USGS/Cascades Volcano Observatory, Vancouver, Washington
REPORT:
Post-Eruption Changes in Channel Geometry of Streams in the Toutle River
Drainage Basin, 1980-82, Mount St. Helens, Washington
--
D.F. Meyer, K.M. Nolan, and J.E. Dodge, 1986,
Post-Eruption Changes in Channel Geometry of Streams in the Toutle River
Drainage Basin, 1980-82, Mount St. Helens, Washington:
U.S. Geological Survey Open-File Report 85-412.
Abstract
The May 18, 1980, eruption of Mount St. Helens, Washington,
generated a debris avalanche,
lateral blast, lahars, and tephra deposits
that altered mainstem and tributary channels within the
Toutle River drainage basin. Channel cross sections were
monumented and surveyed on North Fork Toutle River and its tributaries,
on South Fork Toutle River, on Green River, and on Toutle River
in 1980 and 1981.
These streams drain the north and west flanks of the volcano.
The network of channel cross sections was 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 1980 through 1982.
Return to:
[Report Menu] ...
URL for CVO HomePage is:
<http://vulcan.wr.usgs.gov/home.html>
URL for this page is:
<http://vulcan.wr.usgs.gov/Volcanoes/MSH/Publications/OFR85-412/abstract.html>
If you have questions or comments please contact:
<GS-CVO-WEB@usgs.gov>
02/28/01, Lyn Topinka