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Titolo:
An analysis of an arctic channel network using a digital elevation model
Autore:
McNamara, JP; Kane, DL; Hinzman, LD;
Indirizzi:
Boise State Univ, Dept Geosci, Boise, ID 83725 USA Boise State Univ BoiseID USA 83725 niv, Dept Geosci, Boise, ID 83725 USA Univ Alaska Fairbanks, Water & Environm Res Ctr, Fairbanks, AK 99775 USA Univ Alaska Fairbanks Fairbanks AK USA 99775 Ctr, Fairbanks, AK 99775 USA
Titolo Testata:
GEOMORPHOLOGY
fascicolo: 3-4, volume: 29, anno: 1999,
pagine: 339 - 353
SICI:
0169-555X(199909)29:3-4<339:AAOAAC>2.0.ZU;2-N
Fonte:
ISI
Lingua:
ENG
Soggetto:
SELF-ORGANIZED CRITICALITY; RIVER NETWORKS; DRAINAGE NETWORKS; FRACTAL DIMENSION; COMBINED ALGORITHM; STREAM NETWORKS; CATCHMENT-AREA; EXTRACTION; BASIN; DISCHARGE;
Keywords:
drainage network; permafrost; arctic; fractal; Alaska;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
64
Recensione:
Indirizzi per estratti:
Indirizzo: McNamara, JP Boise State Univ, Dept Geosci, Boise, ID 83725 USA Boise State Univ Boise ID USA 83725 sci, Boise, ID 83725 USA
Citazione:
J.P. McNamara et al., "An analysis of an arctic channel network using a digital elevation model", GEOMORPHOLO, 29(3-4), 1999, pp. 339-353

Abstract

Drainage basins possess spatial patterns of similarity that can be characterized by universal qualities in the fractal dimension and the cumulative area distribution. Features called water tracks often drain hillslopes in basins with permafrost and impose significant control on the hydrologic response of watersheds. We analyzed the arrangement of channel networks and water tracks in Imnavait Creek in Northern Alaska to determine if basins with permafrost possess the same universal characteristics as basins without permafrost. Using digital elevation models (DEMs), we explored the hillslope/channel scaling regimes, the spatial distribution of mass through the cumulative area distribution, and the fractal characteristics of channel networks in the Kuparuk River basin in Northern Alaska. Fractal analysis, slope-areaanalysis, and field mapping suggest that water tracks are positioned on the hillslopes where channels should occur. Fully-developed channel networks,however, possess certain universal characteristics in aggregation patternsthat are manifested in a common cumulative area distribution. Imnavait Creek possesses those universal characteristics only above the scale of the hillslope water track, or when the drainage areas reach the main channels in the valley bottom. Our interpretation is that a rudimentary channel networkformed on the hillslopes, but never developed into a mature channel network because permafrost is limiting erosion. Consequently, the undissected hillslopes are extensive. Given the dependence of permafrost on a cold climate, a warming climate and subsequent degradation of permafrost may have significant impacts on the erosional development of channel networks in the Arctic. (C) 1999 Elsevier Science B.V. All rights reserved.

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Documento generato il 22/09/20 alle ore 20:48:51