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为探索初始土壤含水率对涌泉根灌过程中湿润锋运移和土壤水分分布的影响,合理确定灌水技术参数,配置了5种不同初始土壤含水率,采用室内土箱模拟试验方法,研究了土壤初始含水率对涌泉根灌均质土壤水分扩散的影响.结果表明:涌泉根灌条件下,初始含水率对湿润体形状的影响不大,对其大小有明显影响;土壤表面湿润时间与初始含水率呈递减关系,土壤表面湿润半径、湿润体水平与垂直距离的增长速度均随着土壤初始含水率的增大而增大;土壤初始含水率越大湿润体内水分分布越均匀;试验拟合的根据土壤初始含水率计算地表湿润半径、最大湿润体水平半径与垂直深度的经验公式,计算值和实测值之间误差较小,整体误差分别为0.63%,0.4%,0.83%和0.59%,0.12%,0.73%,可用经验公式推算涌泉根灌土壤水分渗透参数,作为涌泉根灌系统设计依据.
In order to explore the influence of initial soil water content on wetting front migration and soil water distribution in the process of root irrigation, a reasonable technical parameters of irrigation were set up, and five different initial soil moisture contents were allocated. The indoor soil box simulation test method was used to study The effect of soil initial moisture content on water dispersal of homogeneous soil water in Yongquan spring was studied.The results showed that initial water content had little effect on the shape of moist body and had a significant effect on the size of the soil under the condition of spring root irrigation.The soil surface wetting time And the initial moisture content showed a decreasing relationship between the soil surface wetting radius, wetting body and vertical distance of the growth rate increases with the increase of soil initial moisture content; the greater the initial moisture content of soil moist water distribution more evenly; test The error between the calculated value and the measured value is less than 0.63%, 0.4%, 0.83% and 0.59, respectively, based on the empirical formulas of calculating the surface wetting radius, the maximum radius of wetting body and the vertical depth according to the initial soil moisture content of the soil. %, 0.12% and 0.73% respectively. The empirical formula can be used to calculate the soil water infiltration parameters of spring root irrigation as the design basis of the spring root irrigation system.