低压微润带出流与入渗试验研究

室内进行了低压微润带出流与入渗特性试验。结果表明,微润带在空气和土壤中的出流量与压力显著线性相关;在同一压力下,微润带在土壤中的出流量比在空气中小40%～70%,压力越大,二者值相差越大。入渗过程中,湿润体形状表现为圆形,湿润锋运移距离与供水时间之间存在良好的幂函数关系;土壤含水率以微润带为中心对称分布,离微润带的距离越远含水率越低。研究结果为低压微润带的应用提供依据。

Research on Flow and Infiltration of Low-Pressure Moistube

The flow and infiltration characteristics of Low-Pressure Moistube were studied by laboratory experiments.Results showed that there was a significant linear between the pressure and flow of Moistube both in air and soil.Under the same pressure,the flow of Moistube in soil was lower 40% to 70% than in air,and the greater the pressure,the greater difference between the two values.During Infiltration process,the wet fronting shaped in round and wetting front movement could be well described by a power function of time.Soil moisture content was symmetrical under the centre of Moistube,and the farther the distance from the Moistube,the lower for the moisture content.The results provided a basis for the application of Low-Pressure Moistube.