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Gradients in stream power influence lateral and downstream sediment flux in floods

John D. Gartner, William B. Dade, Carl E. Renshaw, Francis J. Magilligan and Eirik M. Buraas
Gradients in stream power influence lateral and downstream sediment flux in floods
Geology (Boulder) (November 2015) 43 (11): 983-986

Abstract

Locations of landslides, bank failures, and floodplain deposition during recent intense flooding in Vermont and Colorado (USA) were spatially nonuniform, indicating that some reaches are more prone to these types of geologic hazards. These three key flood effects signal redistribution of sediment across landscapes, reflecting hillslope-channel coupling and the sources and/or sinks of material. We show that spatial gradients in total stream power (Omega ) provide critical additional information beyond at-a-point Omega magnitudes for predicting which reaches are likely to be susceptible to these hazards during floods. Field tests in four rivers (watershed areas 0.8-180 km2) indicate that downstream increases in Omega coincide with erosion and mass wasting into channels, and downstream decreases in Omega are associated with floodplain deposition. Our analytical approach, supported by field evidence, predicts geologic hazards and, more broadly, sources and sinks of material along rivers. These are critical concerns from a practical and theoretical standpoint.


ISSN: 0091-7613
EISSN: 1943-2682
Coden: GLGYBA
Serial Title: Geology (Boulder)
Serial Volume: 43
Serial Issue: 11
Title: Gradients in stream power influence lateral and downstream sediment flux in floods
Affiliation: Dartmouth College, Department of Earth Science, Hanover, NH, United States
Pages: 983-986
Published: 201511
Text Language: English
Publisher: Geological Society of America (GSA), Boulder, CO, United States
References: 33
Accession Number: 2016-005369
Categories: HydrogeologyEnvironmental geology
Document Type: Serial
Bibliographic Level: Analytic
Annotation: GSA Data Repository item 2015331
Illustration Description: illus. incl. sketch maps
N40°01'00" - N40°01'60", W105°17'60" - W105°17'60"
N40°02'60" - N40°04'00", W105°19'60" - W105°19'60"
N43°10'00" - N43°10'00", W72°40'00" - W72°30'00"
N43°49'60" - N43°49'60", W72°49'60" - W72°49'60"
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute.
Update Code: 201603
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