In the stream-aquifer setting entered by nonpoint source contaminants, numerical simulation analyses for the coupled advection-dispersion and Richards equations were performed to evaluate and quantify the impacts of transport controlling factors on the relationship between average concentration of saturated aquifer <Cs(t)> and groundwater outflow concentration <Cq(t)>, and on the dynamic responses of <Cs(t)> and <Cq(t)> variables. As compared to the previous studies, the unique features of this study were to include unsaturated flow effect and to provide the physical basis and quantification for the <Cs(t)>—<Cq(t)> relationship. Numerical simulation results showed that <Cs(t)> —<Cq(t)> relations exhibited nonlinear, looping behaviour and were sensitive to the changes of dispersivity and aquifer thickness parameters. Furthermore, <Cs(t)> and <Cq(t)> responses were significantly affected by these two factors of dispersivity and aquifer thickness. For unsaturated-saturated flow condition, the significant impact of dispersivity values on the groundwater outflow concentration response <Cq(t)> might have an important implication for modeling the <Cq(t)> responses.
Determining the relationship between average concentration of saturated aquifer and groundwater outflow subject to nonpoint source contaminants
KSCE J Civ Eng
KSCE Journal of Civil Engineering ; 2 , 2 ; 137-152
1998-06-01
16 pages
Article (Journal)
Electronic Resource
English
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