土壤溶质迁移的两区模型与两流区模型对比分析

Analysis of two-region model and two-flow domain model for soil solute transport

本文在分析描述土壤溶质迁移的两流区与两区模型的区别与联系的基础上,利用连续和脉冲输入情况下的试验资料对两区和两流区模型的预测能力进行了比较和分析。结果表明,与两区模型相比,两流区模型可以更好地描述优先流情况下的溶质穿透曲线。对于无优先流情况,两个模型预测结果基本相同。通过在无优先流情况下两个模型参数间关系的分析发现,在连续流输入情况下两个模型的参数一致性较好,而在脉冲输入时一致性较差。

Based on the analysis on the relationship between the two-region model and two-flow domain model for soil solute transport, the prediction functions of these two models are compared by the experimental data obtained from continuous input test and pulse input test. The result shows that the two-flow domain model is better than the two-region model in describing the breakthrough curve in case preferential flow is existed, but there is no difference between the predictions of these models if without preferential flow. The analysis on the relationship between the parameters of these models under the condition of without preferential flow shows that they are identical for continuous input but remarkably different for pulse input.