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多孔介质期刊
影响因子: 1.49 5年影响因子: 1.159 SJR: 0.43 SNIP: 0.671 CiteScore™: 1.58

ISSN 打印: 1091-028X
ISSN 在线: 1934-0508

多孔介质期刊

DOI: 10.1615/JPorMedia.v18.i12.20
pages 1181-1186

MODELING CONTAMINANT TRANSPORT IN SATURATED SOIL COLUMN WITH THE CONTINUOUS TIME RANDOM WALK

Shahram Shahmohammadi-Kalalagh
Department of Water Sciences and Engineering, Tabriz Branch, Islamic Azad University, Tabriz, Iran

ABSTRACT

In this paper, we evaluate the continuous time random walk (CTRW) theory for its capability to characterize solute and contaminant transport in one-dimensional saturated homogeneous soil column at the experiments conducted by Shiozawa (cited in Toride, N., Leij, F., and van Genuchten, M. Th., The CXTFIT Code for Estimating Transport Parameters from Laboratory or Field Tracer Experiments, Version 2.1, Research Rep. 137, US Salinity Lab, Riverside, CA, 1999). The transport process was also simulated by using the advection-dispersion equation (ADE) for comparison. The non-Fickian behavior is found at distances less than 11 cm with β value of 1.909, and Fickian form transport is obtained at distances larger than 11 cm with β values larger than 2. Comparing to ADE the CTRW gives better fits to the breakthrough curves (BTCs), with lower values of root mean square error (RMSE) and higher values of determination coefficient (r2). The CTRW captures the full evolution of BTCs, and especially at the early part of the breakthrough curves. Therefore, it seems that the CTRW can be used as an appropriate approach to simulate the solute transport in a saturated homogeneous soil column.


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