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首页> 外文期刊>Turkish Journal of Agriculture & Forestry >Water Application Uniformity of a Subsurface Drip Irrigation System at Various Operating Pressures and Tape Lengths
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Water Application Uniformity of a Subsurface Drip Irrigation System at Various Operating Pressures and Tape Lengths

机译：地下滴灌系统在各种工作压力和胶带长度下的水均匀度

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Subsurface irrigation has been the focus of attention mainly because of its low evaporation rate and deep percolation losses. Uniformity of water applications and its stability, however, are still a matter of controversy and deserve more investigation. An experiment was conducted at the research station of Tabriz University to evaluate discharge variation among emitters and uniformity after 3 years of operation at different pressures, as well as to determine the optimum length for irrigation tapes. Four hydraulic pressures, 50, 90, 150, and 200 kPa, 4 irrigation tapes 34 m long (used tape) installed at a depth of 10 cm, and 5 new irrigation tapes (unused) 34, 50, 80, 100, and 120 m long comprised the experimental treatments. The used tapes were chosen from a subsurface irrigation system that operated for 3 years for onion irrigation. The new tapes (unused) were the same as the used ones and were laid on the soil surface during the experiment. Emitter discharge and pressure were measured every 2 m along both the used and unused tapes at the above mentioned operating pressures, and data were analyzed to compute several uniformity criteria using traditional and ASAE EP458 methods. In both used and unused tapes, emitter performance (Vpf) at 150 kPa was better than at 50, 90, and 200 kPa. The maximum uniformity coefficient (UC) values of the unused and used tapes 34 m long were 96.9% and 91.8%, respectively. Considering the variation in UC with tape length and an engineering approach toward the performance of the system for used tape, the 80-m length was determined as a suitable length for irrigation tape. The result indicated that both traditional and ASAE methods are suitable for the evaluation of subsurface drip irrigation systems. The ASAE method, however, showed slightly lower uniformity in both unused and used tapes (1.6% and 3.65%, respectively).
机译：地下灌溉一直是关注的焦点，这主要是因为其蒸发速率低和渗滤损失大。然而，用水的均匀性及其稳定性仍然是一个有争议的问题，值得进一步研究。在大不里士大学研究站进行了一项实验，以评估在不同压力下运行3年后，各排放源之间的排放变化和均匀性，以及确定灌溉带的最佳长度。四个液压，分别为50、90、150和200 kPa，在10 cm深度处安装了4条34 m长的灌溉带（用过的带），以及5条新的34、50、80、100和120用过的灌溉带（未使用）。我长期以来一直从事实验治疗。用过的胶带是从地下灌溉系统中选择的，该系统运行了3年用于洋葱灌溉。新带（未使用）与用过的带相同，并在实验过程中放在土壤表面。在上述工作压力下，每隔2 m沿已使用和未使用的胶带测量发射器的排放量和压力，并使用传统方法和ASAE EP458方法分析数据以计算多个均匀性标准。在使用过的和未使用的磁带中，发射器性能（Vpf）在150 kPa时都比在50、90和200 kPa时好。 34 m长的未使用和已使用的磁带的最大均匀系数（UC）值分别为96.9％和91.8％。考虑到UC随胶带长度的变化以及针对使用过的胶带的系统性能的工程方法，将80米长确定为灌溉胶带的合适长度。结果表明，传统方法和ASAE方法均适用于地下滴灌系统的评估。但是，ASAE方法在未使用和已使用的磁带中均显示出较低的均匀性（分别为1.6％和3.65％）。

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