Water application uniformity is an important performance parameter when designing and operating an irrigation system. Performance tests of a center pivot irrigation system equipped with fixed and rotated spray plate sprinklers (FSPS and RSPS, respectively) were conducted at five travel speeds. The effects of travel speed, collector size, and setting height on water application uniformity were evaluated using Heermann and Hein’s coefficient of uniformity (CUH). The CUH was 12.7% higher for the RSPS than the FSPS and decreased as the travel speed increased. Collector size and setting height affected CUH, and CUH was higher when the collector had a large opening cross-section compared to the collector with a small opening cross-section. CUH was higher when the collector with a low setting height compared to when it a high setting height for the FSPS. However, collector setting height had no effect on CUH for the RSPS. The weighted average water application depth (Dw) decreased as the travel speed increased. Collector size had no significant effect on Dw, but Dw with a low collector setting height was larger than the values with a high collector setting height. The water application rate increased as distance from the pivot point increased and was higher for the FSPS than the RSPS. The results will improve the selection of travel speed and collector when the water application uniformity of a center pivot irrigation system is evaluated.

中文翻译：

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行进速度和集水器对中枢灌溉系统施水均匀性评价的影响

在设计和操作灌溉系统时，施水均匀性是一个重要的性能参数。配备固定和旋转喷洒板喷头（分别为 FSPS 和 RSPS）的中心枢轴灌溉系统的性能测试在五种行驶速度下进行。使用 Heermann 和 Hein 的均匀系数 (CUH) 评估行驶速度、收集器尺寸和设置高度对施水均匀性的影响。RSPS 的 CUH 比 FSPS 高 12.7%，并且随着行驶速度的增加而降低。集热器尺寸和设置高度会影响 CUH，当集热器具有大开口横截面时，与小开口横截面的集热器相比，CUH 更高。与 FSPS 的高设置高度相比，低设置高度的集热器的 CUH 更高。然而，收集器设置高度对 RSPS 的 CUH 没有影响。随着行进速度的增加，加权平均施水深度（Dw）减小。集电极尺寸对 Dw 没有显着影响，但集电极设置高度低的 Dw 值大于集电极设置高度高的值。水的施用率随着与枢轴点的距离的增加而增加，FSPS 的水施用率高于 RSPS。在评估中心枢轴灌溉系统的施水均匀性时，结果将改进行进速度和收集器的选择。但集电极设置高度低的 Dw 大于集电极设置高度高的值。水的施用率随着与枢轴点的距离的增加而增加，FSPS 的水施用率高于 RSPS。在评估中心枢轴灌溉系统的施水均匀性时，结果将改进行进速度和收集器的选择。但集电极设置高度低的 Dw 大于集电极设置高度高的值。水的施用率随着与枢轴点的距离的增加而增加，FSPS 的水施用率高于 RSPS。在评估中心枢轴灌溉系统的施水均匀性时，结果将改进行进速度和收集器的选择。