垂直线源灌溉条件下交汇入渗特性研究

以模拟试验为基础,分析了垂直线源灌溉条件下不同线源长度和线源间距的交汇入渗特性,并提出了含线源长度和线源间距因子的入渗模型。结果表明,随着线源长度的增加,沿着供水管方向剖面和交汇面的湿润深度增加,湿润宽度无明显变化;随着线源间距的增加,沿着供水管方向的剖面的湿润深度减小,湿润宽度增大,在交汇面处湿润深度和湿润宽度均减小;累积入渗量随着线源长度的增加而增大,随着线源间距的增加而增大。经实测资料验证,入渗模型能有效的模拟垂直线源灌溉条件下交汇入渗特性。

Intersection Infiltration Characteristics of Vertical Line Source Irrigation

Vertical line source irrigation can transport water directly to the crop roots,which makes the distribution of soil water match to the crop roots,for reducing evaporation loss and heightening the use effect of water.This article,basing on the simulation test,analyses the intersection infiltration characteristics of different line source length and line source spacing of vertical line source irrigation,and presents the infiltration simulation that contains line source length and line source spacing factors.The results show that,with the increase of line source length,the wetted depth of profile along the two water pipes and intersection surface are also increasing,but the wetted width has no change;with the increase of line source spacing,the humid depth and width of profile along the two water pipes is decreasing and increasing respectively,and the wetted depth and width of intersection surface are reducing;the cumulative infiltration is increasing when the line source length and line source spacing increase.The measured data verifies that the infiltration simulation can effectively simulate the intersection infiltration characteristics of vertical line source irrigation,these results will prove theoretical basis for the use of vertical line source irrigation in the production practice.