浑水膜孔灌单向交汇入渗特性试验研究  

Experimental study on single-line interference infiltration characteristics of muddy water film-hole irrigation

作　　者：周文[1,2] 曹琳[2] 王锦辉 

机构地区：[1]西安理工大学水利水电学院,陕西西安710048 [2]华北水利水电大学水利学院,河南郑州450045 [3]西北综合勘察设计研究院,陕西西安710003

出　　处：《排灌机械工程学报》2017年第7期627-633,共7页Journal of Drainage and Irrigation Machinery Engineering

基　　金：国家自然科学基金资助项目(50979089)

摘　　要：为了了解含沙率对浑水膜孔灌单向交汇入渗特性影响情况,对比分析了不同含沙率的浑水膜孔灌单向交汇入渗数据,在此基础上通过模型分析了浑水膜孔灌单向交汇入渗参数、湿润锋运移参数与含沙率的关系;提出了不同含沙率的浑水膜孔灌单向交汇入渗单位膜孔面积累积入渗量模型、自由面和交汇面湿润锋运移模型;揭示出不同含沙率的浑水膜孔灌单向交汇入渗与同一条件下清水的减渗特性及其影响规律.由所得结果发现,浑水含沙率与单位膜孔面积累积入渗量之间存在负相关关系,而入渗系数与含沙率也存在同样的关系,入渗指数与含沙率的相关性为正相关;交汇时间随含沙率逐渐增大而逐渐增加;在同一入渗时间内,随浑水含沙率增大,自由面和交汇面的垂直和水平湿润锋运移距离都不断减小;各种含沙率条件下的浑水膜孔灌单向交汇入渗与相同条件下的清水对比,减渗结果存在明显的差异,在含沙率增大的过程中,减渗率也逐渐增大.Single-line interference infiltration characteristics of muddy water film-hole irrigation are studied. In indoor experiments, four sand contents are attempted and single-line interference infiltra- tion of clean water film-hole irrigation is conducted for comparison. The relationships of infiltration pa- rameters in single-line interference infiltration of muddy water film-hole irrigation, single-line interfer- ence time, wetting front movement parameters with sand content are established. A cumulative infiltra- tion model, free surface and interference surface wetting front movement models are put forward for dif- ferent sand contents. The reduction feature in infiltration due to sand content is revealed and is correla- ted to sand content. The results show that with increasing sand content, the cumulative infiltration de- creases, and all are less than the infiltration of clean water under the same experimental condition, and infiltration coefficient K decreases while infiltration index increases with increasing sand content. Inter- ferenee time increases with increasing sand content. For the same infiltration time, with increasing sand eontent, free surface and interference surface vertical and horizontal wetting front movement dis- tanees are reduced gradually. The infiltration with sand content is reduced in eomparison with that un- der elean water condition, and with increasing sand content, the reduction rate increases gradually.

关 键 词：浑水膜孔灌 单向交汇 交汇时间 减渗特性 入渗试验 

分 类 号：S274.3[农业科学—农业水土工程]