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Record W2296953449 · doi:10.15273/pnsis.v42i1.3596

Coastal character and coastal barrier evolution in the Bras d'Or Lakes, Nova Scotia

2002· article· en· W2296953449 on OpenAlexaffvenueabout
R B Taylor

Bibliographic record

VenueProceedings of the Nova Scotian Institute of Science · 2002
Typearticle
Languageen
FieldEarth and Planetary Sciences
TopicCoastal and Marine Dynamics
Canadian institutionsGeological Survey of Canada
Fundersnot available
KeywordsShoreNova scotiaOceanographyGeologyFlood mythFlooding (psychology)Natural (archaeology)GeographyArchaeologyPaleontology

Abstract

fetched live from OpenAlex

Little coastal geological research has been conducted in the Bras d’Or Lakes. This is the first reexamination of the coastline since the early 1900s. The 1234 km of coastline is extremely varied in relief and morphology. In terms of composition, 13.5% of the shores are rock, 1.6% are artificial or human-made, and the remainder is composed of unconsolidated sediment. It is estimated that 27% of the shores are along narrow channels and embayments which are sheltered from higher wave energy, but many are low lying which makes them more vulnerable to increased flooding as sea level rises. Many of the larger coastal barriers noted in the late 19 th century remain. Using the oldest and most recent air photos and aerial video, changes at selected coastal barriers are assessed and a conceptual model for coastal barrier evolution is presented. Five natural phases of evolution were identified: (1) initiation, (2) growth, (3) establishment, (4) breakdown and (5) stranding or collapse. An alternativeoutcome for many barriers is artificial constraint (6), which is becoming more common as human activity increases in the Lakes. The criteria used in the model were applied to 80 of the largest coastal barriers to check its application as a guide for assessing shoreline stability. Thirty-nine percent of the barriers were identified in a building and established phase, and 44% in a breakdown to collapse phase. Field surveys are required to confirm the model and sample material for determining the age of coastal barriers and the duration of different phases of their evolution.Très peu d’études géologiques sur les lacs Bras d’Or ont été effectuées jusqu’à présent. Cette étude constitue le premier ré-examen du littoral depuis le début du 19e siècle. Les 1234 km de littoral présentent une variété très riche sur le plan du relief et de la morphologie. En effet, 13,5 % des rivages sont constitués de roche, 1,6 % sont d’origine artificielle ou dus à l’intervention humaine, et tous les autres sont composés de sédiments non consolidés. On estime que 27 % des rivages se trouvent en bordure de canaux étroits et d’échancrures, ce qui les protège contre la forte énergie des vagues. Par contre, bon nombre d’entre eux sont de basse altitude, ce qui les rend plus vulnérables aux inondations lorsque le niveau de la mer s’élève. Plusieurs des grandes barrières littorales relevéesà la fin du 19e siècle sont toujours présentes. Grâce à des photos aériennes d’hier et d’aujourd’hui et de vidéos aériennes, divers changements survenus à des barrières littorales sélectionnées ont pu être évalués et un modèle conceptuel d’évolution des barrières littorales a été proposé. Cinq phasesnaturelles d’évolution ont été identifiées : (1) initiation, (2) croissance, (3) établissement, (4) dégradation, et (5) effondrement. Une autre issue possible est la contrainte artificielle (6), qui devient de plus en plus fréquente avec une augmentation de l’activité humaine dans les lacs. Les critères utilisés dans lemodèle ont été appliqués à 80 des plus imposantes barrières littorales pour vérifier leur efficacité en tant que guide d’évaluation de la stabilité du littoral. On a déterminé que trente-neuf pour cent des barrières se trouvaient dans une phase de construction et d’établissement, et 44% dans une phase de dégradation ou d’effondrement. Des études sur le terrain sont nécessaires pour confirmer le modèle et prélever des échantillons afin de déterminer l’âge des barrières littorales et la durée des différentes phases de leur évolution.

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 distilled prediction

Teacher imitation

Not 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.

metaresearch head score (Codex)0.001
metaresearch head score (Gemma)0.000
Version: codex-gemma-dda1882f352aValidation status: machine_predicted_unvalidated
Candidate categoriesScience and technology studies
Consensus categoriesnone
DomainCandidate signal: none · Consensus signal: none
Study designCandidate signal: Observational · Consensus signal: Observational
GenreCandidate signal: Empirical · Consensus signal: Empirical
Teacher disagreement score0.046
Threshold uncertainty score1.000

Codex and Gemma teacher scores by category

CategoryCodexGemma
Metaresearch0.0010.000
Meta-epidemiology (narrow)0.0000.000
Meta-epidemiology (broad)0.0000.000
Bibliometrics0.0000.001
Science and technology studies0.0000.003
Scholarly communication0.0000.001
Open science0.0010.000
Research integrity0.0000.000
Insufficient payload (model declined to judge)0.0000.000

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 head0.020
GPT teacher head0.213
Teacher spread0.193 · 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 teacher head, not a consensus.

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".

Quick stats

Citations5
Published2002
Admission routes3
Has abstractyes

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