| 引用本文: | 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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| 蓄水坑灌下果园土壤水-热-氧三维分布数值模拟 |
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苏媛媛1, 郭向红1,2, 胡飞鹏1, 孙西欢1, 马娟娟1, 郑利剑1, 雷涛1
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1.太原理工大学;2.中国水利水电科学研究院流域水循环模拟与调控国家重点实验室
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| 摘要: |
| 【目的】为了建立蓄水坑灌下三维土壤水-热-氧耦合模型，探究增设蓄水坑和蓄水坑灌灌水对土壤水、热、氧的影响，为蓄水坑灌下土壤水热氧状况的研究提供依据。【方法】基于土壤水分运动方程，土壤热量传输方程和土壤氧气传输方程建立蓄水坑灌下三维土壤水-热-氧耦合模型，利用COMSOL Multiphysics软件进行数值求解，采用田间实测数据对模型进行验证分析，并用验证后的模型模拟分析增设蓄水坑和蓄水坑灌灌水对果园土壤水、热、氧分布状况的影响。【结果】结果表明：建立的三维耦合模型具有较高的精度，模型模拟土壤含水率土壤温度和土壤氧浓度的RMSE分别为0.0367，1.6099和0.0138，可用于模拟分析蓄水坑灌不同情况下的水热氧分布。相比未设蓄水坑时的土壤水热氧分布，增设蓄水坑后，坑壁土壤水、热、氧状况发生较大改变，随着时间推移，蓄水坑周土壤含水率降低，土壤含氧量和氧浓度升高，而土壤温度开始受气温影响发生变化。蓄水坑灌灌水后，水分通过坑壁渗入土壤，形成以坑底为中心的椭球状含水率高值区和土壤温度、土壤含氧量低值区，三者分布都会随时间推移趋向均匀，但灌水对土壤温度的影响时间远少于对土壤含水率和土壤含氧量的影响时间。灌水对土壤孔隙氧浓度影响较低，其值在地表和坑壁较高，距地表和坑壁越远，土壤氧浓度越低。【结论】蓄水坑增加了坑壁处的土壤水、热、氧交换界面，坑壁处土壤水、热、氧状况受蒸发，降雨，大气温度和大气氧浓度等环境条件与地表产生相似的变化；蓄水坑灌下的土壤水热氧状况更有利于根系生长。 |
| 关键词: 蓄水坑灌；水-热-氧耦合；COMSOL；数值模拟 |
| DOI： |
| 分类号:S152 |
| 基金项目:国家重点实验室开放研究基金费用(IWHR-SKL-202110)； 山西省水利科学技术研究与推广项目(2022GM012) |
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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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