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 wi nter. Major naleds also are likely to significantly 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 (monticules 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 cours 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. . 1973. Hydrologic reconnaissance of streams and springs in eastern Brooks Range, Alaska -July 1972. US. Geological Survey, Water Resources Division, Basic-Data Report. HOPKINS, D. M. 1967. The Cenozoic history of Beringiaa synthesis. In: Hopkins, D. M. SOKOLOV, B. L. 1973. Regime of naleds. In: Anisimova, N. P. et d., Ground Water in the Cryolithosphere. Hanover, New Hampshire: U.S. Army Cold Regions Research and Engineering Laboratory (Draft Translation 437). WAHRHAFTIO, c. 1965. Physiographic divisions of Alaska. US., Geological Survey, Professiorml Paper 482. WALKER, X. J. 1974. The Colville River and Beaufort Sea: some interactions. In: Reed, J. C. and Sater, J. E. (eds.), The Coast and Shelf of the Beaufort Sea.

No abstract

Stereograms showing channel and hillslope conditions in reach 1 of Redwood Creek near the Tall Trees Grove 'in 1936 (A), 1968(B), and 1973(C) 70 & 71 19. Stereograms showing channel and hillslope conditions in reach 1 of Redwood Creek in the vicinity of Prairie Creek and MacArthur Creek in 1936 (A), 1968 (B), and 1973(C) :-72 & 73 20. Vertically exaggerated stream profiles for Prairie Creek and its major tributaries-75 21. Ground photograph-natural channels-. 79 '22. Ground photograph-natural channels 79 23;' Ground photograph-cutover channel-81 24. Ground photograph-cutover channel 81 25. Mean monthly precipitation for Orick-Prairie Creek Park, and mean monthly runoff for Redwood Creek at Orick for water years 1954-1972 86 26. Means (x), standard deviations (S) and cumulative departures from the mean for selected Tainfall. and runoff parameters measured at Orick-Prairie Creek Park and Redwood Creek at Orick for water years 1954 through 1973 s-92 27. Means (x), standard deviations (S) and cumulative departures from the mean for selected rainfall and runoff parameters measured at Orick-Prairie Creek and Redwood Creek at Orick for periods of sustained high stream discharge during water years 1954 through 1973 ., ... .,..... '93 28. Historical record of annual rainfall and major floods for northwestern California. Graphs of cumulative annual departures from the mean annual rainfall are shown for Fort Gaston-Hoopa, Crescent City, Eureka, and Orick-Prairie Creek Park. All means are computed for th'e common interval, 1954' through 1973. Flood-producing storms arc shown in relation to the flood of,, ; December 1964. Solid bars indicate floods at least 4-O percent as large as that of 1964, and open bars indicate floods at least 20 percent as large as that of 1964. Rivers are indicated as follows: S

No abstract

Ac Know.!-s d gme n ts _ _ __ __ ____ ______ _______ _______. Basin description. ^-_ « _ __ _ _ i _________________ ._______^._ M ass movement and fluvial erosion-^ 11 Mass movement processes 12 Hillslope fluvial erosion processes 14 Persistence of erosional processes 14 Distribution and age of mass movement features 15 fVoor*______._________ _____.______ _^___ _________.______._______.__i_______-1Q V JL cC^J _ «»_ «« ~~ tii-* _ *-j__ L andslide occurrence related to hillslope steepness-' 21 Geologic controls of mass movement distribution-23 Other basic parameters influencing landslide distribution-26 Recent increases in erosion 30 Flood-producing storms in northwestern California 31 Recent flood-producing storms 32