Coherent flow structures and suspension events over low-angle dunes: Fraser River, Canada
Bibliographic record
Abstract
It is increasingly obvious that dunes with low-angle lee-sides (< 30°) are the most common bedform morphology in large sand-bedded alluvial channels. Flume studies have revealed much about flow and sediment dynamics over high-angle (~30°) dunes, however little is known about low-angle dunes. This study examines flow and suspension events over low-angle dunes in unsteady flow of the Fraser Estuary, Canada. Dune field bathymetry was mapped using a multibeam echo sounder while an acoustic Doppler current profiler simultaneously provided flow and suspended sediment measurements over a range of flows through tidal cycles. Mean flow and sediment transport varied through the tidal cycles. River flow dominated at low tide and large-scale suspended sediment events emerged as important sediment transport agents. I estimate that 69% of the total sediment is carried by 50% of the flow during low tide suspension events dominate the flow field.
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How this classification was reachedexpand
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) | 0.009 | 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 teacher head, 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".