USGS/Cascades Volcano Observatory, Vancouver, Washington
REPORT:
Post-Eruption Changes in Channel Geometry of Streams in the Toutle River
Drainage Basin, 1983-85, Mount St. Helens, Washington
--
D.F. Meyer and J.E. Dodge, 1988,
Post-Eruption Changes in Channel Geometry of Streams in the Toutle River
Drainage Basin, 1983-85, Mount St. Helens, Washington:
U.S. Geological Survey Open-File Report 87-549
Abstract
The May 18, 1980, eruption of Mount St. Helens generated a debris avalanche,
lateral blast, lahars and tephra deposits that altered mainstream and tributary
channels within the Toutle River drainage basin. Channel cross sections were
monumented and surveyed on the North Fork Toutle River and its tributaries,
South Fork Toutle River, Green River, and Toutle River in 1980 and 1981. These
streams drain the north and west flanks of the volcano. The network of channel
cross sections has been resurveyed annually. Selected cross sections were
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. These data can be used to determine erosion
rates, and to identify sources and storage sites of sediment in sediment budget
computations. This report presents channel cross-section profiles constructed
from the survey data collected during water years 1983-85.
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06/05/00, Lyn Topinka