc.subject.keywords Turbulence
dc.subject.keywords Simulation parameters
dc.title Measuring Sub-Second Wind Velocity Changes at One Meter above the Ground
dc.type article
dc.type.genre conference
dspace.entity.type Publication
relation.isAuthorOfPublication 732298de-2ea9-4502-8fcf-3418080016e1
relation.isAuthorOfPublication 25d24836-9259-4619-a6e1-971f2049e041
relation.isAuthorOfPublication 98b46d48-66a2-4458-9b42-8c4aa050664d
relation.isAuthorOfPublication ef71fa01-eb3e-4e29-ade7-bcb38f2968b0
relation.isOrgUnitOfPublication 8eb24241-0d92-4baf-ae75-08f716d30801
Original bundle
Now showing 1 - 1 of 1
No Thumbnail Available
378.95 KB
Adobe Portable Document Format