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Spatio-temporal evolution of a thermokarst in Interior Alaska
AbstractLandscape modifications in Arctic and subarctic regions due to warming climate conditions have been reported in recent years. This work describes the rapid development of a thermokarst in Interior Alaska over a two-year period. The research was conducted in the Caribou-Poker Creeks Research Watershed, the only research watershed in the United States underlain by discontinuous permafrost. The basin's coordinates are 65°10' N latitude and 147°30' W longitude. Within the short span of two warm summers, a portion of the study area progressed from a hummocky terrain to a well-defined channel configuration. Suspended sediment concentration and discharge measurements indicated high sediment loads following rainfall events, which play a major role in the study area's sediment transport process. Fluvio-thermal erosion detected in late spring of 2004 triggered block failures on the thermokarst's sides. The spatio-temporal evolution of a cryogenic pipe was documented during the second summer. Water flow inside the pipe caused high erosion in the soil matrix. Eroded soil sediment was transported and deposited downstream, creating a fairly smooth bed slope. Topographical surveys conducted during the two field seasons revealed an average erosion rate of 3.5 m/year.
Spatio-temporal evolution of a thermokarst in Interior Alaska
AbstractLandscape modifications in Arctic and subarctic regions due to warming climate conditions have been reported in recent years. This work describes the rapid development of a thermokarst in Interior Alaska over a two-year period. The research was conducted in the Caribou-Poker Creeks Research Watershed, the only research watershed in the United States underlain by discontinuous permafrost. The basin's coordinates are 65°10' N latitude and 147°30' W longitude. Within the short span of two warm summers, a portion of the study area progressed from a hummocky terrain to a well-defined channel configuration. Suspended sediment concentration and discharge measurements indicated high sediment loads following rainfall events, which play a major role in the study area's sediment transport process. Fluvio-thermal erosion detected in late spring of 2004 triggered block failures on the thermokarst's sides. The spatio-temporal evolution of a cryogenic pipe was documented during the second summer. Water flow inside the pipe caused high erosion in the soil matrix. Eroded soil sediment was transported and deposited downstream, creating a fairly smooth bed slope. Topographical surveys conducted during the two field seasons revealed an average erosion rate of 3.5 m/year.
Spatio-temporal evolution of a thermokarst in Interior Alaska
Toniolo, H. (Autor:in) / Kodial, P. (Autor:in) / Hinzman, L.D. (Autor:in) / Yoshikawa, K. (Autor:in)
Cold Regions, Science and Technology ; 56 ; 39-49
24.09.2008
11 pages
Aufsatz (Zeitschrift)
Elektronische Ressource
Englisch
Thermokarst , Erosion , Sedimentation , Piping , Permafrost
Spatio-temporal evolution of a thermokarst in Interior Alaska
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Triangulation in interior Alaska
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SOUTHCENTRAL AND INTERIOR ALASKA
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