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- 저자 : 가마자신토빈센트필립 ( Jacinto Vicente Filipe Gama ) (검색결과 1 건)
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가마자신토빈센트필립 ( Jacinto Vicente Filipe Gama ),홍성구 ( Seonggu Hong ) 한국농공학회 2020 한국농공학회 학술대회초록집 Vol.2020 No.-
Inadequate information about sprinklers especially in terms of coefficient uniformity and distribution uniformity is usually not given by the manufacturers, thus engineers are gettng into difficulty in correctly selecting appropriate sprinkler systems. The manufacturers provide the sprinkler specifications (throw or wetted radius of nozzle for different pressure, discharge volume, and precipitation for each nozzle). The main goal of this study is to evaluate water distribution uniformity, coefficient uniformity, and water application rates of a sprinkler system. The single sprinkler nozzl, HE-VAN of Rain bird<sup>TM</sup> 15 series was evaluated through a set of experiments. The pressure is one of the most important factors that strongly affect irrigation uniformity and efficiency in a sprinkler irrigation system. The sprinklers were operated under different pressure and nozzle angle as recommended by the manufacture. The water depths were measured using catch cans which are located from the nozzle to the wetted radius for different pressures (1, 1.4, 1.7, and 2.1 bars) for 15 minutes. The results showed changes in both distribution coefficient and the coefficient of uniformity. The lowest coefficient uniformity (CU) and (DU) on nozzle 360°for the pressures 1.7 bar were 52% and 22%, respectively. The highest value of CU and DU were 70% and 34%, respectively at 1.4 bar. At the spray angles of 360°and 270°, higher water depth near to the nozzle and th depths decreased sharply along with the distance from the sprinkler. Meanwhile at the angles of 90°and 180°, higher water depths were located at 1.3 meters from the nozzle and then decreased at end of wetted radius. Wind influence affected distribution uniformity and coefficient uniformity. The results showed that irrigation engineers should take into serious consideration of the changes in the uniformity of water distribution by different pressures in designing and installation to achieve efficient irrigation.
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