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Downstream dilution of a lahar: transition from debris flow to hyperconcentrated streamflow.

Water Resources Research

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Abstract

Nearly instantaneous melting of snow and ice by the March 19, 1982, eruption of Mount St. Helens, released a 4 X 106 m3 flood of water from the crater that was converted to a lahar (volcanic debris flow) through erosion and incorporation of sediment by the time it reached the base of the volcano. Over the next 81 km that it traveled down the Toutle River, the flood wave was progressively diluted through several mechanisms. A transformation from debris flow to hyperconcentrated streamflow began to occur about 27 km downstream from the crater, when the total sediment concentration had decreased to about 78% by weight (57% by volume).-from Authors

Additional Publication Details

Publication type:
Article
Publication Subtype:
Journal Article
Title:
Downstream dilution of a lahar: transition from debris flow to hyperconcentrated streamflow.
Series title:
Water Resources Research
Volume
21
Issue:
10
Year Published:
1985
Language:
English
Larger Work Type:
Article
Larger Work Subtype:
Journal Article
Larger Work Title:
Water Resources Research
First page:
1511
Last page:
1524
Number of Pages:
14