Distribution and character of naled in northeastern Alaska
ABSTRACT. Satellite imagery and high- and low-altitude aerial photography of the North Slope of Alaska indicate that naleds (features formed during river icing) are widespread east of the Colville River but less abundant to its west. Where naleds occur, stream channels are wide and often braided. Th...
| Main Authors: | , , |
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| Format: | Text |
| Language: | English |
| Published: |
1977
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| Online Access: | http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.495.5779 http://pubs.aina.ucalgary.ca/arctic/arctic30-1-28.pdf |
| Summary: | ABSTRACT. Satellite imagery and high- and low-altitude aerial photography of the North Slope of Alaska indicate that naleds (features formed during river icing) are widespread east of the Colville River but less abundant to its west. Where naleds occur, stream channels are wide and often braided. Their distribution can be related to changes in stream gradient and to the occurrence of springs. Large naleds, such as occur on the Kongakut River, often survive the summer melt season to form the nucleus of icing in the succeeding winter. Major naleds also are likely to signi-ficantly influence the nature of permafrost in their immediate vicinity. A map of naleds may serve as a guide to sources of perennially flawing water. R&UM?k R6partition et caractdrisffques des naleds dans le nord-est de l’Alaska. Les indications transmises par satellite et les photos prises B haute et basse altitude au-dessus de la partie septentrionale de l’Alaska montrent que les naleds (monti-cules se formant au cours de la glaciation des rivihres) se retrouvent en grande quantité B l’est de la rivitse COIvilfe, mais en petite quantith b I’ouest de la même rivikre. LB oh se forment les naleds, le lit des cours d’eau est large et souvent tortueux. La répartition des naleds correspond aux changements survenant dans la dblivité des c o u r s d’eau et B l’apparition de sources. Les gros naleds, comme ceux qu’on trouve sur la rivihre Kongakut, rbistent souvent aux fontes de l’6té et forment le noyau de glaciation de lsver suivant. Les plus gros naleds influencent probablement de façon significative la nature du pergClisol dans leur voisinage immbdiat. Une carte des naleds p o d t constituer un guide des cours d‘eau coulant en permanence. |
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