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Numerical analysis and optimization of triggered furrow irrigation system
Irrigation Science ( IF 3 ) Pub Date : 2020-03-26 , DOI: 10.1007/s00271-020-00672-5
Seyed Mohammadreza Naghedifar , Ali Naghi Ziaei , Hossein Ansari

Numerical methods have been proved to be useful tools for understanding different phenomena. In this paper, triggered furrow irrigation has been analyzed by means of numerical modeling. To this end, a special code is developed for simulation of triggered furrow irrigation system by coupling three-dimensional Richards’ equation and one-dimensional fully hydrodynamic form of Saint-Venant equations. The coordinate transformation technique was used for solving Richards’ equation that improves flexibility of model for simulation of water flow in irregularly shaped furrows. Furthermore, overland flow module benefits from high-resolution total variation diminishing scheme that avoids artificial oscillations commonly occurring on the advance water front. The code was validated against different analytical, numerical and experimental benchmarks. In all cases, the accuracy of model was acceptable. The code was subsequently employed to simulate all phases of triggered furrow irrigation system (including advance and redistribution phases) on a field cultivated with wheat. Finally, Taguchi technique was employed to deduct proposals to optimize performance of triggered furrow irrigation system in terms of sensor position, triggering and cutoff thresholds and inflow rate. It was concluded that optimal performance of triggered irrigation system was obtained when the water content sensor was installed close to the furrow, providing that triggering and cutoff thresholds were set as − 15 and − 3 m (close to field capacity) and inflow rate was 1 L s −1 .

中文翻译:

触发式沟灌系统数值分析与优化

数值方法已被证明是理解不同现象的有用工具。在本文中,通过数值模拟分析了触发式沟灌。为此,通过耦合三维Richards方程和一维全流体动力学形式的Saint-Venant方程,开发了一种用于模拟触发沟灌溉系统的专用代码。坐标变换技术用于求解理查兹方程,提高了模型的灵活性,用于模拟不规则形状的沟渠中的水流。此外,地表流模块受益于高分辨率的总变差减少方案,该方案避免了通常发生在超前水前沿的人为振荡。该代码针对不同的分析、数值和实验基准进行了验证。在所有情况下,模型的准确性是可以接受的。该代码随后用于模拟小麦种植田上触发式沟灌系统的所有阶段(包括提前和重新分配阶段)。最后,采用田口技术推导出优化触发式沟灌系统在传感器位置、触发和截止阈值以及流入速率方面的性能的建议。得出的结论是,当含水量传感器安装在靠近犁沟的位置时,触发灌溉系统的最佳性能,前提是触发和截止阈值设置为 - 15 和 - 3 m(接近田间容量)并且流入速度为 1 L s -1 。该代码随后用于模拟小麦种植田上触发式沟灌系统的所有阶段(包括提前和重新分配阶段)。最后,采用田口技术推导出优化触发式沟灌系统在传感器位置、触发和截止阈值以及流入速率方面的性能的建议。得出的结论是,当含水量传感器安装在靠近犁沟的位置时,触发灌溉系统的最佳性能,前提是触发和截止阈值设置为 - 15 和 - 3 m(接近田间容量)并且流入速度为 1 L s -1 。该代码随后用于模拟小麦种植田上触发式沟灌系统的所有阶段(包括提前和重新分配阶段)。最后,采用田口技术推导出优化触发式沟灌系统在传感器位置、触发和截止阈值以及流入速率方面的性能的建议。得出的结论是,当含水量传感器安装在靠近犁沟的位置时,触发灌溉系统的最佳性能,前提是触发和截止阈值设置为 - 15 和 - 3 m(接近田间容量)并且流入速度为 1 L s -1 。田口技术被用来推导出优化触发式沟灌系统在传感器位置、触发和截止阈值以及流入速率方面的性能的建议。得出的结论是,当含水量传感器安装在靠近犁沟的位置时,触发灌溉系统的最佳性能,前提是触发和截止阈值设置为 - 15 和 - 3 m(接近田间容量)并且流入速度为 1 L s -1 。田口技术被用来推断优化触发式沟灌系统在传感器位置、触发和截止阈值以及流入速率方面的性能的建议。得出的结论是,当含水量传感器安装在靠近犁沟的位置时,触发灌溉系统的最佳性能,前提是触发和截止阈值设置为 - 15 和 - 3 m(接近田间容量)并且流入速度为 1 L s -1 。
更新日期:2020-03-26
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