Investigating erosional processes and rate of erosion of a sea cliff in Hantsport, Nova Scotia
Notice bibliographique
Résumé
Coastal erosion is a natural process that can become an issue when there is no space to accommodate the retreat of a coastline; this is the case in many coastal communities across Nova Scotia. Addressing issues such as erosional processes have become a priority as environmental disturbances are increasing in both magnitude and frequency which can threaten lives and infrastructure. Hantsport is a community in Nova Scotia, located along the coast of the Avon River estuary which empties into the Minas Basin. Recent studies on the Avon River have explored changes in bathymetry and sedimentation over time; however, specific coastal erosion studies in this area have not been done. Hantsport is unique as it is part of a macrotidal environment, with a tidal range of over 15 m, and has a long history of anthropogenic influence on the environment. For this study, sediment stratigraphy and hydrology, drone surveying, time lapse photography, ground penetrating radar, and community historical narratives were used to better understand how natural and anthropogenic processes influence coastal erosion.Sea cliffs parallel to Avon Street, Hantsport are composed of permeable post-glacial outwash sediment overlying impermeable glacial till, both of which are susceptible to oversteepening and vulnerable to wave, rain, and freeze-thaw induced failure. The contact between these strata dip towards the Avon River, a geometry that can result in the development of a glide plane that may lead to further sea cliff failure. Time lapse photography taken between June 2024 and January 2025, show that most failure is associated with high tide conditions that coincide with both storms (high wave energy) and rainfall.Winter temperatures and the establishment of a thin frozen surface layer can also produce a thin near-vertical cliff face that fails if the cliff base is eroded. Rainfall and thawing may further exacerbate this condition. Previously installed gabions and coastal hardening structures have slowed erosional processes; however, these structures have been significantly disturbed and in places removed by large storms and lack of maintenance. Where these structures are absent, erosion has accelerated. Areas of the coastline that lie perpendicular to wave fetch are especially vulnerable to continued and accelerated erosion.The coastline under study may require engineered structures to reduce the rate of erosion. A review of which approach is most compatible with the site is outside of the scope of this study though the rate of sea cliff retreat is significant enough to warrant immediate action.
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Prédiction distillée sur la base complète
Imitation des enseignantsNi prévalence calibrée, ni vérité terrain. Validation humaine à venir. Apprise à partir de 10 348 étiquettes directes de Codex et de 10 348 étiquettes directes de Gemma. Le mode candidate est l'union des têtes enseignantes seuillées; le consensus est leur intersection. Ces sorties portent le statut machine_predicted_unvalidated et ne sont ni des étiquettes humaines ni des étiquettes directes de modèles de pointe.
Scores Codex et Gemma par catégorie
| Catégorie | Codex | Gemma |
|---|---|---|
| Métarecherche | 0,000 | 0,001 |
| Méta-épidémiologie (sens strict) | 0,000 | 0,000 |
| Méta-épidémiologie (sens large) | 0,000 | 0,000 |
| Bibliométrie | 0,000 | 0,001 |
| Études des sciences et des technologies | 0,000 | 0,000 |
| Communication savante | 0,000 | 0,000 |
| Science ouverte | 0,001 | 0,000 |
| Intégrité de la recherche | 0,000 | 0,000 |
| Charge utile insuffisante (le modèle a refusé de juger) | 0,000 | 0,000 |
Scores machine (provisoires)
Les deux têtes enseignantes du modèle étudiant, lues sur ce travail. Un score ordonne la base pour la relecture; il n'affirme jamais une catégorie, et le statut de validation accompagne chaque rangée tel quel.
Scores de référence d'un modèle non mature (critères de maturité non atteints, 7 itérations). Un score ordonne; il n'affirme jamais une catégorie.
score_only:v0-immature-baseline · tel quel depuis la passe de notation : score_only signifie que le nombre peut ordonner les travaux, et qu'aucune étiquette de catégorie n'en découleClassification
machine, non validéePrédiction automatique; un appel candidat d’une seule tête enseignante, pas un consensus.
Le détail, modèle par modèle et score par score, se trouve en fin de page sous « Comment cette classification a été obtenue ».