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本文提出了长畦分段灌溉法的一种设计模型。它是根据水量平衡原理、考虑相邻灌水段水流可以相互迭加、同时采用畦灌水流运动的普遍理论而建立的。根据模型的两种具体边界条件(水平畦和单向推进)提出了进水口间距的确定方法,包括解析法、图解法和电子计算机解法。试验结果表明,这个模型对长畦分段灌溉的设计是有效的且简便实用。可以使长畦分段灌溉准确实现定额灌溉,特别是小于35立米/亩的低定额灌溉,灌溉水分布均匀度、田间水利用率及灌溉水贮存率均超过80—85％,并随畦长而增加,比畦灌省水40—60％,灌溉效率可以提高一倍。文中还讨论了模型设计参数的确定、长畦分段灌溉法配合作物间作套种的增产作用等问题。
In this paper, a design model for long-span irrigation is proposed. It is based on the principle of water balance, consider the adjacent irrigation section water flow can be superimposed on each other, while using the general theory of flow irrigation and irrigation established. According to two specific boundary conditions of the model (horizontal 畦 and unidirectional propulsion), a method to determine the water inlet spacing is proposed, including analytic method, graphic method and electronic computer method. The experimental results show that this model is effective and easy to use for the design of the long section of subsea irrigation. It can make the fixed-section irrigation for the long-sectioned irrigation accurately, especially the low-fixed irrigation less than 35m3 / mu, the uniformity of the irrigation water distribution, the field water utilization rate and the irrigation water storage rate all exceed 80-85% The increase of 40-60% compared with irrigation water, irrigation efficiency can be doubled. The article also discusses the design parameters of the model to determine the long 畦 subsection irrigation with intercropping crop intercropping effect of such issues.