The interaction of ash flows with ridges

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doi: 10.1007/s004450050215
Authors:Woods, A. W.; Bursik, M. I.; Kurbatov, A. V.
Author Affiliations:Primary:
Univ. Bristol, School Mathematics, Bristol, United Kingdom
Volume Title:Bulletin of Volcanology
Source:for the [Bulletin of Volcanology, 60(1), p.38-51. Publisher: Springer International] International Association of Volcanology and Chemistry of the Earth's Interior (IAVCEI), Heidelberg, International. ISSN: 0258-8900
Publication Date:1998
Note:In English. 32 refs.; illus.
Summary:Ash flows may pass entirely over very small ridges, but may partially be blocked by intermediate-sized ridges, with a fraction reflected upstream as a travelling bore and with the fraction that passes over becoming hydraulically controlled at the ridge crest. If the ridges are high enough flows are totally blocked. The minimum ridge height that leads to total blocking has a complex variation with distance from source. This and other variables are examined by laboratory experiments and theoretical modelling. These indicate that a flow with mass fluxes > 108-109 kg/s can partially scale barriers as high as 1000 m at distances of tens of kilometres from source. [E.H.F.]
Sections:Petrology
Subsections:Volcanology
Subjects:Ash flows; Deposition; Experimental studies; Mounds; Theoretical models; Topography
Abstract Numbers:99M/893
Record ID:2000067681
Copyright Information:GeoRef, Copyright 2019 American Geosciences Institute. Reference includes data from Mineralogical Abstracts, United Kingdom, Twickenham, United Kingdom, Reference includes data from Geoline, Bundesanstalt fur Geowissenschaften und Rohstoffe
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