Journal
TRANSPORT IN POROUS MEDIA
Volume 89, Issue 3, Pages 289-306Publisher
SPRINGER
DOI: 10.1007/s11242-011-9772-3
Keywords
Averaging theory; Tidal fluctuation; Reduction of dimensionality; Mass transfer; Tidal mixing process
Categories
Funding
- E. I. du Pont de Nemours and Company
Ask authors/readers for more resources
Data from an one-dimensional homogeneous sand column, which is utilized to investigate the effect of tides on the concentration of groundwater contaminants discharging to a surface-water body, demonstrate that the tidal fluctuations in water level elevation create concentration oscillations upgradient of the groundwater discharge locations and there is a resulting decrease in average contaminant concentration at the point of groundwater discharge to a surface-water body. The further upgradient an observation point is located, the smaller the amplitude of the tidally induced concentration oscillations. In addition, an excessive upstream migration of concentration oscillations is observed although there is a net downgradient flow. As the classical groundwater flow and transport model could not reproduce this phenomena, a multi-mobility model is proposed with one highly mobile liquid phase, one less mobile liquid phase and a solid phase. Averaging theory is applied in a first step to develop the macroscopic mass conservation equation from its microscale counterpart and then, in a second step, averaging is again used to reduce dimensionality to one-dimensional governing equations defined along the axis of the column. The simulation confirms the existence of an enhanced tidally induced mixing process and the suitability of our mathematical-physical representation of it.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available