| Popis: |
THE model presented in Part I of this paper paper was found to accurately predict droplet evaporation while predictions of total spray evaporation were reasonably good except when water temperatures were high. Predictions of air temperature and vapor density profiles 15 and 30 m downwind of the sprinkler were within 10% of measured values for the wind speeds considered (up to 5.64 m/s) but could not be thoroughly evaluated. A sensitivity analysis indicated that spray evaporation was very sensitive to droplet size, and moderately sensitive to relative humidity and sprinkler mounting height. Wind speed had an important effect on spray evaporation when droplets were very small and/or sprinklers were mounted high above the ground surface. The model predicted that spray evaporation was as sensitive to water temperature as to droplet size. This result was questioned since agreement between predicted and measured spray evaporation for high water temperatures was not good. Downwind microclimate was less sensitive than spray evaporation to changes in wind speed, upwind air temperature and relative humidity, droplet size, sprinkler mounting height, and water temperature |
