Skip to main content

Comparison of sprinkler droplet size and velocity measurements using a laser precipitation meter and photographic method

King, B.A. and Winward, T.W. and Bjorneberg, D.L. (2013) Comparison of sprinkler droplet size and velocity measurements using a laser precipitation meter and photographic method. pp. 1-13. In: 2013 ASABE Annual International Meeting. Kansas City, Missouri, July 21-24, 2013. 13 pp.

[img] PDF
1533.pdf

Download (339kB)

Abstract

Kinetic energy of water droplets has a substantial effect on development of a soil surface seal and infiltration rate of bare soil. Methods for measuring sprinkler droplet size and velocity needed to calculate droplet kinetic energy have been developed and tested over the past 50 years, each with advantages, disadvantages, and limitations. A laser precipitation meter and photographic method were used to measure droplet size and velocity from an impact sprinkler at three pressures and one nozzle size. Significant differences in cumulative volume drop size distributions derived from the two measurement methods were found, especially at the highest operating pressure. Significant differences in droplet velocities were found between measurement methods as well. Significant differences were attributed to differences in minimum drop sizes measured; 0.5mm for the photographic method versus 0.2 mm for the laser precipitation meter. The laser precipitation meter provided smaller cumulative volume drop size distributions compared to the photographic measurement method. The laser precipitation meter tended to provide greater drop velocities which were attributed to altitude differences at experimental sites. The difference in calculated droplet kinetic energy per unit volume based on drop and size velocity data from the laser precipitation meter and the photographic method ranged from +12.5 to -28%. The laser precipitation meter generally provided a lower estimate of sprinkler kinetic energy due to the measurement of a greater proportion of smaller drop sizes. Either method can be used to obtain drop size and velocity sprinkler drops needed to calculate sprinkler kinetic energy. The laser precipitation meter requires less skill and labor to measure drop size and velocity.

Item Type: Conference or Workshop Item (Paper)
NWISRL Publication Number: 1533
Subjects: Irrigation > Sprinkler irrigation
Soil > Soil water (soil moisture)
Water > Water management
Depositing User: Dan Stieneke
Date Deposited: 17 Dec 2014 22:49
Last Modified: 17 Dec 2014 22:49
Item ID: 1577
URI: https://eprints.nwisrl.ars.usda.gov/id/eprint/1577