Bibliographic record
Abstract
The Chilliwack River flows through the Cascade Mountains until reaching a narrow gorge near Vedder Crossing where it flows onto the Fraser Lowlands and eventually meets the Fraser River. Below Vedder Crossing, the river is actively building an alluvial fan by depositing its sediment load of gravel and sand. This deposition has resulted in frequent channel shifts over the fan surface with the most recent migration occurring around 1894 when the river shifted down Vedder Creek. Over the last century the Vedder River has been undergoing very complex changes in response to changes in the incidence of severe floods, changes in sediment supply and interference from river training. Extensive channelization works carried out in the 1960's induced temporary degradation over part of the channel which was accompanied by rapid aggradation in the reach immediately downstream. This rapid channel adjustment ceased in less than 10 years. In 1975 a flood having a return period of about 10 years deposited 260,000 cubic yards of sediment onto the fan which increased the mean bedlevel by nearly 1 foot. By comparison, the average annual deposition rate was estimated to be 72,000 cubic yards per year. Based on bedload transport calculations, approximately 700,000 cubic yards of sediment could be deposited by a 50 year rainstorm flood. In order to provide long term flood control, either the upstream sediment supply will have to be reduced or dredging will have to be carried out on the lower river. It is not feasible to eliminate aggradation by transporting the incoming bedload through the system and into the Fraser River. Some strategies are considered which, by controlled dredging and training would maintain the channel permanently in its present position. More severe floods would be contained by set-back dikes. It is thought that, with care, these measures could be consistent with salmon habitat requirements.
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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 | 0.000 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.001 | 0.001 |
| Science and technology studies | 0.001 | 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 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".