Articles | Volume 26, issue 6
https://doi.org/10.5194/hess-26-1615-2022
https://doi.org/10.5194/hess-26-1615-2022
Research article
 | 
25 Mar 2022
Research article |  | 25 Mar 2022

Stepping beyond perfectly mixed conditions in soil hydrological modelling using a Lagrangian approach

Alexander Sternagel, Ralf Loritz, Brian Berkowitz, and Erwin Zehe

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Cited articles

Adams, R. E., Hyodo, A., SantaMaria, T., Wright, C. L., Boutton, T. W., and West, J. B.: Bound and mobile soil water isotope ratios are affected by soil texture and mineralogy, whereas extraction method influences their measurement, Hydrol. Process., 34, 991–1003, 2020. 
Allen, S. T. and Kirchner, J. W.: Potential effects of cryogenic extraction biases on inferences drawn from xylem water deuterium isotope ratios: case studies using stable isotopes to infer plant water sources, Hydrol. Earth Syst. Sci. Discuss. [preprint], https://doi.org/10.5194/hess-2020-683, 2021. 
Benettin, P., Nehemy, M. F., Asadollahi, M., Pratt, D., Bensimon, M., McDonnell, J. J., and Rinaldo, A.: Tracing and closing the water balance in a vegetated lysimeter, Water Resour. Res., 57, e2020WR029049, https://doi.org/10.1029/2020WR029049, 2021. 
Berkowitz, B., Cortis, A., Dentz, M., and Scher, H.: Modeling non-Fickian transport in geological formations as a continuous time random walk, Rev. Geophys., 44, RG2003, https://doi.org/10.1029/2005RG000178, 2006. 
Berkowitz, B., Dror, I., Hansen, S. K., and Scher, H.: Measurements and models of reactive transport in geological media, Rev. Geophys., 54, 930–986, 2016. 
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Short summary
We present a (physically based) Lagrangian approach to simulate diffusive mixing processes on the pore scale beyond perfectly mixed conditions. Results show the feasibility of the approach for reproducing measured mixing times and concentrations of isotopes over pore sizes and that typical shapes of breakthrough curves (normally associated with non-uniform transport in heterogeneous soils) may also occur as a result of imperfect subscale mixing in a macroscopically homogeneous soil matrix.