用进退比模型设计长畦分段灌溉

Designing Long-border-phasing-irrigation Using Advance/Recessiion Model

长畦分段灌溉是一种节水型地面灌新方法。本文根据畦灌水流运动的特性,提出了具有经验参数少、简单实用的长畦分段灌溉设计模型,模型中一般仅包含一个待定的经验参数β_0,称为进退比。田问灌水试验表明,β_0值较为稳定,且容易获得。文中还阐述了不同情况下β_0值的确定方法。

The long-border-phasing-irrigation is a new water-saving irrigation method. The paper presents a simple design model on the basis of hyolraulic characteristics of flow in the field. There is only one experience parameter β_0, called as advance/recession ratio, in this model. Field experiments indicated that β_0 is more stoble and easy to obtain. A method to chose β_0 value in certain cases are also presents in this paper.