A simple one-dimensional heterogeneous-source model was used to simulate dissolution of organic liquid that was non-uniformly distributed in physically heterogeneous porous media. The permeability field was depicted as a pseudo-homogeneous medium. The source zone was discretized into multiple domains representing different organic-liquid configurations and hydraulic accessibilities, each with a different representative upscaled mass transfer rate coefficient that is temporally variable. This simplified approach represents a system where minimal information is available regarding system heterogeneities. All factors that influence dissolution were incorporated into the calibrated mass transfer terms. The mass transfer terms were calibrated for each zone separately. The one-dimensional, heterogeneous-source model adequately simulated the multi-stage dissolution behavior observed for column-scale systems that were packed with different natural soils, as well as for flow-cell systems wherein the source zone consisted of both a residual zone and pool. The results indicate that the model adequately simulated the presence of multiple organic-liquid zones in porous media with different configurations and hydraulic accessibilities, which accounts for the non-ideal dissolution behavior observed. The calibrated mass transfer terms for each source type were consistent with those obtained for systems that contained only one of either source type.

一个简单的一维非均质源模型用于模拟非均匀分布在物理非均质多孔介质中的有机液体的溶解。渗透场被描述为一个伪均质介质。源区被离散成多个域，代表不同的有机液体配置和水力可及性，每个域具有不同的代表性放大传质速率系数，该系数随时间变化。这种简化的方法代表了一个系统，其中关于系统异质性的信息最少。所有影响溶解的因素都被纳入校准的传质项中。对每个区域分别校准传质项。一维的，非均质源模型充分模拟了在填充不同天然土壤的柱状系统以及源区由残留区和池组成的流动池系统中观察到的多阶段溶解行为。结果表明，该模型充分模拟了具有不同配置和水力可达性的多孔介质中多个有机-液体区的存在，这解释了观察到的非理想溶解行为。每种源类型的校准传质项与仅包含任一源类型之一的系统获得的结果一致。以及其中源区由残留区和池组成的流通池系统。结果表明，该模型充分模拟了具有不同配置和水力可达性的多孔介质中多个有机-液体区的存在，这解释了观察到的非理想溶解行为。每种源类型的校准传质项与仅包含任一源类型之一的系统获得的结果一致。以及其中源区由残留区和池组成的流通池系统。结果表明，该模型充分模拟了具有不同配置和水力可达性的多孔介质中多个有机-液体区的存在，这解释了观察到的非理想溶解行为。每种源类型的校准传质项与仅包含任一源类型之一的系统获得的结果一致。