The objective of this study was to assess the different scenarios for improving the irrigation application efficiency of a two‐row bed furrow irrigation system (wide furrow) using the SIRMOD model in six sugar beet fields of the Moghan plain for the 2015–2016 growing season. The Moghan plain is situated in the Ardebil province of Iran. Therefore, five scenarios including: (i) irrigation cut‐off time equal to the advance time (ICTEAT); (ii) cutting off the flow discharge before it reaches the end (CTIBRE); (iii) increasing the flow discharge up to 2.5 l s¯¹ and cutting it off when the irrigation requirement is fulfilled (IARCSI); (iv) increasing inflow discharge up to 2.5 l s¯¹ and cutting off the flow discharge as soon as the advance phase reaches the end (IARCARE); (v) reducing inflow rate, cut‐off time and furrow length (100 m in all the furrows) by blocking the end of the furrow (RICTLBE), were applied using the calibrated SIRMOD model. In addition, surge irrigation was carried out in fields with high percolation. The results indicated that the average irrigation application efficiency under the current status was 35%. However, average application efficiencies increased to 63, 74, 59, 60 and 77% in the ICTEAT, CTIBRE, IARSCI, IARCARE and RICTLBE scenarios, respectively. The application efficiency for fields with high percolation increased from 32%, in the current status, to 53, 64, 62, 60, 78 and 76% under ICTEAT, CTIBRE, IARSCI, IARCARE, RICTLBE and surge irrigation, respectively. Overall, the irrigation management scenarios could substantially reduce on‐farm irrigation water losses.

中文翻译：

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使用模拟模型改善伊朗莫汉平原犁沟灌溉系统的性能*

这项研究的目的是使用SIRMOD模型评估莫甘平原六个甜菜田2015–2016年生长期的两行床犁沟灌溉系统（宽沟）的灌溉应用效率，以评估不同的应用场景。 。莫汉平原位于伊朗的Ardebil省。因此，有五种情况，包括：（i）灌溉截止时间等于提前时间（ ICTEAT）；（ii）在流量排放到达终点之前将其切断（CTIBRE）；（iii）将流量增加至2.5ls¹，并在满足灌溉要求时将其切断（IARCSI）；（iv）将流入流量增加到2.5ls¹，并在提前阶段结束时立即切断流量（IARCARE）；（v）通过使用校准的SIRMOD模型，通过阻塞犁沟的末端（RICTLBE）来减少流入量，截止时间和犁沟长度（所有犁沟均为100 m）。另外，在高渗滤田中进行了涌灌。结果表明，当前状态下平均灌溉应用效率为35％。但是，在ICTEAT，CTIBRE，IARSCI，IARCARE和RICTLBE方案中，平均应用效率分别提高到63％，74％，59％，60％和77％。在ICTEAT，CTIBRE，IARSCI，IARCARE，RICTLBE和涌浪灌溉下，高渗滤领域的应用效率从目前的32％分别提高到53％，64％，62％，60％，78％和76％。总体而言，灌溉管理方案可以大大减少农田灌溉水的损失。