Coastal retreat and shoreface profile variations in the Canadian Beaufort Sea

Héquette, Arnaud; Barnes, Peter W.

doi:10.1016/0025-3227(90)90136-8

Cited by 68 publications

(70 citation statements)

References 16 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The height of the backshore shows a statistically insignificant correlation with low R² (0.006). The highest backshore elevations (>40 m) nevertheless, as expected, are retreating a little more slowly than cliffs with elevations of less than 10 m, probably because a larger quantity of debris must be removed before additional retreat can occur, but as a whole, and consistent with the findings of Héquette and Barnes (1990), erosion is poorly linked to backshore elevations.…”

Section: Coastal Erosionsupporting

confidence: 73%

“…7a). This relatively low coefficient of determination is slightly lower than the one presented by Héquette and Barnes (1990) in the Canadian Beaufort Sea for the same statistical relationship, but close enough to provide a backdrop to the present study. In our dataset, a significant number of ice-rich segments, mostly in the Canadian Archipelago, are not affected by erosion because of sea ice presence, and alter the statistical relation.…”

Section: Coastal Erosionsupporting

confidence: 71%

“…The presence of terrestrial ground ice allows abrasion to proceed faster; a process termed "thermal abrasion" (Aré 1988) which encompasses the combined kinetic action of waves and thawing of the permafrost. Upon melting, it enhances coastal zone susceptibility to erosion, (Héquette and Barnes 1990;Kobayashi et al 1999), especially when present as massive ice in coastal cliffs, or through the occurrence of large thermokarst features in the coastal zone The coast, whether in temperate or polar regions, is a complex and diverse environment, at a number of spatial scales. This complexity is difficult to capture with a systematic or rigid compartmentalizing approach.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

The Arctic Coastal Dynamics Database: A New Classification Scheme and Statistics on Arctic Permafrost Coastlines

Lantuit

Overduin

Couture

et al. 2011

Estuaries and Coasts

354

368

View full text Add to dashboard Cite

Arctic permafrost coasts are sensitive to changing climate. The lengthening open water season and the increasing open water area are likely to induce greater erosion and threaten community and industry infrastructure as well as dramatically change nutrient pathways in the near-shore zone. The shallow, mediterranean Arctic Ocean is likely to be strongly affected by changes in currently poorly observed arctic coastal dynamics. We present a geomorphological classification scheme for the arctic coast, with 101,447 km of coastline in 1,315 segments. The average rate of erosion for the arctic coast is 0.5 m year −1 with high local and regional variability. Highest rates are observed in the Laptev, East Siberian, and Beaufort Seas. Strong spatial variability in associated database bluff height, ground carbon and ice content, and coastline movement highlights the need to estimate the relative importance of shifting coastal fluxes to the Arctic Ocean at multiple spatial scales.

show abstract

Section: Coastal Erosionsupporting

confidence: 73%

Section: Coastal Erosionsupporting

confidence: 71%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

The Arctic Coastal Dynamics Database: A New Classification Scheme and Statistics on Arctic Permafrost Coastlines

Lantuit

Overduin

Couture

et al. 2011

Estuaries and Coasts

354

368

View full text Add to dashboard Cite

show abstract

“…The total wave energy can be calculated as the sum of energies in every particular direction multiplied by correction coefficients for the orthogonal direction (Hequette and Barnes 1990). We have calculated conventional values of the annual energy of sea waves for each particular direction as the product of the squared height of waves and the duration of waves coming to shore in a given direction.…”

Section: Marre-salementioning

confidence: 99%

Coastal dynamics at the Barents and Kara Sea key sites

et al. 2004

View full text Add to dashboard Cite

The results of permafrost and coastal dynamics investigations at four key sites on the shores of the Kara and Barents Seas are discussed. Three ACD key sites, Marre-Sale, Shpindler, and Kolguev, characterize areas with active thermal erosion; key site Cape Bolvansky is found on a relatively stable coast. It is found that the coastal retreat rate has spatial and temporal variability, which is typical of the entire Arctic coast. Coastal deposits on the Kara and Barents Seas have a low organic carbon content. Annual input of material into the Kara Sea resulting from coastal degradation reaches 35-40 million t, including about 7.5 million t of ice, 0.35 million t of organic carbon, and 0.3 million t of soluble salts.

show abstract

“…Regional factors acting on a larger scale are storminess, waves and storm surges, ice-free season duration, sea level, and summertime sea surface temperature. Local factors controlling erosion are sediment properties (cohesiveness and grain size), cryostratigraphy (amount, type, and distribution of ground ice), and geomorphology (cliff height and slope, exposure, underwater shore slope, presence of barrier islands and spits, littoral sediment supply, and coastal hinterland topography) (Héquette and Barnes, 1990;Solomon, 2005;Jones et al, 2009). Dallimore et al (1996) emphasised the importance of storm events in connection with ground ice contents in the onshore sediments for coastal erosion in the Canadian Beaufort Sea.…”

Section: Introductionmentioning

confidence: 99%

Coastal erosion and mass wasting along the Canadian Beaufort Sea based on annual airborne LiDAR elevation data

et al. 2017

View full text Add to dashboard Cite

Erosion of permafrost coasts has received increasing scientific attention since 1990s because of rapid land loss and the mobilisation potential of old organic carbon. The majority of permafrost coastal erosion studies are limited to time periods from a few years to decades. Most of these studies emphasize the spatial variability of coastal erosion, but the intensity of inter-annual variations, including intermediate coastal aggradation, remains poorly documented. We used repeat airborne Light Detection And Ranging (LiDAR) elevation data from 2012 and 2013 with 1 m horizontal resolution to study coastal erosion and accompanying mass-wasting processes in the hinterland. Study sites were selected to include different morphologies along the coast of the Yukon Coastal Plain and on Herschel Island. We studied elevation and volume changes and coastline movement and compared the results between geomorphic units. Results showed simple uniform coastal erosion from low coasts (up to 10 m height) and a highly diverse erosion pattern along coasts with higher backshore elevation. This variability was particularly pronounced in the case of active retrogressive thaw slumps, which can decrease coastal erosion or even cause temporary progradation by sediment release. Most of the extremes were recorded in study sites with active slumping (e.g. 22 m of coastline retreat and 42 m of coastline progradation). Coastline progradation also resulted from the accumulation of slope collapse material. These occasional events can significantly affect the coastline position on a specific date and can affect coastal retreat rates as estimated in long term by coastline digitalisation from air photos and satellite imagery. These deficiencies can be overcome by short-term airborne LiDAR measurements, which provide detailed and high-resolution information about quickly changing elevations in coastal areas.

show abstract

Coastal retreat and shoreface profile variations in the Canadian Beaufort Sea

Cited by 68 publications

References 16 publications

The Arctic Coastal Dynamics Database: A New Classification Scheme and Statistics on Arctic Permafrost Coastlines

The Arctic Coastal Dynamics Database: A New Classification Scheme and Statistics on Arctic Permafrost Coastlines

Coastal dynamics at the Barents and Kara Sea key sites

Coastal erosion and mass wasting along the Canadian Beaufort Sea based on annual airborne LiDAR elevation data

Contact Info

Product

Resources

About