摘要
通过模拟试验,研究了不同滴头流量、灌水量和滴头间距下双点源滴灌水分交汇作用对湿润锋运动规律的影响,结果表明:在交汇界面,湿润锋水平和垂直入渗距离与入渗时间符合多项式关系,在未发生交汇的平面符合幂函数关系。相同条件下,交汇界面处的水分向外扩散距离与距滴灌点源相同距离处未发生交汇的水分扩散距离相比增加了30%,湿润锋前沿处的含水率比其增大了81%。在滴头流量为0.8 L/h、灌溉水量17.0 L条件下,双点源交汇入渗在结束灌水时湿润锋水平和垂直湿润距离分别为31.0 cm和33.3 cm,比单点源入渗分别大1.0 cm和1.3 cm。此外,通过试验发现,增大滴头流量、灌水量或缩小滴头间距均能有效改善土壤湿润体的均匀性。
A series of experiments about the effect of dripper discharge, amount of applied water and dripper distance on soil wetted front had been researched under interference. The results of these experiment show that the horizontal and vertical movement distance of soil wetted front accorded good polynomial functional relation with infiltration time on the intersection side; meanwhile, it conformed to power function relation on the unntersection side. Under the same conditions, the wetted distance of soil on the intersection side was bigger than un-intersection side by 30%, and the soil water content was larger than that by 81%. The size of the wetted volume of the double points source of interference infiltration was larger than single point source, the horizontal and vertical movement distance of soil wetted front were longer than point source by 1.0 cm and 1.3 cm respectively when dripper discharge was 0.8 L/h, amount of applied water was 17.0 L. In addition, moisture uniformity could be improved by increasing dripper discharge, amount of applied water or decreasing dripper distance.
出处
《灌溉排水学报》
CSCD
北大核心
2008年第1期28-30,共3页
Journal of Irrigation and Drainage
基金
"十一五"863重点项目(2006AA100214)
关键词
滴灌
交汇入渗
湿润锋
drip irrigation
interference infiltration
wetted front
