地面灌溉节水技术研究——沟灌水流运动的数值模拟及其应用

本文利用运动波方法建立了自由排水沟尾边界的沟灌水力学数值计算模型,并与田间灌水试验结果进行了比较,一致性良好。所建模型具有计算稳定性好、速度快和内存小的特点,可以在微机上使用。文中提出了以灌水定额控制灌水量和以均匀系数评价灌水效果的概念。同时,本文提出一种试算方法来研究自由排水沟尾边界和挡水沟尾边界条件下确定灌水技术参数合理组合的途径。

STUDIES ON WATER-SAVING TECHNIQUES OF SURFACE IRRIGATION——NUMERICAL SIMULATION OF THE FURROW IRRIGATION FLOW AND ITS APPLICATION

A hydraulic mathematical model of furrow. irrigation with free draining end boundary was established by using the kinematic-wave method in this paper, and a good agreement between the model result and the field test was found. The established model shows good calculation stability, high speed, and small storage. It can be used in microcomputer. In this study, we adopt a new concept that the irrigating water quota is used to control the amount of irrigation water and that the uniform coefficient is used to evaluate the irrigation result. At the same time, we put forth a trial and error method to study the way to determine the rational combination of technical parameters for furrow irrigation under the conditions of free draining end boundary and blocked end boundary.