| 摘要: |
| 【目的】研究建立膜孔沟灌水流推进模型，通过分析膜孔沟灌水流推进过程，准确、方便确定膜孔沟灌灌水技术要素、田间平均入渗率和糙率。【方法】通过引入地表储水形状系数、下渗水形状系数和膜孔沟灌入渗方程，建立基于水量平衡的膜孔沟灌水流推进模型，并通过田间试验对模型进行检验。【结果】模型检验表明，试验实测数据与模型计算值吻合较好；对田间膜孔沟灌试验验证模型计算误差绝对值均值的分析可知，试验中各灌水沟除个别组误差绝对值均值大于5%外，其余均在5%以下；多组灌水沟的误差绝对值均值小于4%，可以满足膜孔沟灌灌水技术指标确定的需要。【结论】所建模型具有较为严谨的物理基础，计算求解方便、精度较高，具有较强实用性。 |
| 关键词: 膜孔沟灌 水量平衡模型 地表储水形状系数 下渗水形状系数 |
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| 基金项目:国家“863”计划项目（2011AA1005A4） |
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| Research on the model of film hole furrow irrigation water movement based on water balance method |
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| Abstract: |
| 【Objective】To determine the irrigation technical index,average field infiltration rate and roughness coefficient accurately and easily through analyzing film hole furrow irrigation water movement process,the film hole furrow irrigation water movement model was studied.【Method】Through introducing figure coefficients of surface water storage and infiltration water and infiltration equation of film hole furrow irrigation,the model of film hole furrow irrigation water movement on the basis of water balance method was set up,and the model results were verified with some field experimental values.【Result】The examination of the model shows that the results of numerical simulation of the model are in good agreement with the observed data of film hole furrow irrigation experiment in the field.The average values of model calculation error absolutes,which testify the field experiments of film hole furrow irrigation,show that the average values of error absolutes of irrigation furrows for trials in addition to the individual are more than 5%,others are all less than 5%;and the average values of error absolutes of many furrows are less than 4%,so it can satisfy the requirements of determining the reasonable technical index of film hole furrow irrigation.【Conclusion】The model has some advantages,such as rigorous physical basis,simple calculation,high accuracy and practicability. |
| Key words: film hole furrow irrigation water balance model figure coefficient of surface water storage figure coefficient of infiltration water |
