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A list of all pages that have property "Theory movie" with value "In Arctic landscapes, recent warming has significantly altered geomorphic process rates. Along the Beaufort Sea coastline bounding Alaska’s North Slope, the mean annual coastal erosion rate has doubled from ~7 m/yr for 1955-1979 to ~14 m/yr for 2002-2007 (Mars and Houseknecht, 2007). Locally the erosion rate can reach 30 m/yr. We aim to understanding the processes that influence coastal erosion rates; since we want to predict the response of the coast and its adjacent landscape to a rapidly changing climate, with implications for sediment and carbon fluxes, oilfield infrastructure, and animal habitat. The evolution of the permafrost bluffs on the North Slope is controlled by three conditions: length of the sea ice free season, warming sea water and wave and storm surge. During the sea ice-free season, relatively warm waters melt a notch into the ice-rich silt that comprises the 4-m tall bluffs. The bluffs ultimately fail by toppling of polygonal blocks bounded by mechanically weak ice-wedges that are spaced roughly 10-20 m apart. The toppled blocks then temporarily armor the coast against further attack. The annual coastal retreat rate is controlled by the length of the sea ice-free season, water and air temperatures, and the wave history. Honoring the high ice content of the bluff materials, it is thought that subaerial melt plays a minor role, and that the notching of the base of the bluff acts as an melting dirty ice berg. In quantitative iceberg melting models the local instantaneous melt rate goes as the product of the temperature difference between seawater and bluff material, and the wave height. Calculated instantaneous melt rate can be adjusted to account for the ambient temperature of the permafrost and the presence of non-ice material in the bluffs. Once a block is sufficiently undercut to become unstable it will fail and topple. The latter process can be described as a torque balance.". Since there have been only a few results, also nearby values are displayed.

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Movie:Arctic Coastal Erosion Discussion + (In Arctic landscapes, recent warming has s … In Arctic landscapes, recent warming has significantly altered geomorphic process rates. Along the Beaufort Sea coastline bounding Alaska’s North Slope, the mean annual coastal erosion rate has doubled from ~7 m/yr for 1955-1979 to ~14 m/yr for 2002-2007 (Mars and Houseknecht, 2007). Locally the erosion rate can reach 30 m/yr. We aim to understanding the processes that influence coastal erosion rates; since we want to predict the response of the coast and its adjacent landscape to a rapidly changing climate, with implications for sediment and carbon fluxes, oilfield infrastructure, and animal habitat.</br></br>The evolution of the permafrost bluffs on the North Slope is controlled by three conditions: length of the sea ice free season, warming sea water and wave and storm surge. During the sea ice-free season, relatively warm waters melt a notch into the ice-rich silt that comprises the 4-m tall bluffs. The bluffs ultimately fail by toppling of polygonal blocks bounded by mechanically weak ice-wedges that are spaced roughly 10-20 m apart. The toppled blocks then temporarily armor the coast against further attack. </br></br>The annual coastal retreat rate is controlled by the length of the sea ice-free season, water and air temperatures, and the wave history. Honoring the high ice content of the bluff materials, it is thought that subaerial melt plays a minor role, and that the notching of the base of the bluff acts as an melting dirty ice berg. In quantitative iceberg melting models the local instantaneous melt rate goes as the product of the temperature difference between seawater and bluff material, and the wave height. Calculated instantaneous melt rate can be adjusted to account for the ambient temperature of the permafrost and the presence of non-ice material in the bluffs. Once a block is sufficiently undercut to become unstable it will fail and topple. The latter process can be described as a torque balance.cess can be described as a torque balance.)

Movie:Arctic Coastal Erosion Discussion +