Tidal influence on flow structure and dune morphology, Fraser River Estuary, British Columbia, Canada
Bibliographic record
Abstract
This study examines the influence of tidal motion on velocity flow structure and dune morphology in the Fraser River Estuary near Vancouver, British Columbia. An acoustic Doppler Profiler (ADP) and high resolution survey echosounder were used to simultaneously record flow velocity and dune form over the course of one tidal cycle along a 250 m reach of the Main Channel of the Fraser River on June 20, 2000. Eight large symmetric dunes were analyzed During the tidal cycle mean velocity follows changes in tidal stage although deceleration on the flood tide is more rapid than during the ebb tide. Due to continuous flow disequilibrium in the estuary, a 'memory' of previous flow conditions is retained next to the bed. This 'memory' results in kinked velocity profiles that must be regarded with caution when calculating shear stress estimates. Dune height increased on the failing tide and decreased on the rising tide, indicating that the response time required for the adjustment of dune height to mean velocity is considerably less than one tidal cycle.
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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 | 0.001 | 0.001 |
| Science and technology studies | 0.002 | 0.000 |
| Scholarly communication | 0.001 | 0.000 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.002 | 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".