Development of a groundwater flow and reactive solute transport model in the Yongding River alluvial fan, China

2019 ◽  
Vol 13 (2) ◽  
pp. 371-384 ◽  
Author(s):  
Haizhu Hu ◽  
Xiaomin Mao ◽  
Qing Yang
Keyword(s):  
Groundwater Flow ◽  
Solute Transport ◽  
Transport Model ◽  
Alluvial Fan ◽  
Reactive Solute Transport ◽  
The Yongding River ◽  
Yongding River

scholarly journals Testing and benchmarking of a three-dimensional groundwater flow and solute transport model

1988 ◽  
Author(s):  
P.N. Sims ◽  
P.F. Andersen ◽  
C.R. Faust ◽  
D.E. Stephenson
Keyword(s):  
Groundwater Flow ◽  
Solute Transport ◽  
Transport Model ◽  
Three Dimensional

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

2021 ◽  
Vol 25 (3) ◽  
pp. 1483-1508
Author(s):  
Alexander Sternagel ◽  
Ralf Loritz ◽  
Julian Klaus ◽  
Brian Berkowitz ◽  
Erwin Zehe
Keyword(s):  
Solute Transport ◽  
Reactive Transport ◽  
Preferential Flow ◽  
Transient Flow ◽  
Transport Model ◽  
Lagrangian Model ◽  
Retardation Factor ◽  
Soil Matrix ◽  
Reactive Solute Transport ◽  
Partially Saturated

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. The results demonstrate the feasibility of the method to simulate reactive solute transport in a Lagrangian framework and highlight the advantage of the particle-based approach and the structural macropore domain to simulate solute transport as well as to cope with preferential bypassing of topsoil and subsequent re-infiltration into the subsoil matrix.

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