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Solute transport through the integrated groundwater‐stream system of a catchment
Author(s) -
Lindgren G. A.,
Destouni G.,
Miller A. V.
Publication year - 2004
Publication title -
water resources research
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.863
H-Index - 217
eISSN - 1944-7973
pISSN - 0043-1397
DOI - 10.1029/2003wr002765
Subject(s) - advection , groundwater , hydrology (agriculture) , environmental science , groundwater flow , mass transfer , subsurface flow , soil science , aquifer , geology , mechanics , geotechnical engineering , physics , thermodynamics
We present a coupled groundwater‐stream model of catchment‐scale solute transport, using a Lagrangian stochastic advective‐sorptive travel time approach. We consider distributed solute input over an entire catchment and investigate the resulting stream solute breakthrough, subject to the possible solute spreading mechanisms: (1) variable groundwater advection and solute mass transfer between mobile and immobile groundwater zones and (2) in‐stream advection, mixing, and solute mass transfer between stream water and hyporheic zone. Among these mechanisms we show that fractal solute spreading over a wide timescale range is, for realistic parameter values, obtained in the stream only for the condition combination of both variable solute advection and solute mass transfer in the groundwater, with mean groundwater advection to mass transfer rate ratio that falls within a certain value range and with only a small fraction of solute input mass following fast overland and/or storm soil water flow to the stream.