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Evaluation of Center Pivot Sprinkler Wind Drift and Evaporation Loss

机译：中心枢轴喷淋风漂流和蒸发损失评估

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摘要

Wind drift and evaporation losses (WDEL) that occur under sprinkler irrigation have been a research topic since the advent of sprinkler irrigation. Numerous research studies have reported WDEL values ranging from 0.7 to 45% of applied water. The widerange of sprinkler irrigation WDEL values reported in the literature has lead to misconceptions and confusion as to the amount of water lost to wind drift and evaporation among irrigation experts, irrigation industry personnel and the general public. Theobjective of this project was to develop and evaluate a methodology for measurement of WDEEL from center pivot sprinklers using a combination of applied water collectors, bromide tracer and air samplers. The evaluation criteria were the magnitude of water volume balance error. A methodology for measuring wind drift and evaporation loss from center pivot sprinklers was developed and field tested under limited wind speed conditions. Volume balance errors ranged from 0.1 to 7.1%. The cause for the large errors on two occasions has not yet been determined. The percent of applied water aerosolized and measured as drift was found to be linearly correlated with wind speed. Overall, the limited tests show the methodology to be feasible for measuring WDEL fromcenter pivot sprinklers. Tests in higher wind speeds are needed to validate the methodology as is determination and elimination of the cause for the high volume balance errors.
机译：喷灌发生随风漂移和蒸发损失（WDEL）已自喷灌问世一个研究课题。许多研究都报道WDEL值范围从0.7到灌溉水45％。喷灌WDEL值的较宽范围的文献报道已经导致误解和混乱，水灌溉专家，灌溉行业人员和广大公众中失去了随风漂移和蒸发量。 Theobjective此项目的是开发和评估的方法用于从使用施加的收藏家水，溴化示踪剂和空气取样的组合中心枢轴型喷头WDEEL的测量。评价标准是水量平衡误差的大小。一种用于从中心枢轴型喷头测量风漂移和蒸发损失的方法被开发和有限的风速条件下现场测试。音量均衡误差范围为0.1％〜7.1％。在两种情况下的较大误差的原因尚未确定。被发现的雾化并作为漂移测量施加水的百分比与风速线性相关。总体而言，限定测试显示的方法是用于测量WDEL fromcenter枢轴洒水喷头可行的。在较高风速测试需要验证方法为是确定和消除病因的高音量平衡的错误。

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