Repetitive Seabed Mapping to Constrain Iceberg Scour Frequency Estimates, Offshore Labrador
Bibliographic record
Abstract
Subsea facilities and pipelines offshore Labrador will require protection from damage from keel-dragging icebergs, however, protection requirements remain uncertain, in large part because the impact frequency is poorly constrained. New Labrador shelf iceberg scour frequency estimates are presented based on repetitive seabed mapping surveys over 18 to 27 years. Two sidescan sonar mosaics were compared over 25 years on eastern Saglek Bank between 156 and 192 metres water depth (mwd). Four new furrows were recognized, resulting in an average scour frequency of 3.8×10⁻³ km⁻² yr⁻¹. On western Saglek Bank between 140 and 175 mwd, 2 new furrows were identified comparing 1981 sidescan sonar to 2006 multibeam sonar data. The calculated scour rate for western Saglek Bank is 2.2×10⁻³ km⁻² yr⁻¹. New ice scour events occurred most frequently at Caroline, the most northern site and also the shallowest in 115 to 121 metres water depth: 12 new furrows and 3 pits occurred between 1979 and 2006: the combined impact rate for both furrows and pits is 4.4×10⁻² km⁻² yr⁻¹. The Saglek Bank repetitive mapping sites provide a valuable upper constraint on scour frequency estimates for Makkovik Bank, the site of proposed natural gas development, approximately 500 km to the south.
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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) | 0.000 | 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".