摘要
由不同质地土壤的点源入渗实验 ,得出了在不同滴头流量情况下 ,实际滴灌可以形成两种入渗边界 ,边界一是非充分供水点源入渗边界 ;边界二为变边界积水点源入渗边界 .本文对两种边界条件特点及其滴头流量、灌水时间、湿润锋、含水量分布等之间的关系进行了分析 ,认为湿润比可以作为确定滴灌灌水参数的指标之一 ,对于实验滴灌的适宜湿润比以小于 1
The infiltration experiment of point source irrigation reveals that two kinds of boundary condition may occur, depending on the drip flux. One is non\|pond infiltration formed by insufficient flux, whereas another is pond infiltration with moving boundary. The characteristics of these two boundary conditions and the relationships among drip flux, irrigation duration, wetting front and distribution of soil moisture are analyzed in this paper. It concludes that the wetting front rate is one of the important parameters of drip irrigation and the best rate in less than 1 0.
出处
《水利学报》
EI
CSCD
北大核心
2000年第6期39-44,共6页
Journal of Hydraulic Engineering
关键词
点源
变边界积水
湿润比
入渗
水壤水分
drip irrigation
point source
infiltration
wetting front rate
moving boundary
