Glaciated Coasts

Forbes, Donald L.

doi:10.1016/b978-0-12-374711-2.00311-9

Cited by 7 publications

(9 citation statements)

References 123 publications

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“…This connection suggests that the dominant control of sediment availability on the progradation of this system was related to the erosion and reworking of sediments derived from proximal moraines by waves in response to rising RSL or storm activity. Such responses to RSL rise are well documented along many paraglacial coasts (Church and Ryder, 1972;Orford et al, 1991;Ballantyne, 2002;Engels and Roberts, 2005;Forbes, 2011;Hein et al, 2014a). In this manner, RSL rise below a minimum threshold rate (here c. 0.2 mm/yr) leads to rapid depletion of sediment stores at a given shoreline position, thus slowing down-drift progradation (Forbes et al, 1995;Jennings et al, 1998).…”

Section: Accepted Manuscriptmentioning

confidence: 86%

“…Any fluctuations in the rate of sediment supply to form this system were likely related to changes in erosion rates of proximal moraines during storms and the delivery rates of these sediments to the barrier by constructive waves. These processes were both, in turn, affected by the rate of RSL change and climate-driven changes in wave energy (c.f., Ballantyne, 2002;Forbes, 2005;2011). The growth of this nearly 5 km 2 beach-ridge plain (Fig.…”

Section: Impact Of Rsl Changes On Beach-ridge Plain Progradationmentioning

confidence: 92%

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Insight into the late Holocene sea-level changes in the NW Atlantic from a paraglacial beach-ridge plain south of Newfoundland

et al. 2015

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Section: Accepted Manuscriptmentioning

confidence: 86%

Section: Impact Of Rsl Changes On Beach-ridge Plain Progradationmentioning

confidence: 92%

Insight into the late Holocene sea-level changes in the NW Atlantic from a paraglacial beach-ridge plain south of Newfoundland

et al. 2015

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“…Both sites are paraglacial in the sense that coastal sediments are derived from eroding glacial or proglacial deposits and the pre-transgressive glacial topography exerts a strong influence on the coastal response to rising sea level (Forbes 2012).…”

Section: Discussionmentioning

confidence: 99%

“…The paraglacial setting of the PEI coast exerts a profound influence on the geomorphology and transgressive stratigraphy (Forbes 2012). The presence of till or other compact and quasi-resistant icecontact sediments overlying bedrock at shallow depth plays a large part in determining the topography and inner-shelf bathymetry, the erosional processes, and sediment supply along this coast.…”

Section: Glacial Legacymentioning

confidence: 99%

Coastal products of marine transgression in cold-temperate and high-latitude coastal-plain settings: Gulf of St Lawrence and Beaufort Sea

Forbes

Manson

Whalen

et al. 2014

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Cold climate exerts a clear influence on the processes of marine transgression in midand high-latitude coastal-plain settings, but its signature in the depositional record is much clearer at high latitude. Both cases selected for this study are influenced by the legacy of past glaciation and the pervasive effects of ongoing Holocene marine transgression. Both are affected by sea ice. The high-latitude site lies within the zone of continuous permafrost and the abundance of excess ground ice along the Beaufort coast is the dominant factor distinguishing it from the mid-latitude Gulf of St Lawrence (GSL) setting and standard models of transgressive coasts elsewhere. In the southern GSL, the transgressive unconformity (TU) is at the seabed (or buried by a very thin veneer) across the inner shelf; shoreface sand moves landward, keeping pace with the transgressive front through deposition in barriers, dunes and estuaries. The pace of transgression in the Beaufort Sea is influenced by a number of distinctive periglacial erosion processes, including thermal abrasion and thaw subsidence. Marine transgression across this landscape creates intricate breached-lake estuaries and low sandy barrier beaches with limited dunes, leaving distinctive facies suites and geometry, while seaward sediment transport buries the TU on the inner shelf.

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“…; Shaw et al . ; Forbes ). Another response of gravel barriers to rising RSL has been observed in parts of southeastern Canada, where seaward‐rising sets of beach ridges are observed in areas characterized by RSL rise during the Holocene (e.g.…”

Section: Introductionmentioning

confidence: 99%

Evolution and morphodynamics of a prograded beach‐ridge foreland, northern baffin island, canadian arctic archipelago

St-Hilaire-Gravel

Forbes

Bell

2015

Geografiska Annaler: Series A, Physical Geography

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Landward retreat (marine transgression) is a common response of coastal systems to rising relative sea level. However, given sufficient sediment supply, the coast may advance seaward. The latter response of gravel barriers has been recorded in parts of southeastern and northwestern Canada, where seaward‐rising sets of beach ridges are observed in areas of Holocene RSL rise. Cape Charles Yorke, northern Baffin Island, is a 5 km long gravel foreland characterized by seaward‐rising beach‐ridge crest elevations. The prograded morphology of the Cape Charles Yorke foreland is a prime example of coastal response to a combination of rising RSL and abundant sediment supply, an unusual and little‐documented pattern in the Canadian Arctic. The main gravel supply to Cape Charles Yorke is likely from eroding bedrock and raised marine deposits southwest of the foreland. Although not the dominant sediment source, the Cape Charles Yorke delta contributed to the formation of the foreland by sheltering it from easterly storm waves and providing an anchor point for the prograding ridges. The truncation of relict ridges by the modern shoreline suggests a recent regime shift from continuous deposition to predominant erosion. The cause and timing of this shift are unknown but could result from a recent dwindling in sediment supply, increased accommodation space, increased wave energy, and/or an accelerated rise of relative sea level.

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Glaciated Coasts

Cited by 7 publications

References 123 publications

Insight into the late Holocene sea-level changes in the NW Atlantic from a paraglacial beach-ridge plain south of Newfoundland

Insight into the late Holocene sea-level changes in the NW Atlantic from a paraglacial beach-ridge plain south of Newfoundland

Coastal products of marine transgression in cold-temperate and high-latitude coastal-plain settings: Gulf of St Lawrence and Beaufort Sea

Evolution and morphodynamics of a prograded beach‐ridge foreland, northern baffin island, canadian arctic archipelago

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