Effect of nonlinear sorption on multispecies radionuclide transport in a coupled fracture-matrix system with variable fracture aperture: A numerical study

被引：0

作者：

Bagalkot, Nikhil ^{[1
]}

Kumar, G. Suresh ^{[1
]}

机构：

[1] Department of Ocean Engineering, Indian Institute of Technology Madras, Chennai

来源：

ISH Journal of Hydraulic Engineering | 2015年 / 21卷 / 03期

关键词：

coupled PDE; fracture-matrix system; multispecies radionuclide; nonlinear sorption; numerical modeling; variable aperture;

D O I：

10.1080/09715010.2015.1016125

中图分类号：

学科分类号：

摘要：

A one-dimensional numerical analysis on multispecies radionuclide transport in a single-horizontal coupled fracture-matrix system has been performed. Analysis considering linear and nonlinear adsorption cases with linear, Langmuir, and Freundlich adsorption models has been carried out. The results indicate that there is a significant change in the spatial distribution of radionuclides in a coupled fracture-matrix system when a nonlinear adsorption isotherm is considered as compared to the simplified linear sorption isotherm. Sensitivity analysis of Langmuir constant and Freundlich exponent has been performed, and the numerical results indicate that the behavior of radionuclide transport is strongly influenced by these nonlinear sorption isotherm parameters. In addition, an attempt has been made to consider the variation of fracture aperture thickness along its flow direction by introducing logarithmic distribution. A clear distinction in the spatial distribution of radionuclide concentration was observed when variable fracture aperture is considered as opposed to the conventional parallel plate model with a constant fracture aperture thickness. Further, the results suggest that there is an enhanced retardation of radionuclides within the high permeable fracture with varying fracture aperture. © 2015 Indian Society for Hydraulics.

引用

页码：242 / 254

页数：12

共 35 条

[1]

Abdel-Salam A., Chrysikopoulos C.V., Analysis of a model for contaminant transport in fractured media in the presence of colloids, J. Hydrol., 165, 1, pp. 261-281, (1995)

[2]

Abulaban A., Nieber J.L., Misra D., Modeling plume behavior for nonlinearly sorbing solutes in saturated homogeneous porous media, Adv. Water Resour., 21, 6, pp. 487-498, (1998)

[3]

Bauer P., Attinger S., Kinzelbach W., Transport of a decay chain in homogenous porous media: Analytical solutions, J. Contam. Hydrol., 49, 3, pp. 217-239, (2001)

[4]

Bodin J., Delay F., De Marsily G., Solute transport in a single fracture with negligible matrix permeability: 1. Fundamental mechanisms, Hydrogeol. J., 11, 4, pp. 418-433, (2003)

[5]

Chrysikopoulos C.V., Abdel-Salam A., Modeling colloid transport and deposition in saturated fractures, Colloids Surf. A: Physicochem. Eng. Aspects, 121, 2, pp. 189-202, (1997)

[6]

Cunningham J.A., Werth C.J., Reinhard M., Roberts P.V., Effects of grain-scale mass transfer on the transport of volatile organics through sediments: 1. Model development, Water Resour. Res., 33, 12, pp. 2713-2726, (1997)

[7]

Feder J., Fractals., (1988)

[8]

Grenthe I., Hummel W., Puigdomenech I., Chapter III chemical background for the modelling of reactions in aqueous systems, Modelling in Aquatic Chemistry, pp. 69-129, (1997)

[9]

Grisak G.E., Pickens J.F., Solute transport through fractured media: 1. The effect of matrix diffusion, Water Resour. Res., 16, 4, pp. 719-730, (1980)

[10]

Hakami E., Barton N., Aperture measurements and flow experiments using transparent replicas of rock joints, Proceedings of the Int, Symposium on Rock Joints, pp. 383-390, (1990)

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