地下灌竖管灌水器直径压力对土壤水入渗特性的影响

发布时间：2018-05-30 03:11

本文选题：入渗 + 压力　；参考：《农业工程学报》2016年14期

【摘要】：研究竖管灌水器地下灌溉条件下,土壤质地、压力水头和竖管直径对土壤水分入渗特性的影响。选用粉质壤土和砂质壤土2种土壤,在0.5、1.0、1.5、2.0、2.5和3.0 m压力水头,以及竖管直径为4、8、12和16 mm条件下,测定5 h内土壤水分累计入渗量,并应用Philip公式对入渗过程进行拟合,计算入渗流量。结果表明,不同土壤质地下,累计入渗量均随压力水头增加而增加,但质地越重,累计入渗量越小,压力水头在入渗初期对累计入渗量影响较大,随入渗时间延长,其影响程度减弱。入渗流量开始较大,逐渐减小,入渗流量趋于稳定的时间过程较长。当压力水头为0.5~3 m,灌水器稳定入渗流量为0.53~1.25 L/h。土壤水分累计入渗量变化随竖管直径增大而减小,逐渐趋于稳定。基于竖管直径构建了累计入渗量估算模型,经验证,模型决定系数大于0.99,表明模型的可行性。研究可为竖管地下灌溉管网系统设计及应用提供参考。
[Abstract]:The effects of soil texture, pressure head and riser diameter on soil water infiltration characteristics were studied. Two kinds of soil, silty loam and sandy loam, were used to measure the cumulative infiltration amount of soil moisture within 5 hours under the pressure head of 0. 5 ~ 1. 0 and 1. 5 ~ 2. 0 and 3. 0 m pressure water head, and the diameter of vertical pipe was 4. 8 ~ 8 ~ 12 and 16 mm, and the infiltration process was fitted by Philip formula. Calculate the infiltration flow. The results showed that the accumulative infiltration amount increased with the increase of pressure head under different soil textures, but the more serious the soil texture, the smaller the cumulative infiltration amount, the greater the influence of pressure water head on the cumulative infiltration amount at the early stage of infiltration, and the longer the infiltration time. Its influence degree weakens. The infiltration flow began to be larger and gradually decreased, and the time process of the infiltration flow tended to be stable. When the pressure head is 0.5m, the steady infiltration rate of the emitter is 0.531.25L / h. The change of soil moisture cumulative infiltration decreased with the increase of vertical pipe diameter and tended to be stable. Based on the diameter of vertical pipe, an estimation model of cumulative infiltration is constructed. It is verified that the determination coefficient of the model is greater than 0.99, which indicates the feasibility of the model. The research can provide reference for the design and application of vertical pipe underground irrigation pipe network system.
【作者单位】：西安理工大学水利水电学院;
【基金】：国家自然科学基金资助项目(41571222;51279156) 高等学校博士学科点专项科研基金联合资助课题(20116118110010) 陕西省农业科技攻关项目(2010K02-08)
【分类号】：S152.7

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