宽垄沟灌湿润锋运移特性试验研究

Research on Wetting Front Migration Characteristics under Furrow Irrigation of Wide Ridge

通过室内试验,研究了宽垄沟灌条件下土壤湿润锋运移特性。结果表明:随着沟宽的增加,土壤湿润锋垂向运移距离减小,横向运移距离增大;随着沟深和土壤初始含水率的增加,土壤湿润锋垂向运移距离和横向运移距离均有所增加。其中,土壤初始含水率为影响土壤湿润锋运移的主要因素。土壤湿润锋的垂向运移距离和交汇前的横向运移距离均与入渗时间呈良好的幂函数关系。研究结果可为改进沟灌技术提供技术参考。

Through laboratory experiments the migration characteristics of the soil wetting front under wide ridge furrow irrigation is studied .The results show that along with the increase in the furrow width ,soil wetting front vertical migration distance decreases , lateral migration distance increases .With the increase in furrow depth and initial soil moisture content ,soil wetting front vertical mi‐gration distance and lateral migration distance increases .Among them ,the initial soil moisture content is the main factor that affects soil wetting front transport .Vertical migration distance and lateral migration distance before the meeting of soil wetting front shows a good power function relationship with infiltration time ,and the results can serve as a technical reference for the improvement of furrow irrigation techniques .