DETERMINING THE MINIMUM MANAGEMENT SCALE OF A COMMERCIAL VARIABLE-RATE IRRIGATION SYSTEM
DETERMINING THE MINIMUM MANAGEMENT SCALE OF A COMMERCIAL VARIABLE-RATE IRRIGATION SYSTEM
复制标题
确定商业可变流量灌溉系统的最低管理规模
DOI：
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发表时间：
2016
期刊：
影响因子：
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通讯作者：
C. Hillyer
中科院分区：
文献类型：
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作者：
C. Higgins;J. Kelley;Colleen Barr;C. Hillyer
变量灌溉（VRI）是一种可以提高配水精度的技术，允许应用与田间条件的变化相匹配。理想情况下，VRI可以根据土壤含水量、作物蒸散量和渗透率的要求，灌溉小面积（≥ 100 m 2）的管理区域。在田间条件下，实现理想的处方水的应用是阻碍了机械限制，表面重新分布，风漂移的混杂效应。本研究采用的数据从一个二维阵列的440个集罐测量应用程序从多尺度灌溉处方。为了评价VRI设备的有效性，在传统均匀性系数的基础上提出了一种新的性能系数。初步分析表明，平均施水量不足约7%，规定水深和测量水深之间的最大差异发生在规定过渡区域附近。过渡区进行了更详细的分析，并确定了一个特征的长度尺度（Ifos）的过渡区通过分散类比。量表的分析表明，Icentin是独立的应用程序的深度，沿着枢轴的位置，或枢轴的方向。这表明，传统的，单线捕捉-可以测试可以提供足够的信息来确定长度尺度。长度尺度用于确定最小独立管理区的大小;最小管理区大小确定为5.6米（调查中的枢轴为23米）。
Variable-rate irrigation (VRI) is a technology that can improve the precision of water distribution, allowing application to be matched to the variability of field conditions. Ideally, VRI can irrigate small (≥100 m 2 ) management areas as required by soil water content, crop ET, and infiltration rate. Under field conditions, achieving the ideal prescription for water application is hampered by confounding effects of mechanical limitations, surface redistribution, and wind drift. This study employed data from a two-dimensional array of 440 catch-cans measuring application from a multi-scale irrigation prescription. To evaluate the effectiveness of the VRI equipment, a new performance coefficient was developed based on the traditional uniformity coefficient. Initial analysis showed that there was an average under-application of water by ~7%, and the most significant disparity between the prescribed and measured water depths occurred near areas of transition in the prescription. Areas of transition were analyzed in more detail, and a characteristic length scale (Iƒ) of the transition zones was identified through a dispersion analogy. Analysis of the scale showed that Iƒ was independent of application depth, position along the pivot, or orientation of the pivot. This indicated that a traditional, single line catch-can test can provide sufficient information for determination of the length scale. The length scale was used to determine the size of the smallest independent management zone; the minimum management zone size was determined to be 5.6Iƒ (23 m for the pivot under investigation).