| Title | Morphosedimentary development of drumlin-flank barriers with rapidly rising sea level, Story Head, Nova Scotia |
| |
| Author | Carter, R W G; Orford, J D; Forbes, D L ; Taylor, R B |
| Source | Sedimentary Geology vol. 69, 1990 p. 117-138, https://doi.org/10.1016/0037-0738(90)90104-2 |
| Year | 1990 |
| Alt Series | Geological Survey of Canada, Contribution Series 26290 |
| Publisher | Elsevier BV |
| Document | serial |
| Lang. | English |
| Media | paper; on-line; digital |
| File format | pdf |
| Province | Nova Scotia |
| NTS | 11D/10; 11D/11; 11D/12; 11D/14; 11D/15; 11D/16; 11F/09; 11F/10; 11F/16; 11G/13 |
| Area | Story Head |
| Lat/Long WENS | -64.0000 -61.0000 45.2500 44.7500 |
| Lat/Long WENS | -61.0000 -60.0000 46.0000 45.5000 |
| Subjects | surficial geology/geomorphology; marine geology; drumlins; longshore bars; sea level changes; sea level fluctuations; shore features; shoreline changes; shorelines; gravel bars; sediments; coastal
erosion; coastal studies; Quaternary |
| Illustrations | sketch maps; photographs; tables |
| Released | 1990 11 01 |
| Abstract | The morphodynamic and morphosedimentary development of drift-aligned and swash-aligned coarse clastic barriers plays an important role in the evolution of paraglacial coasts. This paper discusses the
development of two contrasting barriers attached to a drumlin headland at Story Head on the Atlantic coast of Nova Scotia, southeastern Canada. A 3-4 mm a?1 sea-level rise is forcing rapid barrier changes, including landward migration (rollover) of
the swash-aligned barrier at 5-8 m a?1, and barrier thinning, elongation and breaching. Morphological development reflects the highly variable longshore distribution of wave power, imposed initially by the topography of the drumlin and its position
in the incident wave field, and later by morphosedimentary feedback resulting from such gradients. Gradual reduction of an inherently intermittent sediment supply leads to reworking (cannibalization) of the barrier, ultimately finding expression in a
series of distinct wave-formed sediment cells. Further diminution of the sediment supply, coupled to cell development, results in the drift-aligned system decaying into a series of high-water residuals, separated by breach depressions, with splayed
spit recurves at the margins. Although the swash-aligned barrier is stretched within the predominant overwash regime and may eventually separate from the headland, it has remained intact until very recently, when an initial breach occurred. The
evolutionary sequence of the headland-barrier system has an important effect on adjacent sedimentary environments. |
| GEOSCAN ID | 203808 |
|
|