论文部分内容阅读
通过室内模拟试验与理论分析,探究4种不同土壤初始含水率条件下深层坑渗灌土壤水分运动规律。结果表明:初始含水率对入渗特性有显著影响。相同入渗时间,初始含水率越大,累积入渗量越小,入渗率也越小;而湿润锋运移距离随初始含水率的增大而增加;初始含水率越大,湿润体也越大,且相同位置的含水率也越大。建立了改进的Kostiakov入渗模型,以及初始含水率与湿润锋运移距离的幂函数关系,对所建模型进行验证,精度较高。
Through indoor simulation test and theoretical analysis, the law of soil water movement in deep pit infiltration under four different soil initial moisture contents was explored. The results show that the initial moisture content has a significant effect on the infiltration characteristics. The same infiltration time, the greater the initial water content, the smaller the cumulative infiltration, the infiltration rate is smaller; and wetting front migration distance increases with the initial moisture content increases; the greater the initial moisture content, wet body The larger, and the same position, the greater the moisture content. An improved Kostiakov infiltration model, as well as the power function relationship between the initial moisture content and the migration distance of wetting front were established. The proposed model was verified with high accuracy.