考虑水迁移率动态变化改进土壤溶质地表流失模型
农田土壤溶质的地表径流流失是农业面源污染的重要组成部分,为了更加有效预测和控制农田土壤溶质的流失,该文将水迁移率考虑为随土壤侵蚀变化而变化的函数,并修改Hydrus-1D代码数值求解土壤溶质的地表径流浓度值。利用两组已经发表的试验数据对改进的模型进行校验,研究结果表明该文模拟值与观测数据的相关系数r≥0.81,残差绝对均值和均方根差与原模型的模拟值相比,分别平均减少了35.42和60.77 mg/L,该文改进的模型能更好地模拟土壤溶质的地表径流流失规律。该文的研究成果将为实际预防和控制农业面源污染提供参考。...
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| Published in | 农业工程学报 Vol. 32; no. 4; pp. 135 - 141 |
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| Main Author | |
| Format | Journal Article |
| Language | Chinese |
| Published |
中国地质大学 北京 地下水循环与环境演化教育部重点试验室,北京,100083%中国地质大学 北京 水资源与环境学院,北京,100083
2016
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| Subjects | |
| Online Access | Get full text |
| ISSN | 1002-6819 |
| DOI | 10.11975/j.issn.1002-6819.2016.04.019 |
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| Summary: | 农田土壤溶质的地表径流流失是农业面源污染的重要组成部分,为了更加有效预测和控制农田土壤溶质的流失,该文将水迁移率考虑为随土壤侵蚀变化而变化的函数,并修改Hydrus-1D代码数值求解土壤溶质的地表径流浓度值。利用两组已经发表的试验数据对改进的模型进行校验,研究结果表明该文模拟值与观测数据的相关系数r≥0.81,残差绝对均值和均方根差与原模型的模拟值相比,分别平均减少了35.42和60.77 mg/L,该文改进的模型能更好地模拟土壤溶质的地表径流流失规律。该文的研究成果将为实际预防和控制农业面源污染提供参考。 |
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| Bibliography: | Solute loss from soil into surface runoff water plays a significant role in agricultural non-point source pollution. Thus, studying the mathematical model of solute loss in runoff is important for forecasting and controlling fertilizer loss in farmland. Water transfer rate is taken as the function of soil erosion in this study, and water transfer rate is not a constant but an exponent function of time, which decreases with time and finally achieves an unchangeable value, residual water transfer rate. The soil erosion based model is modified and the numerical solution of solute concentration in surface runoff water is obtained through modifying the Hydrus-1D code. And, only the solute numerical model is modified for coupling the surface loss model which is discrete with the implicit difference method in Hydrus-1D code. Two groups of published experiment data are used to verify our modified model. The results show that the related coefficients （r）, between forecasted results and observed data are no less than 0 |
| ISSN: | 1002-6819 |
| DOI: | 10.11975/j.issn.1002-6819.2016.04.019 |