On the validity of travel-time based nonlinear bioreactive transport models in steady-state flow

Journal of Contaminant Hydrology
Alicia Sanz-PratOlaf A Cirpka

Abstract

Travel-time based models simplify the description of reactive transport by replacing the spatial coordinates with the groundwater travel time, posing a quasi one-dimensional (1-D) problem and potentially rendering the determination of multidimensional parameter fields unnecessary. While the approach is exact for strictly advective transport in steady-state flow if the reactive properties of the porous medium are uniform, its validity is unclear when local-scale mixing affects the reactive behavior. We compare a two-dimensional (2-D), spatially explicit, bioreactive, advective-dispersive transport model, considered as "virtual truth", with three 1-D travel-time based models which differ in the conceptualization of longitudinal dispersion: (i) neglecting dispersive mixing altogether, (ii) introducing a local-scale longitudinal dispersivity constant in time and space, and (iii) using an effective longitudinal dispersivity that increases linearly with distance. The reactive system considers biodegradation of dissolved organic carbon, which is introduced into a hydraulically heterogeneous domain together with oxygen and nitrate. Aerobic and denitrifying bacteria use the energy of the microbial transformations for growth. We analyze ...Continue Reading

References

Jul 13, 2002·Ground Water·Craig M Bethke, Thomas M Johnson
Oct 29, 2002·Journal of Contaminant Hydrology·Olaf A Cirpka
Nov 18, 2008·Journal of Contaminant Hydrology·John Maximilian KöhneJirka Simůnek
Jul 17, 2012·Journal of Contaminant Hydrology·Olaf A CirpkaWolfgang Nowak

Citations

Feb 6, 2016·Journal of Contaminant Hydrology·Alicia Sanz-PratOlaf A Cirpka

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