微润灌溉土壤湿润体运移模型研究  

Prediction Model of Wetted front Migration Distance Under Moistube-irrigation

作　　者：薛万来[1,2] 牛文全[1,2] 罗春艳[3] 薛璐[3] 吴泽广[3] 

机构地区：[1]西北农林科技大学水土保持研究所,陕西杨凌712100 [2]中国科学院水利部水土保持研究所,陕西杨凌712100 [3]西北农林科技大学水利与建筑工程学院,陕西杨凌712100

出　　处：《水土保持学报》2014年第4期49-54,共6页Journal of Soil and Water Conservation

基　　金：国家高技术研究发展计划(863计划)(2011AA100507);高等学校学科创新引智计划(No.B12007)

摘　　要：为探明微润灌溉土壤入渗湿润体运移的变化规律,采用室内土箱模拟的方法,以粘壤土为例,选取不同土壤容重、初始含水率、管带埋深和压力水头等4个因素进行试验,研究这些因素对微润灌土壤入渗湿润锋随时间运移关系的影响。结果表明:在相同入渗时间内,湿润锋运移距离随土壤容重的增大而减小,随土壤初始含水率和压力水头的增大而增大,但不同管带埋深对湿润锋运移无显著影响;湿润锋垂直和水平方向运移距离与时间的1/2次方呈线性函数关系,以此为基础建立了包括土壤容重、初始含水率和压力水头的综合预测模型,用建立的综合模型对微润灌土壤入渗湿润锋运移距离进行预测,并对预测值与试验值进行比较,结果表明综合模型的预测精度较高。In order to research the characteristic variation of wetting body in moistube-irrigation, the follow- ing four factors as different soil bulk density, initial soil moisture, the burying depth and hydraulic heads of clay loam soil were studied to investigate the effect of these factors on wetting body. The results showed that the velocity of wetted front decreased when the soil bulk density increasing and increased when the initial soil moisture increasing while burying depth had no significant effect on it. There was a linear relationship be- tween wetting front transport distance and time 1/2 power. Comprehensive prediction model with parameters of soil bulk density, initial soil moisture and hydraulic heads was built. This comprehensive model was used to predict the wetting front distance and compare the predictive and measured values, it indicated that the comprehensive model had better prediction precision.

关 键 词：微润灌溉 湿润体 入渗 模型 

分 类 号：S275.3[农业科学—农业水土工程]