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- W2110271946 abstract "Mudflows and bentonitic debris flows are found at numerous locations around the globe. Those that occur in arctic regions or at high elevations are unique in that the base material normally will remain frozen during periods of flow activity. The influence of a frozen base on flow morphology and frequency of activity was investigated for large-scale bentonitic debris flows along the Colville River near Umiat on the North Slope. These features originate in bentonitic detritus slumping from bluffs 150-200 m high. When the material becomes sufficiently hydrated it flows downslope leaving slickensided, fluted channels ranging in depth from 0.5 to 2 m and from 2 to 12 m wide. During July and August flow velocities up to 6 m/minute were observed. Data were obtained that yielded relations among precipitation, water content, flow rate and frequency, thaw depth, and channel morphology. Flow was observed as initiating in the upper, steeper parts of the bluffs along an initial slip zone at the upper boundary of the permafrost. However, snow meltwater and thawing of the active layer were not sufficient to bring about the critical relationship between water content and slope angle required to initiate flow. As with mud- and debris-flows in warmer regions, frequency of flow was found to be closely related to the occurrence of precipitation. End_of_Article - Last_Page 2495------------" @default.
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- W2110271946 date "1970-01-01" @default.
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- W2110271946 title "Bentonitic Debris Flows near Umiat, Alaska: ABSTRACT" @default.
- W2110271946 doi "https://doi.org/10.1306/5d25cd53-16c1-11d7-8645000102c1865d" @default.
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