Hydrology and Water Resources, School of Earth and Environmental Sciences, University of Arizona, 429 Shantz Building, Tucson, AZ 85721, USA.
J Contam Hydrol. 2011 Apr 25;123(3-4):104-13. doi: 10.1016/j.jconhyd.2010.12.011. Epub 2011 Jan 1.
The efficacy of a simple mass-removal function for characterizing mass-flux-reduction/mass-removal behavior for organic-liquid contaminated source zones was evaluated using the data obtained from a series of flow-cell experiments. The standard function, which employs a constant exponent, could not adequately reproduce the non-singular (multi-step) behavior exhibited by the measured data. Allowing the exponent to change as a function of mass removal (as the organic-liquid distribution and relative permeability change) produced non-singular relationships similar to those exhibited by the measured data. Four methods were developed to dynamically inform the exponent through use of measurable system-indicator parameters. Key factors that mediate the magnitude of mass flux (dilution and source accessibility) were accounted for using measures of source zone cross-sectional area, ganglia-to-pool (GTP) ratio, and relative permeability. The two methods that incorporated only the ganglia-to-pool ratio produced adequate simulations of the observed behavior for early stages of mass removal, but not for later stages. The method that incorporated parameters accounting for the source zone cross-sectional area (i.e., measure of system dilution) and source accessibility (GTP ratio and relative permeability) provided the most representative simulations of the observed data.
采用一系列流动池实验获得的数据，评估了一种简单的质量去除函数在描述有机液体污染源区质量通量减少/去除行为方面的功效。标准函数采用常数指数，无法充分再现测量数据表现出的非奇异（多步骤）行为。允许指数随质量去除而变化（因为有机液体分布和相对渗透率发生变化），可产生与测量数据相似的非奇异关系。通过使用可测量的系统指示参数，开发了四种方法来动态告知指数。使用源区横截面面积、丛到池（GTP）比和相对渗透率等措施，考虑了调节质量通量大小（稀释和源区可及性）的关键因素。仅包含丛到池比的两种方法对质量去除早期阶段的观察到的行为进行了充分的模拟，但对后期阶段的模拟则不然。包含考虑源区横截面面积（即系统稀释的度量）和源区可及性（GTP 比和相对渗透率）参数的方法为观察到的数据提供了最具代表性的模拟。
