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Record W6992508742

L'influence des paramètres météo-marins sur la dynamique du pied de glace sur une côte sableuse, Longue-Pointe-de-Mingan, Québec

2022· other· fr· W6992508742 on OpenAlexaboutno aff

Bibliographic record

VenueSémaphore (Université du Québec à Rimouski) · 2022
Typeother
Languagefr
Field
Topic
Canadian institutionsnot available
Fundersnot available
KeywordsGloomLimitingStaringExclosure
DOInot available

Abstract

fetched live from OpenAlex

RÉSUMÉ : Dans le but de mieux comprendre les effets des conditions météo-marines qui influencent la dégradation du pied de glace, un suivi temporel à haute résolution d'une côte sableuse a été effectué. Le suivi s'est fait sur le littoral de Longue-Pointe-de-Mingan, sur la côte nord du golfe du Saint-Laurent durant l'hiver 2017-2018. Grâce aux nombreux relevés terrain et aux multiples instruments développés dans le cadre de ce projet, les changements morphologiques et thermiques du pied de glace ont pu être quantifiés, puis mis en relation avec les conditions météo-marines environnantes, pour en arriver à identifier les processus et les différents modes de dégradation du pied de glace. Les observations quotidiennes du pied de glace ont permis de déterminer que pour la saison glacielle 2017-2018, le début du démantèlement du pied de glace est surtout marqué par l'effet mécanique des variables météo-marines, principalement par les vagues. Toutefois, les agents hydrodynamiques (marée et vagues) ont aussi un effet sur les échanges thermiques dans le pied de glace. Les sondes thermiques ont permis de démontrer que la marée avait une influence sous le pied de glace, à la limite de la surface de la plage. Les variations des signaux thermiques enregistrés concordent avec les variations marégraphiques. Ces résultats confirment que le pied de glace est une entité dynamique qui évolue sur les côtes tout au long de l'hiver. L'acquisition de nouvelles données a permis de soulever de nouvelles hypothèses, notamment l'influence des variations de la nappe phréatique à l'arrivée de la marée haute sur la plage, créant une saturation en eau plus importante de la plage. Combinés à la hausse des températures, ces deux effets seraient des conditions préalables au désancrage du pied de glace, un processus nécessaire au démantèlement massif tel qu'il a été observé au début de la période de déglacement lors de la saison 2017-2018. Les futures études quantitatives et le développement de nouvelles méthodes d'acquisition de données permettront d'obtenir de nouveaux regards sur la dynamique du pied de glace. -- Mot(s) clé(s) en français : glaciel, pied de glace, démantèlement, morphodynamique, variations thermiques, côte sableuse. -- \nABSTRACT : In order to understand the effects of hydrometeorological conditions that influence icefoot breakup, a high-resolution temporal monitoring of a sandy coast located in Longue-Pointe-de-Mingan, North Shore of Gulf of St. Lawrence, was conducted during the winter of 2017-2018. Through extensive field observations and instrumentation developed for this project, morphological and thermal changes in the ice foot were quantified and linked to seasonal hydrometeorological conditions in order to identify processes and icefoot dismantling patterns. Results indicate that for the winter of 2017-2018, the beginning of the breakup period is primarily mechanically driven by the effect of waves. However, tide and waves also play a role on thermal exchange in the icefoot. Thermal rods have demonstrated that tide has a thermal influence beneath the icefoot at the edge of the beach surface. The variations in the thermal signals recorded are consistent with tidal variations. The zone of influence, in this case, is limited by the maximum level reached by the tide and waves. These results confirm that the icefoot is a dynamic entity that evolves on the coast throughout the winter. The acquisition of new data allowed us to raise new hypotheses, particularly concerning the influence of variations in the water table at the arrival of high tide on the beach, which increases water saturation of the beach. This effect combined with rising temperatures would create conditions contributing to the de-anchoring of the icefoot, a process necessary for massive dismantling, as observed at the beginning of the breakup period for the 2017-2018 season. Future quantitative studies and the development of new data acquisition methods will allow pursuit of new insights into the dynamics of the icefoot. -- Mot(s) clé(s) en anglais : seasonal ice, icefoot, dismantling, morphodynamics, thermal variations, sandy coasts.

Fetched live from OpenAlex and de-inverted. Abstracts are not stored in this database: the inverted indexes are 8.6 GB of the frame’s 9.3 GB of text, and the host has 13 GB free.

How this classification was reachedexpand

Full frame machine prediction

Teacher imitation

Not 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.

metaresearch head score (Codex)0.000
metaresearch head score (Gemma)0.001
Version: metacan-v3-hybrid-931329e0061cValidation status: machine_predicted_unvalidated
Candidate categoriesnone
Consensus categoriesnone
DomainCandidate signal: none · Consensus signal: none
Study designCandidate signal: Observational · Consensus signal: Observational
GenreCandidate signal: Empirical · Consensus signal: Empirical
Teacher disagreement score0.094
Threshold uncertainty score0.190

Distilled classifier scores by category (both heads)

CategoryCodexGemma
Metaresearch0.0000.001
Meta-epidemiology (narrow)0.0000.000
Meta-epidemiology (broad)0.0000.000
Bibliometrics0.0010.001
Science and technology studies0.0010.001
Scholarly communication0.0010.000
Open science0.0000.000
Research integrity0.0000.000
Insufficient payload (model declined to judge)0.0020.000

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.

Opus teacher head0.006
GPT teacher head0.187
Teacher spread0.181 · how far apart the two teachers sit on this one work
Validation statusscore_only:v0-immature-baseline · verbatim from the scoring run: score_only means the number may rank works, and no category label ships from it

Classification

machine, unvalidated

Machine predicted; a candidate call from one source (direct Gemma or distilled Codex), not a consensus.

The models applied no category: nothing in the taxonomy fit this work.
Study designObservational
Domainnot available
GenreEmpirical

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".

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Citations0
Published2022
Admission routes1
Has abstractyes

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