| 含沙率对层状土浑水膜孔灌单点源自由入渗特性的影响 |
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| 引用本文： | 白瑞,费良军,陈琳,钟韵.含沙率对层状土浑水膜孔灌单点源自由入渗特性的影响[J].水土保持学报,2020,34(2):43-49,55. |
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| 作者姓名： | 白瑞 费良军 陈琳 钟韵 |
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| 作者单位： | 西安理工大学省部共建西北旱区生态水利国家重点实验室, 西安 710048 |
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| 基金项目： | 国家自然科学基金项目（51779205，51479161）；陕西省水利科技项目（2014slkj-02） |
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| 摘 要： | 为探究不同浑水含沙率对层状土入渗特性的影响,通过室内膜孔灌自由入渗试验,研究了以夹砂层位置为5~10cm的层状土条件下清水和不同含沙率的浑水(2%,5%,7%,9%)入渗的累积入渗量、湿润锋运移规律以及湿润体内土壤含水量分布情况,分别建立了层状土不同含沙率浑水膜孔灌入渗量、湿润锋运移距离与入渗时间之间的关系;提出了基于清水入渗的不同浑水含沙率单位膜孔面积累积入渗量模型。结果表明:不同浑水含沙率累积入渗量变化趋势一致,但含沙率越大,累积入渗量越小,浑水减渗作用越明显,对应入渗系数越小,入渗指数越大;湿润锋运移距离随含沙率的增大而减小,当水分入渗到壤—砂交界面时,湿润锋在垂向上出现明显停滞,仅在水平方向上随入渗时间不断推进;供水结束后不同浑水含沙率下土壤湿润体内水分主要集中砂层以上,土壤含水量随浑水含沙率的增大而减小。研究结果可为进一步研究层状土浑水膜孔灌灌溉技术提供理论参考。
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| 关 键 词： | 含沙率 层状土 浑水膜孔灌 减渗作用 阻渗 |
| 收稿时间： | 2019/7/25 0:00:00 |
Effect of Sediment Concentration on Single Point Source Free Infiltration Characteristics of Muddy Water in Layered Soil with Film Hole Irrigation |
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| BAI Rui,FEI Liangjun,CHEN Lin,ZHONG Yun.Effect of Sediment Concentration on Single Point Source Free Infiltration Characteristics of Muddy Water in Layered Soil with Film Hole Irrigation[J].Journal of Soil and Water Conservation,2020,34(2):43-49,55. |
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| Authors: | BAI Rui FEI Liangjun CHEN Lin ZHONG Yun |
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| Institution: | State Key Laboratory of Eco-hydraulics in Northwest Arid Region of China, Xi''an University of Technology, Xi''an 710048 |
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| Abstract: | In order to explore the effect of different sediment concentrations on infiltration characteristics of muddy water in layered soil, using the indoor free infiltration test of film hole irrigation, the cumulative infiltration, the wetting front migration law and the distribution of soil water in the wet body of clear water and different sediment concentrations (2%, 5%, 7% and 9%) of muddy water in layered soil with 5-10 cm sand layer were studied. The relationships of the cumulative infiltration volume, the wetting front migration distance and the infiltration time were established. The cumulative infiltration volume model of per unit film hole area under different muddy water sediment concentrations was proposed based on clear water infiltration. The results showed that there was a consistent trend for the cumulative infiltration under different sediment concentrations. The larger the sediment concentration was, the smaller the cumulative infiltration was, resulting in the more obvious of infiltration reduction force with muddy water. The smaller the infiltration coefficient was, the larger the infiltration index was. The wetting front migration distance decreased with the increasing of sediment concentrations. When the water infiltrated into the loam-sand interface, the wetting front had a significant stagnation in the vertical direction, which advanced with the infiltration time only in the horizontal direction. The soil moisture in the wet body mainly concentrated above the sand layer, and the soil water contents decreased with the increase of the muddy water sediment concentrations. These results could provide a theoretical reference for further research of muddy water film hole irrigation technology in layered soil. |
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| Keywords: | sediment concentration layered soil muddy water film hole irrigation infiltration reduction force prevent infiltration |
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