Evidence of compound-dependent hydrodynamic and mechanical transverse dispersion by multitracer laboratory experiments

Environmental Science & Technology
Gabriele ChiognaMassimo Rolle

Abstract

Mass transfer, mixing, and therefore reaction rates during transport of solutes in porous media strongly depend on dispersion and diffusion. In particular, transverse mixing is a significant mechanism controlling natural attenuation of contaminant plumes in groundwater. The aim of the present study is to gain a deeper understanding of vertical transverse dispersive mixing of reaction partners in saturated porous media. Multitracer laboratory experiments in a quasi two-dimensional tank filled with glass beads were conducted and transverse dispersion coefficients were determined from high-resolution vertical concentration profiles. We investigated the behavior of conservative tracers (i.e., fluorescein, dissolved oxygen, and bromide), with different aqueous diffusion coefficients, in a range of grain-related Peclet numbers between 1 and 562. The experimental results do not agree with the classical linear parametric model of hydrodynamic dispersion, in which the transverse component is approximated as the sum of pore diffusion and a compound-independent mechanical dispersion term. The outcome of the multitracer experiments clearly indicates a nonlinear relation between the dispersion coefficient and the average linear velocity. Mo...Continue Reading

Citations

Jun 12, 2012·Environmental Science & Technology·Boris M Van Breukelen, Massimo Rolle
Dec 3, 2014·Journal of Contaminant Hydrology·Donato CitarellaAndrea Zanini
Nov 20, 2012·Journal of Contaminant Hydrology·Murat Savas SariogluNadim K Copty
Nov 20, 2012·Journal of Contaminant Hydrology·David L Hochstetler, Peter K Kitanidis
Jul 13, 2012·Journal of Contaminant Hydrology·Stéphanie Loyaux-LawniczakPhilippe Ackerer
Jul 17, 2012·Journal of Contaminant Hydrology·Olaf A CirpkaWolfgang Nowak
Feb 15, 2013·Ground Water·Christina M HabererPeter Grathwohl
Dec 18, 2013·Ground Water·Christina M HabererPeter Grathwohl
Dec 3, 2014·Journal of Contaminant Hydrology·Laura B CribbinGraham C Sander
Nov 21, 2015·Physical Review Letters·Yu YeMassimo Rolle
Jul 16, 2017·Physical Review. E·Dzmitry HlushkouUlrich Tallarek

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