USGS/Cascades Volcano Observatory, Vancouver, Washington
REPORT:
Changes in Channel Geomorphology of Six Eruption-Affected Tributaries of the
Lewis River, 1980-82, Mount St. Helens, Washington
--
Holly A. Martinson, Steven D. Finneran, and Lyn Topinka, 1984,
Changes in Channel Geomorphology of Six Eruption-Affected Tributaries of the
Lewis River, 1980-82, Mount St. Helens, Washington:
U.S. Geological Survey Open-File Report 84-614, 113p.
Abstract
The May 18, 1980, eruption of Mount St. Helens generated a lateral blast,
lahars, and tephra deposits that altered tributary channels in the Lewis River
drainage basin. In order to assess potential flood hazards, study channel
adjustments, and construct a sediment budget for the perturbed drainages on the
east and southeast flanks of the volcano, channel cross sections were monumented
and surveyed on Pine Creek, Muddy River, and Smith Creek during September and
October of 1980. Additional cross sections were monumented and surveyed on Swift
Creek, Bean Creek, and Clearwater Creek during the summer of 1981. The network
of 88 channel cross sections has been resurveyed annually. Selected cross
sections have been surveyed more frequently, following periods of higher flow.
The repetitive cross-section surveys provide measurements of bank erosion or
accretion and of channel erosion or aggradation. This report presents channel
cross-section profiles constructed from the survey data collected during water
years 1980-82.
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02/27/01, Lyn Topinka