水保所知识产出(1956---)知识库

根据微灌毛管水力解析模型，通过分析微灌双向布置和单向顺坡布置形式对流量偏差率及毛管进口工作水
头的影响，得出均匀坡微灌毛管双向布置的适用条件为最佳支管位置参数大于0. 13，当最佳支管位置参数不大于0. 13
时，微灌毛管宜单向顺坡布置。给出了考虑适宜布置形式的均匀坡微灌毛管设计步骤。通过2 个设计实例表明: 利用最
佳支管位置参数标准可有效选取适宜的毛管布置形式，设计步骤简便可行，可直接应用于微灌工程实践中。

The chosen of lateral layout is the basis of hydraulic design of micro-irrigation laterals．
A simple and easily adaptable analytical approach was developed for the hydraulic design of microirrigation
laterals laid on uniformly sloping grounds based on the appropriate layouts． Two indictors for
comparing the emitter flow variation and inlet working pressure head from the paired layout and single
downhill layout were proposed based on the analytical models of micro-irrigation laterals． By evaluating
the effects of micro-irrigation laterals layouts on the emitter flow variation and working pressure head，the
application condition for paired layout was suggested as the best manifold position is not less than 0. 13．
When the best manifold position is less than 0. 13，the micro-irrigation lateral was proposed to use the
single downhill layout in order to save the extra cost of material and installation from the paired layout．
The design procedure for hydraulic design of micro-irrigation laterals was revised by considering the
determination of appropriate layout． Two design cases covering various conditions indicated that the best
manifold position criterion for determining the appropriate layout is more effective than the value of ground
slope proposed by Keller method． The proposed approach could produce accurate results for practical
purposes． This research could provide valuable information for improving the hydraulic design of microirrigation
systems．