Optimal Configuration of a Convection-Permitting Regional Climate Model in Simulating Precipitation Extremes: The Saguenay Flood
Bibliographic record
Abstract
Abstract This case study concerns a major flood event occurred in July 1996 in the Saguenay region (Québec, Canada) induced by heavy and persistent rainfall over this river basin. Various configurations of the CRCM6/Global Environmental Multiscale (GEM) model, version 5 (GEM5), regional climate model (RCM) using 12-km (0.11° × 0.11°) and convection-permitting (CP) 2.5-km (0.0225° × 0.0225°) resolutions are used to evaluate added value from CP simulations on the simulated extreme precipitation characteristics. The effects of spectral nudging (SN) and initial soil moisture conditions (ISMCs) on surface are also tested on the simulated rainfall. The evaluation of all simulations shows a significant improvement in reproducing precipitation extremes with the CP model (CPM) at 2.5 km and substantial influences from SN and ISMCs. The SN in the CP simulation improved the spatial and temporal patterns of precipitation extremes. Additionally, forced ISMC from long-term simulations at a 12-km resolution significantly enhanced the model’s ability to capture rainfall intensity, using rainfall observed stations as a reference dataset. This research contributes to the understanding of extreme precipitation events and their reliability as simulated by various configurations of our RCM, and the need to apply higher resolution and accurate surface conditions in the CRCM6/GEM5 for future projections, and their use in design infrastructures and flood risk management strategies.
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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 | 0.001 | 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".