【摘要】 滴头流量和灌水量对于滴灌系统的设计具有非常重要的实际价值。通过室内试验,对不同土质、不同滴头流量情况下滴灌土壤水分运动进行了室内试验研究。结果表明,砂土条件下,滴灌湿润体呈现越来越"尖"的直立半椭球体,滴头流量的增大会使垂直湿润锋的运移更加显著。轻壤土条件下,滴灌湿润体基本上一直呈现为平卧的半椭球体,逐渐变成半球体。滴头流量的增大会使水平湿润锋的运移更加显著。在灌水量一定的情况下,滴头流量的增加在砂土条件下会加快水分在垂直方向的运移,在轻壤土条件下则会加快水分在水平方向的运移。更多还原

【Abstract】 Emitter discharge and irrigation amount have a very important practical value for drip irrigation system design.Through indoor laboratory testing,the variation laws of soil water movement are studied under different soil textures and different emitter discharges conditions.The results indicate that under sandy soil condition,the wetting bodies show more "sharp" with time and erect semi-ellipsoid.The increases of emitter discharge will make the vertical wetting front movement more significant.Relatively,under light loam condition,the wetting bodies basically have been kept as a horizontal semi-ellipsoid in a very long period after irrigation,and gradually become a hemisphere.The increases of emitter discharge will make the horizontal wetting front movement more significant.When irrigation amount is certain,the increases of emitter discharge will accelerate vertical water movement in sandy soil,while horizontal in light loam.更多还原