坡地上灌水器流量均等微灌双向毛管设计方法

摘要

Based on the definition of the best submain position locations in which the same minimum pressure exists in uphill and downhill laterals, a method was developed for designing micro-irrigation paired laterals with emitters at homologous discharge rate, allowable maximum and minimum pressure along laterals were conditions needed to satisfy. When the designed emitter discharge, emitter space and one or two parameters ( length, diameter or pressure head) of a paired lateral were provided, the unknown parameters and the best submain position could be designed at any field slope conditions. The results show that the final solutions can be obtained quickly and reasonably.%根据最佳支管位置位于左右两侧毛管最小压力水头相等处的定义,结合能量廓线法推导出确定最佳支管位置的简易计算方法,并提出一种满足允许的最大压力水头和最小压力水头的微灌系统双向毛管设计方法.通过对多种存在条件的模拟计算,确定了最佳支管位置计算公式的最终形式、适用条件及其优化试算方式.利用该方法,能简便快速地设计各种坡地条件下微灌系统(灌水器流量均等)双向毛管.