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Information Page: ArcticErosion

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Bluff Erosion in the Arctic 2008

Key Attributes

Domain: coastal
Keywords: Coastal Bluff Erosion
Model name: Animation model name
Name: Irina, Overeem
Where: Beaufort Coast, Alaska
When: July 2-28, 2008

Short Description

Grade level: Middle (6-8), High (9-12), Under graduate (13-16), Graduate / Professional

Statement: Time-lapse series of coastal bluff erosion along the Arctic Coast at Drew Point, Beaufort Sea, Alaska

Abstract: Time-lapse series of coastal bluff erosion along the Arctic Coast at Drew Point, Beaufort Sea, Alaska. Coastal erosion rates exceeding 20 meters per year are being observed along the Arctic Coast, and they are especially high along Alaska’s Beaufort Sea coastline. Comparison of aerial photos and LANDSAT imagery suggest accelerating erosion rates over the last 50 years. Arctic sea ice coverage has been declining dramatically over the last few decades and record September minima were observed in 2007. These observations suggest a causal relationship between sea ice decline and coastal change. The timelapse movies presented here show that the relative roles of thermal and wave energy may be significant. The bluffs consist of silt and have high ice-content. The thawing of the ice-rich bluffs by relatively warm seawater undermines coastal bluffs, leading to topple failures of discrete blocks defined by ice-wedge polygons. The fine-grained nature of these materials does not function as a protective barrier for incoming waves, so there is not a strong negative feedback on erosion rates, so that coastal erosion rates in this setting are likely to increase with continued Arctic warming.


Drewpoint8 9.JPG
coast at 9th of August, 2007

Drewpoint8 14.JPG
coast at 14th of August, 2007



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