涌泉根灌单点源入渗湿润体特性研究

Characteristics of Wetting Body under Bubbled-root Irrigation Point Source Infiltration

【目的】研究不同流量条件下湿润体特征值的变化规律。【方法】在陕北米脂山地微灌枣树示范基地,在原状土上进行了涌泉根灌入渗试验。【结果】涌泉根灌累积入渗量随流量的增大而增大,并能用Kostiakov模型进行了较为有效模拟。湿润体形状近似于椭球体,其竖直剖面上的入渗深度和水平运移距离均与入渗时间呈显著的幂函数关系。【结论】流量越大,涌泉根灌入渗竖直剖面上水平入渗距离和入渗深度均越大;灌水器流量对湿润体土壤水分分布和形状具有显著的影响。

【Objective】Ascertain the variation of the eigenvalues of the wetted body under different flow conditions.【Methods】The infiltration test of bubbled-root irrigation was conducted on the undisturbed soil in the jujube demonstration base of micro-irrigation in Mizhi Mountain in northern Shaanxi.【Result】The cumulative infiltration of spring root irrigation increased with the increase of flow rate,and Kostiakov model could be used to carry out more effective simulation.The shape of the wetted body was similar to that of the ellipsoid.The infiltration depth and the horizontal migration distance on the vertical section were both significant power functions with the infiltration time.【Conclusion】The greater the flow,the greater the vertical infiltration vertical infiltration vertical infiltration section horizontal infiltration distance and infiltration depth at bubbled-root irrigation.The larger the emitter flow rate,the greater the effect of emitter flow on the distribution and shape of soil moisture.