Fire-related hyperconcentrated and debris flows on Storm King Mountain, Glenwood Springs, Colorado, USA |
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| Authors: | S H Cannon P S Powers W Z Savage |
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| Institution: | (1) U.S. Geological Survey, Central Region Geologic Hazards Team, Box 25046, Denver Federal Center, MS 966, Denver, CO 80225, USA, US |
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| Abstract: | The South Canyon Fire of July 1994 burned 800 ha of vegetation on Storm King Mountain near Glenwood Springs, Colorado, USA.
On the night of 1 September 1994, in response to torrential rains, debris flows inundated seven areas along a 5-km length
of Interstate Highway 70. Mapping from aerial photographs, along with field observations and measurements, shows that the
September rainstorm eroded unconsolidated, burned surficial soil from the hillsides, flushed dry-ravel deposits from the tributary
channels, and transported loose, large material from the main channels. The hyperconcentrated flows and debris flows inundated
14 ha of Interstate Highway 70 with 70 000 m3 of material. Although the burned area was seeded in November 1994, the potential for continuing debris-flow activity remains.
Incision and entrainment of channel alluvium, as well as erosion of loose material from the hillslopes could result in future
debris- and hyperconcentrated-flow activity.
Received: 15 October 1996 / Accepted: 25 June 1997 |
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| Keywords: | Debris flow Hyperconcentrated flow Fire |
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