Tide-topography interactions: the influence of an along-shelf current on the internal wave spectrum
Bibliographic record
Abstract
We investigate the influence of a barotropic geostrophic current on the internal wave (IW) generation over a shelf slope. It is well known that most of the energy in the tide-topography generated waves lies in waves with tidal frequency $\sigma_T$. Here we restrict our attention on the frequencies other than the dominant frequency $\sigma_T$. The current $V_g(x)$ is modeled as an idealized Gaussian function centered at $x_0$ with width $x_r$ and maximum velocity $V_{max}$. The bathymetry is modelled as a linear slope with smoothed corners. Since the center of the current lies on the slope, there will always be a region on the slope where the effective frequency $f_{eff}$ is greater than the Coriolis parameter $f$ and another region where $f_{eff} < f$. Parametric subharmonic instability (PSI) occurs where waves with approximately half of the primary wave frequency, in this case $\sigma_T/2$, are generated. In the presence of a large current, PSI can occur where $f_{eff} < \sigma_T/2 < f$. This could not happen without a current, i.e. $f_{eff} = f > \sigma_T/2$. Other interesting interactions, including interharmonics and strong tidal harmonics, are also observed.
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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 | 0.001 |
| Bibliometrics | 0.000 | 0.000 |
| Science and technology studies | 0.000 | 0.001 |
| Scholarly communication | 0.001 | 0.001 |
| Open science | 0.000 | 0.001 |
| Research integrity | 0.001 | 0.001 |
| Insufficient payload (model declined to judge) | 0.006 | 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".