| Cite this article: | 苏媛媛,郭向红,胡飞鹏,等.蓄水坑灌下果园土壤水-热-氧三维分布数值模拟[J].灌溉排水学报,0,():-. |
| SU Yuanyuan,GUO Xianghong,HU Feipeng,et al.蓄水坑灌下果园土壤水-热-氧三维分布数值模拟[J].灌溉排水学报,0,():-. |
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| Numerical simulation of the three-dimensional distribution of soil water-heat-oxygen in orchards under water storage pit irrigation |
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SU Yuanyuan1, GUO Xianghong1,2, HU Feipeng1, SUN Xihuan1, MA Juanjuan1, ZHENG Lijian1, LEI Tao1
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1.Taiyuan University of Technology;2.State Key Laboratory of Simulation and Regulation of Water Cycle in River Basin, China Institute of Water Resources and Hydropower Research
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| Abstract: |
| 【Objective】In order to establish a three-dimensional soil water-heat-oxygen coupling model under water storage pit irrigation, to explore the effects of additional water storage pit and irrigation under water storage pit irrigation on soil water, heat, and oxygen, so as to reveal the distribution characteristics of the soil water, heat and oxygen under pit irrigation.【Method】Based on the soil moisture movement equation, soil heat transport equation and soil oxygen transport equation, a three-dimensional soil water-heat-oxygen coupling model under water storage pit irrigation was established. The numerical solution was carried out by COMSOL Multiphysics software, the model was verified and analyzed by field measured data. The validated model was used to simulate and analyze the effects of additional water storage pit and irrigation on the distribution of soil water, heat and oxygen in orchard.【Result】The results show that the three-dimensional coupling model established in this paper has high accuracy, the RMSE of soil moisture content, soil temperature and soil oxygen concentration were 0.0367, 1.6099 and 0.0138, respectively, the model can be used to simulate the distribution of water, heat and oxygen under different conditions of water storage pit irrigation. After the addition of water storage pit, the distribution of soil water, heat and oxygen in the pit wall changes greatly. Over time, around the water storage pit, soil moisture content decrease, soil oxygen content and oxygen concentration increase, and soil temperature in the pit and surface shows the same variation trend and decreases with the decrease of atmospheric temperature. After irrigation, the water penetrates into the soil through the pit wall, forming an ellipsoid-shaped high-value area of water content and low-value area of soil temperature and soil oxygen content with the pit bottom as the center. The distribution of the three will tend to be uniform over time. However, the effect of irrigation on soil temperature is less than that on soil moisture content and soil oxygen content. Irrigation has a lower effect on soil oxygen concentration, and its value is higher at the surface and pit wall, and farther away from the surface and pit wall, the lower the soil oxygen concentration.【Conclusion】The water storage pit increases the exchange interface of soil water, heat and oxygen at the pit wall. The soil water, heat and oxygen conditions at the pit wall are affected by evaporation, rainfall, atmospheric temperature, atmospheric oxygen concentration and other environmental conditions are similar with surface. The soil water, heat and oxygen conditions under water storage pit irrigation are more conducive to root growth. |
| Key words: water storage pit irrigation; water-heat-oxygen coupling; COMSOL; numerical simulation |
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