Sediment erosion and delivery from Toutle River basin after the 1980 eruption of Mount St. Helens: A 30-year perspective

By: , and 
Edited by: Charles Crisafulli and V. Dale

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Abstract

Exceptional sediment yields persist in Toutle River valley more than 30 years after the major 1980 eruption of Mount St. Helens. Differencing of decadal-scale digital elevation models shows the elevated load comes largely from persistent lateral channel erosion across the debris-avalanche deposit. Since the mid-1980s, rates of channel-bed-elevation change have diminished, and magnitudes of lateral erosion have outpaced those of channel incision. A digital elevation model of difference from 1999 to 2009 shows erosion across the debris-avalanche deposit is more spatially distributed compared to a model from 1987 to 1999, in which erosion was strongly focused along specific reaches of the channel.

Additional publication details

Publication type Book chapter
Publication Subtype Book Chapter
Title Sediment erosion and delivery from Toutle River basin after the 1980 eruption of Mount St. Helens: A 30-year perspective
DOI 10.1007/978-1-4939-7451-1_2
Year Published 2018
Language English
Publisher Springer
Contributing office(s) Volcano Science Center
Description 26 p.
Larger Work Type Book
Larger Work Title Ecological responses at Mount St. Helens: Revisited 35 years after the 1980 eruption
First page 19
Last page 44
Other Geospatial Mount St. Helens