Parameters for Designing the Sprinkler Irrigation System under Wind Condition

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  • 風を考慮したスプリンクラ‐散水かんがい装置設計の要件
  • カゼ オ コウリョシタ スプリンクラー サンスイ カンガイ ソウチ セッケイ

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The degree of the uniformity of sprinkler irrigation in the field can be expressed by the distribution of water application rate and the uniformity coefficient. Those are important factors for planning and controlling the sprinkler irrigation system.<br>The authors proposed previously the computer calculation method for evaluating those factors being operated under practical operating conditions involving wind drift of sprays. The calculation is performed from the geometry of sprinklers arrangement, the trajectories of sprays, and the discharge profile of a single sprinkler. The input data required are those obtained from a standard sprinkler discharge profile test performed at nowind condition.<br>The following results are obtained by applying the above calculation method, The effect of the angle of wind with respect to main line axis on the uniformity coefficient is little, the effect of wind drift of sprays on the uniformity coefficient can be neglected under wind speed less than 1m/s, the effect of wind on the mutual relation between uniformity coeffient and overlapping is not observed, the shape of sprinkler discharge profile that yields the maximum value of uniformity coefficient is changed from triangular one to rectangular one as the overlapping is increased, and the arrangement that yields the greater value of uniformity coefficient is the triangular one in the range of large spacing along main line axis. As a practical example in this study, the layout of the overlapping sprinklers is designed using 60 F 3 sprinkler as that the effects of wind drift and nozzle pressure on the uniformity of the distribution of water application rate is little.<br>The data obtained by the analysis and the proposed calculation method may be very useful for planning and controlling sprinkler irrigation systems.

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