Anomalous transport of colloids and solutes in a shear zone

Journal of Contaminant Hydrology
Georg Kosakowski

Abstract

Transport experiments with colloids and radionuclides in a shear zone were conducted during the Colloid and Radionuclide Retardation experiment (CRR) at Nagra's Grimsel Test Site. Breakthrough curves of bentonite colloids and uranine, a non-sorbing solute, were measured in an asymmetric dipole flow field. The colloid breakthrough is earlier than that of uranine. Both breakthrough curves show anomalously long late time tails and the slope of the late time tails for the colloids is slightly higher. Anomalous late time tails are commonly associated with matrix diffusion processes; the diffusive interaction of solutes transported in open channels with the adjacent porous rock matrix or zones of stagnant water. The breakthrough curves for different colloid size classes are very similar and show no signs of fractionation due to their (size-dependent) diffusivity. It is proposed that tailing of the colloids is mainly caused by the structure of the flow field and that for the colloid transport, matrix diffusion is of minor importance. This has consequences for the interpretation of the uranine breakthrough. Comparisons of experimental results with numerical studies and with the evaluation of the colloid breakthrough with continuous tim...Continue Reading

References

Apr 5, 2001·Journal of Contaminant Hydrology·G KosakowskiH Scher
Jun 20, 2003·Journal of Contaminant Hydrology·Melissa Levy, Brian Berkowitz
Nov 11, 2003·Journal of Contaminant Hydrology·Ivan LunatiIvan Sørensen

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Citations

Dec 5, 2013·Journal of Contaminant Hydrology·Hongguang SunDonald M Reeves
Dec 30, 2014·Journal of Contaminant Hydrology·Jung-Woo KimJongtae Jeong
Apr 7, 2010·Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics·Harvey ScherBrian Berkowitz
Feb 28, 2009·Environmental Science & Technology·Vishal GuptaT Rauch-Williams

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