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通过室内模拟实验,进行灌水量恒为10 L,采用土壤初始含水率为7.6%、14.8%和21.3%及滴头流量为1 L/h、2 L/h和3 L/h,探求土壤初始含水率和滴头流量对盐碱土水盐运移的影响,结果表明:在相同灌水量及滴头流量下,随着土壤初始含水率的增大,滴头附近高含水率的区域增大,水分水平运移速率减小,垂向运移速率增大,利于水分的向下运移,在水平方向的脱盐区域减小,而在垂向的脱盐区域明显增大;在相同的土壤始含水率条件下,随着滴头流量的增大,水分水平运移距离增大,水平脱盐效果明显,而垂向脱盐区减小,小滴头流量利于土壤中盐分的向下运移,有助于压盐;以滴头为中心,湿润锋水平、垂向运移距离及两滴头湿润锋交汇宽度与时间t具有良好的幂函数关系。
Through indoor simulation experiments, the initial irrigation was 10L, initial soil moisture was 7.6%, 14.8% and 21.3%, and the dripper flow rates were 1 L / h, 2 L / h and 3 L / h, respectively. The results showed that with the increase of initial water content of soil, the area with high water cut near dripper increased under the same irrigation volume and dripper flow rate, Water transport rate decreased and vertical transport rate increased, which favored the downward migration of water, decreased in the horizontal desalination zone, and significantly increased in the vertical desalination zone. When the same soil started to contain water With the increase of the dripper flow rate, the horizontal migration distance of water increased, the horizontal desalination effect was obvious, while the vertical desalination zone decreased, and the droplet flow was conducive to the downward movement of salt in the soil, which was helpful In the pressure salt; with the drip centers as the center, the horizontal and vertical migration distance of the wetting front and the intersection width of two dripper wetting fronts have a good power function relationship with time t.