排灌机械工程学报
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排灌机械工程学报  2014, Vol. 32 Issue (1): 72-79    DOI: 10.3969/j.issn.1674-8530.12.0153
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初始含水率对微润灌溉线源入渗特征的影响
张俊1,2,3, 牛文全1,3, 张琳琳3, 史丽艳1, 吴泽广1
1.西北农林科技大学水土保持研究所, 陕西 杨凌 712100; 2.陕西省土地工程建设集团, 陕西 西安 710075; 3.中国科学院水利部水土保持研究所, 陕西 杨凌 712100
Effects of soil initial water content on line-source infiltration characteristic in moistube irrigation
Zhang Jun1,2,3, Niu Wenquan1,3, Zhang Linlin3, Shi Liyan1, Wu Zeguang1
1.Institute of Soil and Water Conservation, Northwest A&F University, Yangling, Shaanxi 712100, China; 2.Shaanxi Land Construction Group, Xi′an, Shaanxi 710075, China; 3.Institute of Soil and Water Conservation, CAS & MWR, Yangling, Shaanxi 712100, China)〓〓〓〓
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摘要 为探明微润灌土壤湿润体特性的变化规律,以扰动均质土壤为研究对象,采用室内模拟试验的方法,分析了不同初始含水率(2.1%,5.6%,8.0%,10.1%)条件下微润灌土壤湿润锋运移距离和水分分布的变化规律.结果表明:土壤初始含水率对微润灌溉线源扩散有较大的影响,湿润锋推进速率、地表湿润时间随着初始含水率的增大而增大,并与灌水时间呈幂函数关系;湿润体形状受初始含水率影响非常小,其横断面为近似圆形;一定灌水时间内,累计入渗量、平均入渗率与初始含水率呈正相关性,且到达稳定入渗率的时间与初始含水率呈负相关性,湿润锋推进速率与初始含水率呈正相关关系,扩散系数与初始含水率成指数递增关系,不同初始含水率的不同方向土壤水分扩散指数介于0.50~0.60之间;湿润体内水分呈同心圆分布,含水率梯度随着初始含水率的增大而减小;微润灌均匀系数随初始含水率的增大而增大.研究结果可为微润灌溉技术推广应用提供理论依据. 
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张俊
牛文全
张琳琳
史丽艳
吴泽广
关键词微润灌   初始含水率   线源   湿润锋   土壤水分     
Abstract: In order to identify effects of soil initial water content on line-source infiltration characteristics in moistube irrigation, the wetting front advance distance and soil moisture variation feature were investigated through indoor simulation experiments for isotropic soil under four initial water contents: 2.1%, 5.6%, 8.0% and 10.1%. The experimental results revealed that soil initial water content had a great effect on line-source infiltration, the advance speed of wetting front and surface wetting time were raised and extended with increasing initial water content, and could be presented by a power function of irrigation time. Meanwhile, the shape of wetting soil was slightly affected by initial water content and its cross-section shape was kept to be nearly circular. During an irrigation event, the cumulative infiltration and average infiltration rate were positively correlated with initial water content, but the time for a stable infiltration rate was negatively related to the content. The water content inside a wetting soil body was distributed concentrically, and the moisture gradient was decreased with increasing initial water content, however, the uniformity coefficient of moistube-irrigation was increased with the content.Those results may be useful for application of moistube-irrigation.
Key wordsmoistube-irrigation   initial water content   line-source   wetting front   soil moisture   
收稿日期: 2012-11-02;
基金资助:

国家863计划项目(2011AA100705);教育部、国家外专局111计划项目(B12007)

通讯作者: 张俊(1988—),男,陕西镇安人,硕士研究生(zhangjun19880202a@163.com),主要从事土地工程与节水灌溉技术研究.   
作者简介: 牛文全(1972—),男,甘肃甘谷人,研究员,博士生导师(nwq@vip.sina.com),主要从事水土资源高效利用与节水灌溉技术研究.
引用本文:   
张俊,,牛文全等. 初始含水率对微润灌溉线源入渗特征的影响[J]. 排灌机械工程学报, 2014, 32(1): 72-79.
ZHANG Jun-,,NIU Wen-Quan- et al. Effects of soil initial water content on line-source infiltration characteristic in moistube irrigation[J]. Journal of Drainage and Irrigation Machinery Engin, 2014, 32(1): 72-79.
 
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