Dispersion of a fluid plume during radial injection in an aquifer
Bibliographic record
Abstract
This study outlines a model for radial injected fluid flow with mechanical dispersion in a vertically confined porous aquifer. Existing studies have investigated fully segregated fluid flows in this setting, where the injected fluid and resident fluid form a propagating sharp interface. The present study uses the geometry of these sharp interfaces as a basis for the velocity field to take into account dispersion and buoyancy/viscosity effects. By differentiating the radial position of the sharp interface with respect to time, a time dependent radial velocity field governing the flow is obtained. Evaluating this radial velocity at the moment the original interface were to intersect a given position gives a velocity field that is a function of the position coordinates inside the aquifer. Using this velocity field, the fluids saturation profile resulting from mechanical dispersion can be found analytically. It is shown that the concentration of the injected fluid smoothly decays around the position of the corresponding sharp interface, allowing for the injected fluid to be present in detectable quantities beyond the extent of these solutions. This concentration spread should be considered in defining outer boundaries on fluids in injection well projects such as carbon sequestration or groundwater applications.
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How this classification was reachedexpand
Full frame machine prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. The Gemma side is a direct model label for every work in the frame, read from the title-only record. The Codex side is a classifier learned from the 10,348 direct Codex labels and calibrated to design-weighted sample rates; fields without enough sample support carry no Codex call. Candidate is the union of the two sides; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels.
Distilled classifier scores by category (both heads)
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.000 | 0.001 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.000 | 0.000 |
| Science and technology studies | 0.000 | 0.001 |
| Scholarly communication | 0.001 | 0.001 |
| Open science | 0.001 | 0.001 |
| Research integrity | 0.001 | 0.000 |
| Insufficient payload (model declined to judge) | 0.000 | 0.000 |
Machine scores (provisional)
The two teacher heads of the student model, read on this work. A score orders the frame for review; it never asserts a category, and the validation status ships verbatim with every row.
Baseline scores from an immature model (maturity gate not passed, 7 training rounds). Scores rank; they never assert a category.
score_only:v0-immature-baseline · verbatim from the scoring run: score_only means the number may rank works, and no category label ships from itClassification
machine, unvalidatedMachine predicted; a candidate call from one source (direct Gemma or distilled Codex), not a consensus.
How this classification was reached, model by model and score by score, is at the end of the page under "How this classification was reached".