In advective-dispersive simulations of aquifers, retardation factors using linear adsorption isotherms are commonly employed to represent the adsorption-desorption process for solutes in soil. In particular, the retardation factors that use entire pore space (total porosity) or effective pore space (effective porosity) are widely used. Although another retardation factor that describes solute transfer between mobile and immobile water in porous media has been developed, characteristics of the model have not been examined extensively. This retardation factor retains the ease of use and characteristics of the first two models; for example, its breakthrough curve is similar to those generated by models that employ total porosity for aquifers in which groundwater flow is fast and solute transport by advection and mechanical dispersion is predominant, as well as models that employ effective porosity for aquifers in which groundwater flow is slow, solute transport by molecular diffusion is predominant, and a large amount of adsorption-desorption occurs. It is therefore expected that when performing advective-dispersive simulations of aquifers with complex structures (e.g., aquifers in which sand and clay layers alternate), the reproducibility of the simulation results will be improved by using the retardation factor of this latter model, which considers solute transfer between mobile and immobile water.

在含水层的对流扩散模拟中，通常使用线性吸附等温线的延迟因子来表示土壤中溶质的吸附-解吸过程。特别地，广泛使用利用整个孔隙空间（总孔隙率）或有效孔隙空间（有效孔隙率）的延迟因子。尽管已开发出描述多孔介质中流动水与固定水之间溶质转移的另一种阻滞因子，但尚未广泛研究模型的特征。该延迟因子保留了前两个模型的易用性和特性。例如，其突破曲线类似于采用总孔隙率的含水层模型所产生的曲线，在该模型中，地下水流动迅速，而对流和机械分散作用主要是溶质运移，以及对地下水流动缓慢，溶质以分子扩散为主的含水层采用有效孔隙度的模型，并发生大量的吸附-解吸。因此，可以预期的是，当对结构复杂的含水层（例如，沙子和粘土层交替的含水层）进行对流扩散模拟时，通过使用后一种模型的延迟因子，可以提高模拟结果的可重复性。流动水和固定水之间的溶质转移。