State Key Laboratory of Hydrology-Water Resources and Hydraulic Engineering, Hohai University, Nanjing, China.
College of Agricultural Engineering, Hohai University, Nanjing, China.
PLoS One. 2020 May 6;15(5):e0232751. doi: 10.1371/journal.pone.0232751. eCollection 2020.
Insufficient water resources restrict wheat production in the North China Plain, so it is urgent and essential to improve the border irrigation performance and water use efficiency. This study developed a predesigned varied-discharge irrigation scheme in the closed-ended border. Field treatments, including continuous-discharge (CD), increased-discharge (ID) and decreased-discharge (DD) border irrigation tests, were conducted to evaluate the irrigation performance of the proposed varied-discharge scheme. The DD border irrigation treatment had great application efficiency (AE), distribution uniformity (DU) and requirement efficiency (RE), and its comprehensive evaluation indicator (Y) was also significantly higher than other treatments. DD treatment achieved the average AE, DU, RE and Y values of 91.4%, 95.5%, 99.5% and 95.4%, respectively. Furthermore, the hydraulic simulation model WinSRFR was used to optimize the scheme of predesigned varied-discharge border irrigation, and sensitivity analyses of infiltration parameters, roughness coefficient, slope and inflow rate were carried out. The results indicate that the predesigned varied-discharge border irrigation scheme can improve the irrigation performance, and the DD border irrigation scheme has more satisfactory robustness than that of the ID border irrigation scheme.
华北平原水资源不足，严重限制了小麦生产，因此提高畦灌边界性能和水利用效率迫在眉睫。本研究在封闭式畦田设计了一种预定变流量畦灌方案。开展了连续放水（CD）、增量放水（ID）和减量放水（DD）畦灌试验，以评估所提出的变流量方案的灌溉性能。DD 畦灌处理具有较高的灌溉均匀度、需求效率和综合评价指标，其平均灌溉均匀度、需求效率和综合评价指标分别为 91.4%、99.5%和 95.4%。此外，利用 WinSRFR 水力模拟模型对预定变流量畦灌方案进行了优化，并对入渗参数、糙率系数、坡度和入流率进行了敏感性分析。结果表明，预定变流量畦灌方案可以提高灌溉性能，DD 畦灌方案比 ID 畦灌方案具有更令人满意的鲁棒性。
