Long Term Modifications Of Perennially Frozen Sediment And Terrain At East Oumalik Northern Alaska PDF Download
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Author | : Daniel E. Lawson |
Publisher | : |
Total Pages | : 54 |
Release | : 1982 |
Genre | : Erosion |
ISBN | : |
Download Long-term Modifications of Perennially Frozen Sediment and Terrain at East Oumalik, Northern Alaska Book in PDF, ePub and Kindle
Author | : Daniel E. Lawson |
Publisher | : |
Total Pages | : 33 |
Release | : 1982 |
Genre | : Erosion |
ISBN | : |
Download Long-term Modifications of Perennially Frozen Sediment and Terrain at East Oumalik, Northern Alaska Book in PDF, ePub and Kindle
Camp construction and drilling activities in 1950 at the East Oumalik drill site in northern Alaska caused extensive degradation of ice-rich, perennially frozen silt and irreversible modification of the upland terrain. In a study of the long-term degradational effects at this site, the near-surface geology was defined by drilling and coring 76 holes (maximum depth of 34 m) in disturbed and undisturbed areas and by laboratory analyses of these cores. Terrain disturbances, including bulldozed roads and excavations, camp structures and off-road vehicle trails, were found to have severely disrupted the site's thermal regime. This led to a thickening of the active layer, melting of the ground ice, thaw subsidence and thaw consolidation of the sediments. Slumps, sediment gravity flows and collapse of materials on slopes bounding thaw depressions expanded the degradation laterally, with thermal and hydraulic erosion removing materials as the depressions widened and deepened with time. Degradational processes became less active after thawed sediments thickened sufficiently to slow the increase in the depth of thaw and permit slope stabilization. The site's terrain is now irregular and hummocky with numerous depressions. Seasonal thaw depths are deeper in disturbed areas than in undisturbed areas and reflect the new moisture conditions and morphology. The severity of disturbance is much greater at East Oumalik than at another old drill site, Fish Creek. The difference results primarily from differences in the physical properties of the sediments, including the quantity and distribution of ground ice.
Author | : Daniel E. Lawson |
Publisher | : |
Total Pages | : 33 |
Release | : 1982 |
Genre | : |
ISBN | : |
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Author | : |
Publisher | : |
Total Pages | : |
Release | : 1983-08 |
Genre | : Government publications |
ISBN | : |
Download Monthly Catalog of United States Government Publications Book in PDF, ePub and Kindle
Author | : |
Publisher | : |
Total Pages | : 1050 |
Release | : 1983 |
Genre | : Government publications |
ISBN | : |
Download Monthly Catalogue, United States Public Documents Book in PDF, ePub and Kindle
Author | : Cold Regions Research and Engineering Laboratory (U.S.) |
Publisher | : |
Total Pages | : 218 |
Release | : 1983 |
Genre | : Cold regions |
ISBN | : |
Download USA CRREL Benchnotes Book in PDF, ePub and Kindle
Author | : |
Publisher | : |
Total Pages | : 488 |
Release | : 1986 |
Genre | : Mountain plants |
ISBN | : |
Download Arctic and Alpine Research Book in PDF, ePub and Kindle
Author | : Daniel E. Lawson |
Publisher | : |
Total Pages | : 36 |
Release | : 1983 |
Genre | : Erosion |
ISBN | : |
Download Erosion of Perennially Frozen Streambanks Book in PDF, ePub and Kindle
Author | : |
Publisher | : |
Total Pages | : 44 |
Release | : 1985 |
Genre | : Augers |
ISBN | : |
Download Prototype Drill for Core Sampling Fine-grained Perennially Frozen Ground Book in PDF, ePub and Kindle
Author | : |
Publisher | : |
Total Pages | : 388 |
Release | : 1985 |
Genre | : Frozen ground |
ISBN | : |
Download Special Report Book in PDF, ePub and Kindle