Coherent structures in urban roughness sublayer turbulence
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Bibliographic record
Abstract
Abstract Data measured within and above an urban street canyon is used to analyse the importance of coherent structures in turbulent transfer. The atmosphere was probed simultaneously at six different heights from the base of the street canyon up to 2.2 times the mean building height. Integral length scales, joint probability densities, quadrant measures and wavelet‐based conditional sampling techniques are used to picture momentum and sensible heat exchange in the urban roughness sublayer. Layers directly at roof height show smallest length scales. With increasing distance from roofs, length scales increase, both up to higher levels above the roofs and also down to the base of the street canyon. Quadrant analysis indicates that turbulent momentum and sensible heat fluxes are strongly sweep‐dominated in large parts of the street canyon and close to the roofs. Only at the highest measurement levels do ejections slightly dominate exchange. Exchange is intermittent where length scales are largest, namely in the lower street canyon and at higher levels in the urban roughness sublayer. At rooftop, exchange is more efficient and least intermittent. A wavelet‐based detection is used to reconstruct time‐height cross‐sections of paired events measured at multiple levels simultaneously. Two types of sharp scalar fronts were identified—sweeps followed by ejections and ejections followed by sweeps. Both are important in transporting momentum and sensible heat. Copyright © 2007 Royal Meteorological Society
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Full frame distilled prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. Learned from the 10,348 direct Codex labels and 10,348 direct Gemma labels. Candidate is the union of thresholded teacher heads; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels or direct frontier model labels.
Codex and Gemma teacher scores by category
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.000 | 0.000 |
| 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 | 0.000 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| 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 it