非饱和带溶质迁移离心模拟的可行性研究

Study on the Feasibility of Centrifugal Modeling of Solute Transport within the Unsaturated Zone

通过开发离心状态下非饱和带溶质迁移一维数值模型,对离心模拟技术用于不同溶质在非饱和带迁移规律研究的可行性进行了探讨。结果表明:(1)离心模拟技术可适用于保守性溶质和吸附瞬时平衡溶质的迁移规律研究;(2)针对有物理或化学过程的非饱和带溶质迁移,当丹姆尔数DR>100(反应迅速)或0<DR<X(反应缓慢)时,离心模拟技术是可行的;(3)对于有溶质B生成的溶质A在非饱和带的迁移,当反应较慢时,离心模拟能成功预测A的迁移,但对B的预测误差较大。若B是研究重点,则离心模拟不可行;若B不重要,则离心模拟是适用的。

One-dimensional numerical models of solute transport in unsaturated zone under the centrifugal condition were firstly developed.Then those models were applied to study the feasibility of applying centrifugal modeling to simulate the transport of different types of solute.The results showed:(1)it is feasible to conduct centrifugal modeling for studying nonreactive solute transport and solute transport with instantaneous equilibrium adsorption in unsaturated zone;(2)for the solute transport with physical or chemical reaction,if D R>100(very rapid)or 0<D R<X(very slow),the centrifugal modeling is feasible;(3)for the transport of reactive solute A with product B generated,if the reaction process is slow,the prediction of A can well match the prototype.But the prediction error of B is very large,with the concentration error up to 2 orders of magnitude.If B is also a focus,the centrifugal modeling is not worthy of recommendation.And if B is not so important,the centrifugal modeling is feasible under the appropriate condition.