Details
| Original language | English |
|---|---|
| Pages (from-to) | 621-630 |
| Number of pages | 10 |
| Journal | Journal of hydrology |
| Volume | 509 |
| Publication status | Published - 13 Feb 2014 |
Abstract
The interface geometry of freshwater lenses in layered aquifers was investigated by physical 2D laboratory experiments. The resulting steady-state geometries of the lenses were compared to existing analytical expressions from Dupuit-Ghyben-Herzberg (DGH) analysis of strip-island lenses for various cases of heterogeneity. Despite the vertical exaggeration of the physical models, which would seem to vitiate the assumption of vertical equipotentials, the fits with the DGH models were generally satisfactory. Observed deviations between the analytical and physical models can be attributed mainly to outflow zones along the shore line, which are not considered in the analytical models. As unconfined natural lenses have small outflow zones compared to their overall dimensions, and flow is mostly horizontal, the DGH analytical models should perform even better at full scale. Numerical models that do consider the outflow face generally gave a good fit to the physical models.
Keywords
- Freshwater lens, Interface, Layered aquifer, Physical model, Variable-density flow
ASJC Scopus subject areas
- Environmental Science(all)
- Water Science and Technology
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In: Journal of hydrology, Vol. 509, 13.02.2014, p. 621-630.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - Experiments and modeling of freshwater lenses in layered aquifers
T2 - Steady state interface geometry
AU - Dose, Eduardo J.
AU - Stoeckl, Leonard
AU - Houben, Georg J.
AU - Vacher, H. L.
AU - Vassolo, Sara
AU - Dietrich, Jörg
AU - Himmelsbach, Thomas
PY - 2014/2/13
Y1 - 2014/2/13
N2 - The interface geometry of freshwater lenses in layered aquifers was investigated by physical 2D laboratory experiments. The resulting steady-state geometries of the lenses were compared to existing analytical expressions from Dupuit-Ghyben-Herzberg (DGH) analysis of strip-island lenses for various cases of heterogeneity. Despite the vertical exaggeration of the physical models, which would seem to vitiate the assumption of vertical equipotentials, the fits with the DGH models were generally satisfactory. Observed deviations between the analytical and physical models can be attributed mainly to outflow zones along the shore line, which are not considered in the analytical models. As unconfined natural lenses have small outflow zones compared to their overall dimensions, and flow is mostly horizontal, the DGH analytical models should perform even better at full scale. Numerical models that do consider the outflow face generally gave a good fit to the physical models.
AB - The interface geometry of freshwater lenses in layered aquifers was investigated by physical 2D laboratory experiments. The resulting steady-state geometries of the lenses were compared to existing analytical expressions from Dupuit-Ghyben-Herzberg (DGH) analysis of strip-island lenses for various cases of heterogeneity. Despite the vertical exaggeration of the physical models, which would seem to vitiate the assumption of vertical equipotentials, the fits with the DGH models were generally satisfactory. Observed deviations between the analytical and physical models can be attributed mainly to outflow zones along the shore line, which are not considered in the analytical models. As unconfined natural lenses have small outflow zones compared to their overall dimensions, and flow is mostly horizontal, the DGH analytical models should perform even better at full scale. Numerical models that do consider the outflow face generally gave a good fit to the physical models.
KW - Freshwater lens
KW - Interface
KW - Layered aquifer
KW - Physical model
KW - Variable-density flow
UR - http://www.scopus.com/inward/record.url?scp=84892954092&partnerID=8YFLogxK
U2 - 10.1016/j.jhydrol.2013.10.010
DO - 10.1016/j.jhydrol.2013.10.010
M3 - Article
AN - SCOPUS:84892954092
VL - 509
SP - 621
EP - 630
JO - Journal of hydrology
JF - Journal of hydrology
SN - 0022-1694
ER -