Sediment erosion and delivery from Toutle River basin after the 1980 eruption of Mount St. Helens: A 30-year perspective
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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.
Suggested Citation
Major, J.J., Mosbrucker, A.R., Spicer, K.R., 2018, Sediment erosion and delivery from Toutle River basin after the 1980 eruption of Mount St. Helens: A 30-year perspective, chap. of Ecological responses at Mount St. Helens: Revisited 35 years after the 1980 eruption, p. 19-44, https://doi.org/10.1007/978-1-4939-7451-1_2.
| 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 |
| Publication Date | January 30, 2018 |
| 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 |