Generation of dense plume fingers in saturated–unsaturated homogeneous porous media
| Autor: | Clemens Cremer, Thomas Graf |
|---|---|
| Rok vydání: | 2015 |
| Předmět: |
Chemical Phenomena
Mechanics Models Theoretical Perturbation (geology) humanities Plume Solutions Flow conditions Water Movements Environmental Chemistry Geotechnical engineering Saltwater intrusion Porous medium Groundwater model Groundwater Porosity Specific Gravity Geothermal gradient Water Pollutants Chemical Geology Water Science and Technology |
| Zdroj: | Journal of Contaminant Hydrology. 173:69-82 |
| ISSN: | 0169-7722 |
| Popis: | Flow under variable-density conditions is widespread, occurring in geothermal reservoirs, at waste disposal sites or due to saltwater intrusion. The migration of dense plumes typically results in the formation of vertical plume fingers which are known to be triggered by material heterogeneity or by variations in source concentration that causes the density variation. Using a numerical groundwater model, six perturbation methods are tested under saturated and unsaturated flow conditions to mimic heterogeneity and concentration variations on the pore scale in order to realistically generate dense fingers. A laboratory-scale sand tank experiment is numerically simulated, and the perturbation methods are evaluated by comparing plume fingers obtained from the laboratory experiment with numerically simulated fingers. Dense plume fingering for saturated flow can best be reproduced with a spatially random, time-constant perturbation of the solute source. For unsaturated flow, a spatially and temporally random noise of solute concentration or a random conductivity field adequately simulate plume fingering. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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