不同滴头流量下土壤水分分布特性研究

Different Dripper Flow Study on Soil Moisture Distribution Characteristics

[目的]通过进行原状土的滴灌入渗试验,研究了不同流量、不同灌水历时条件下,地表滴灌湿润体的变化规律及滴灌结束时的水分分布规律.[方法]采用湿润锋观测、suffer软件绘等值线.[结果]在滴头处和距滴头10 cm处垂直滴灌带方向水平湿润锋在0～180min内呈现幂指数增长关系,在180 ～600 min与时间呈直线关系;在竖直湿润锋方面,随着滴头流量的增大,滴头处和距滴头10 cm处水平湿润锋运移距离增大的幅度比竖直方向湿润锋运移距离增大的幅度要大,并且都呈对数函数趋势;灌水结束24h时水分再分布过程中,竖直方向湿润锋增大的幅度较水平方向湿润锋增大的幅度要大.[结论]不同流量、不同灌水历时条件下都会影响湿润体形态.

[ Objective ] Through drip irrigation infiltration tests of undisturbed soil, the effects of different flow and different irrigation duration on the variation of moist body and the moist distribution at the end were studied. [ Method] Observations using the wetting front and suffer con- touring software were adopted. [ Result] In the office and away from the dropper vertically emitter drip tape horizontally at the wetting front 10 cm presented a power of growth in 0 - 180 min, and a linear relationship in 180 - 600 rain. In terms of vertical wetting front, with the increase of dripper flow, the increase of the magnitude at dripper department and at 10 em from the emitter level wetting front distance of the horizontal direction was larger than that of the wetting front distance of the vertical direction, and presented the trend of logarithmic functions. At the end of the irrigation water redistribution process after 24 h, the increase of the magnitude of wetting front of vertical direction was larger than that of the horizontal direction. [Conclusion] Different flow and different irrigation duration would affect the moist body morphology.