Publication Details

Category Text Publication
Reference Category Journals
DOI 10.1016/j.jhydrol.2015.09.006
Title (Primary) An exploration of coupled surface–subsurface solute transport in a fully integrated catchment model
Author Liggett, J.E.; Partington, D.; Frei, S.; Werner, A.D.; Simmons, C.T.; Fleckenstein, J.H.
Source Titel Journal of Hydrology
Year 2015
Department HDG
Volume 529
Page From 969
Page To 979
Language englisch
Keywords Solute transport; Surface–subsurface coupling; Integrated modelling; Catchment modelling
UFZ wide themes RU2;
Abstract Coupling surface and subsurface water flow in fully integrated hydrological codes is becoming common in hydrological research; however, the coupling of surface–subsurface solute transport has received much less attention. Previous studies on fully integrated solute transport focus on small scales, simple geometric domains, and have not utilised many different field data sources. The objective of this study is to demonstrate the inclusion of both flow and solute transport in a 3D, fully integrated catchment model, utilising high resolution observations of dissolved organic carbon (DOC) export from a wetland complex during a rainfall event. A sensitivity analysis is performed to span a range of transport conditions for the surface–subsurface boundary (e.g. advective exchange only, advection plus diffusion, advection plus full mechanical dispersion) and subsurface dispersivities. The catchment model captures some aspects of observed catchment behaviour (e.g. solute discharge at the catchment outlet, increasing discharge from wetlands with increased stream discharge, and counter-clockwise concentration–discharge relationships), although other known behaviours are not well represented in the model (e.g. slope of concentration–discharge plots). Including surface–subsurface solute transport aids in evaluating internal model processes, however there are challenges related to the influence of dispersion across the surface–subsurface interface, and non-uniqueness of the solute transport solution. This highlights that obtaining solute field data is especially important for constraining integrated models of solute transport.
Persistent UFZ Identifier https://www.ufz.de/index.php?en=20939&ufzPublicationIdentifier=16666
Liggett, J.E., Partington, D., Frei, S., Werner, A.D., Simmons, C.T., Fleckenstein, J.H. (2015):
An exploration of coupled surface–subsurface solute transport in a fully integrated catchment model
J. Hydrol. 529 , 969 - 979 10.1016/j.jhydrol.2015.09.006