Evolution of initially axisymmetric buoyancy jets: a numerical study
Bibliographic record
Abstract
Baroclinic evolution of coastal currents associated with a surface front over variable topography is investigated numerically, employing a two-layer frontal-geostrophic model. In the frontal-geostrophic dynamical limit the frontal layer velocity is geostrophic to leading order; however the advective terms from the momentum equation are accounted for in the leading-order balance, and the mass conservation equation includes both the temporal and advective contributions. In this study, special focus is placed on the role of topography and the development of coherent vortex features. Perturbed axisymmetric currents in an annular domain are seen to develop typical breaking-wave instabilities at the outside edge. In general, the topography is found to be a destabilizing influence; however very steep topography is shown to inhibit cross-front motions, and thus delay subsequent vortex shedding. In simulations involving a continuous source of buoyant fluid, the ambient layer exhibits a marked increase in anticyclonic vorticity, which prevents eddy pinch-off. The results are compared with previous laboratory experiments involving surface currents, and implications for the stability of fronts at a shelf break are discussed.
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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 | 0.002 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.001 | 0.000 |
| Science and technology studies | 0.001 | 0.001 |
| Scholarly communication | 0.001 | 0.001 |
| Open science | 0.001 | 0.000 |
| Research integrity | 0.001 | 0.001 |
| Insufficient payload (model declined to judge) | 0.001 | 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".