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Dendrogeomorphic evidence of debris flow frequency and magnitude at Mount Shasta, California

Environmental Geology and Water Sciences

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DOI: 10.1007/BF02509918

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Abstract

Debris-flow deposits and woody vegetation adjacent to and growing within the channels of Whitney, Bolam, Mud, Ash, and Panthe creeks provide a 300-year record of debris-flow frequency at Mount Shasta Dendrochronologic (tree-ring) dating methods for the debris flows proved consistent with available documented records of debris flows Nine debris flows not reported in the historic record were documented and dated dendrochronologically. The oldest tree-ring date for a mudflow was about 1670 Combined geomorphic and botanical evidence shows that debris flows are a common occurrence at Mount Shasta Debris flows traveling at least 2 km have occurred at the rate of about 8 3 per century Smaller debris flows occur substantially more frequently and usually do not proceed as far downslope as larger debris flows. Cyclic scouring and filling by debris flows, in and adjacent to the stream channels, is suggested by dendrogeomorphic evidence and appears to be related to their magnitude and frequency Debris flows, small and large, may be the major surficial geomorphic agent in the vicinity of mount Shasta, sculpturing the channels and developing large alluvial fans ?? 1984 Springer-Verlag New York Inc.

Additional Publication Details

Publication type:
Article
Publication Subtype:
Journal Article
Title:
Dendrogeomorphic evidence of debris flow frequency and magnitude at Mount Shasta, California
Series title:
Environmental Geology and Water Sciences
DOI:
10.1007/BF02509918
Volume
6
Issue:
2
Year Published:
1984
Language:
English
Publisher location:
Springer-Verlag
Larger Work Type:
Article
Larger Work Subtype:
Journal Article
First page:
121
Last page:
128
Number of Pages:
8