水利水电技术（中英文）

为了研究入渗水头对注射灌土壤水分运移及分布特性的影响,通过室内注射灌入渗模拟试验,测定了不同入渗水头下注射灌的累积入渗量、湿润锋运移距离和土壤剖面的含水率。研究表明:注射灌的累积入渗量与时间呈幂函数关系,入渗水头越大,相同入渗时间的累积入渗量越大。土壤湿润锋近似为圆心在出水口偏下的半圆形,湿润锋随时间延长运移速度变缓。在出水口下方土壤湿润范围比出水口上方大,土壤含水率也较大。入渗水头越大,相同入渗时间的土壤湿润范围越大,相同位置的土壤含水率越高。本研究结果丰富了注射灌理论,为入渗水头的选择提供参考。

In order to analyze the effect of infiltration water head on the characteristics of soil water transport and distribution,the cumulative infiltration,the transport distance of wetting front and soil profile water content of the injection irrigation under various infiltration conditions are measured through the relevant indoor simulating experiment. The study shows that a power function relationship is there between the cumulative infiltration and time,i. e. the larger the infiltration water head is,the higher the cumulative infiltration is to be in the same time. The wetting front is approximately to be the center of a semicircle a little bit lower under the water outlet and the transport speed of the wetting front slows down gradually along with time passing. The soil wetted area is larger below the water outlet than that above the water outlet with larger soil water content. Meanwhile,the larger the infiltration water head is,the greater the soil wetted area is to be at the same location. This study result enriches the theory of injection irrigation,and then can provide some references for the selection of infiltration head.