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Hydrogeomorphic effects of explosive volcanic eruptions on drainage basins

Annual Review of Earth and Planetary Sciences

By:
and
DOI: 10.1146/annurev-earth-060313-054913

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Abstract

Explosive eruptions can severely disturb landscapes downwind or downstream of volcanoes by damaging vegetation and depositing large volumes of erodible fragmental material. As a result, fluxes of water and sediment in affected drainage basins can increase dramatically. System-disturbing processes associated with explosive eruptions include tephra fall, pyroclastic density currents, debris avalanches, and lahars—processes that have greater impacts on water and sediment discharges than lava-flow emplacement. Geo-morphic responses to such disturbances can extend far downstream, persist for decades, and be hazardous. The severity of disturbances to a drainage basin is a function of the specific volcanic process acting, as well as distance from the volcano and magnitude of the eruption. Postdisturbance unit-area sediment yields are among the world's highest; such yields commonly result in abundant redeposition of sand and gravel in distal river reaches, which causes severe channel aggradation and instability. Response to volcanic disturbance can result in socioeconomic consequences more damaging than the direct impacts of the eruption itself.

Additional Publication Details

Publication type:
Article
Publication Subtype:
Journal Article
Title:
Hydrogeomorphic effects of explosive volcanic eruptions on drainage basins
Series title:
Annual Review of Earth and Planetary Sciences
DOI:
10.1146/annurev-earth-060313-054913
Volume
42
Year Published:
2014
Language:
English
Publisher:
Annual Reviews
Contributing office(s):
Volcano Science Center
Description:
39 p.
Larger Work Type:
Article
Larger Work Subtype:
Journal Article
Larger Work Title:
Annual Review of Earth and Planetary Sciences
First page:
469
Last page:
507