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Simulation of reactive solute transport in the critical zone: A Lagrangian model for transient flow and preferential transport

Sternagel, Alexander ORCID iD icon; Loritz, Ralf; Klaus, Julian; Berkowitz, Brian; Zehe, Erwin

Abstract:

We present a method to simulate fluid flow with reactive solute transport in structured, partially saturated soils using a Lagrangian perspective. In this context, we extend the scope of the Lagrangian Soil Water and Solute Transport Model (LAST) (Sternagel et al., 2019) by implementing vertically variable, non-linear sorption and first-order degradation processes during transport of reactive substances through a partially saturated soil matrix and macropores. For sorption, we develop an explicit mass transfer approach based on Freundlich isotherms because the common method of using a retardation factor is not applicable in the particle-based approach of LAST. The reactive transport method is tested against data of plot- and field-scale irrigation experiments with the herbicides isoproturon and flufenacet at different flow conditions over various periods. Simulations with HYDRUS 1-D serve as an additional benchmark. At the plot scale, both models show equal performance at a matrix-flow-dominated site, but LAST better matches indicators of preferential flow at a macropore-flow-dominated site. Furthermore, LAST successfully simulates the effects of adsorption and degradation on the breakthrough behaviour of flufenacet with preferential leaching and remobilization. ... mehr

Zugehörige Institution(en) am KIT Institut für Wasser und Gewässerentwicklung (IWG)
KIT-Zentrum Klima und Umwelt (ZKU)
Publikationstyp Zeitschriftenaufsatz
Publikationsjahr 2021
Sprache Englisch
Identifikator ISSN: 1027-5606, 1607-7938
KITopen-ID: 1000131137
Erschienen in Hydrology and Earth System Sciences
Verlag Copernicus Publications
Band 25
Heft 3
Seiten 1483-1508
Bemerkung zur Veröffentlichung Gefördert durch den KIT-Publikationsfonds
Nachgewiesen in Scopus
Web of Science
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Verlagsausgabe §
DOI: 10.5445/IR/1000131137
Veröffentlicht am 12.04.2021
Originalveröffentlichung
DOI: 10.5194/hess-25-1483-2021
Scopus
Zitationen: 6
Web of Science
Zitationen: 6
Dimensions
Zitationen: 9
Seitenaufrufe: 392
seit 12.04.2021
Downloads: 176
seit 15.04.2021
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