| Cite this article: | 朱 君.负水头环境土壤水分湿润锋运移三维模型与验证[J].灌溉排水学报,0,():-. |
| ZHU Jun.负水头环境土壤水分湿润锋运移三维模型与验证[J].灌溉排水学报,0,():-. |
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| DOI： |
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| Three-dimensional Model of Soil Wetting Front Moving in Negative Head Environment and Verification |
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ZHU Jun
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China Institute For Radiation Protection Key laboratory of nuclear environmental simulation andevaluation technology
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| Abstract: |
| 【Objective】In order to control soil water content more effectively and guide water-saving irrigation.【Method】The sand and loam in Yuci area of Shanxi Province were selected to establish soil wetting front moving experiments under three kinds of negative head(0m、-0.5m、-1.0m). The negative head soil moisture wetting front migration test and Hydrus-3D soil moisture migration numerical model were used to researched the law of soil moisture wetting front movement and the validity of the model.【Result】The cumulative infiltration increases with the increase of time, also can be expressed by power function. With the increase of time, the wetting front gradually expands to horizontal and vertical directions, and not only the curve presents a 1/4 ellipse shape, but also the maximum wetting distance with the square root of time can be expressed by linear relation. The infiltration velocity of wetting front decreases with the increase of negative head and can be expressed by power function too. The measured wetting front envelope area at negative head of -0.5m and -1.0m was used as model validation data. The deviation of wetting front envelope area between numerical calculation and measured, sand is 0.51%～7.21%, loam is 0.22%～16.03%.【Conclusion】The three-dimensional model can be used to describe the migration characteristics of soil wetting front in negative head environment, and to predict the movement and distribution of moisture content under different conditions. |
| Key words: Negative Head; Cumulative infiltration; Water front; Infiltration velocity; Hydrus-3D |
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