滴灌湿润体交汇情况下土壤水分运移特征的研究

以室内试验为基础，测定了重壤土、中壤土、砂壤土在不同滴头流量、不同灌水量下的滴灌交汇土壤水分入渗运动过程。研究结果显示了滴头流量、灌水量和土壤质地对交汇入渗湿润体形状的影响规律。滴灌入渗交汇界面的湿润锋水平和垂直距离与入渗时间之间符合良好的线性关系，湿润锋水平和垂直速度随着交汇时间的延长而增大。随着距滴头距离的增加，滴灌交汇入渗湿润体内的土壤含水率降低，湿润锋交汇界面处的土壤含水率一般均大于同等土壤深度的含水率。研究结果对滴灌系统设计理论具有一定的指导作用。

Research for Soil Water Movement from Drip Irrigation Iterference Infiltration

Based on experiments, the movement of soil water from drip irrigation was studied in clay-loam, loam, and in sandy soil under the different dripper discharge and drop water. It was found in these experiments that the effects of dripper discharge, drop water and soil types to the shape of wetted body were analyzed. The horizontal and vertical movement distance of soil wetted front were good line functional relation with infiltration time on the intersection side of drip irrigation. With intersection time increasing, the horizontal and vertical advance rate of wetted front was increase. With the distance of apart from drip increasing, the soil moisture of Wetted volume from drip irrigation was in reduce, the soil moisture of wetted front on intersection side was bigger than the soil moisture of similar wetted depth. The result of study has certain guidance functions to the systematic design theory of drip irrigation.