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Record Search Query: ServiceParameters>MODELS>GEOLOGIC/TECTONIC/PALEOCLIMATE MODELS

Conflow: A numerical program for conduit flow and thermodynamics
Entry ID: USGS_CONFLOW

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Summary
Abstract: Conflow is a model that calculates flow properties (pressure, vesicularity, and
some 35 other parameters) as a function of vertical position within a volcanic
conduit during a steady-state eruption. The model idealizes the magma-gas
mixture as a single homogeneous fluid and calculates gas exsolution under the
assumption of equilibrium conditions. These are the same assumptions on which
classic conduit models (e.g. Wilson and Head, 1981) have been based. They are
most appropriate when applied to eruptions of rapidly ascending magma (basaltic
lava-fountain eruptions, and Plinian or sub-Plinian eruptions of intermediate
or silicic magmas) that contains abundant nucleation sites (microlites, for
example) for bubble growth.

The program runs on Windows-based PCs running Windows 95 or later.
Related URL
Description: Executable Conflow program for Windows 95/98/NT/XP may be downloaded from this
URL.

Description: USGS Open-File Report 00209 on Conflow. A full report in PDF may be accessed
from this URL. Users may also download an executable version of the program
from this site as well as the Fortran source code.
Multimedia Sample
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Caption Description:  Conflow screen shot

Service Citation
Originators: Larry G. Mastin and Mark S. Ghiorso
Title: A Numerical Program for Steady-State Flow of Magma-Gas Mixtures Through Vertical Eruptive Conduits
Provider: U.S. Geological Survey
URL: http://vulcan.wr.usgs.gov/Projects/Mastin/Publications/OFR00-209/fr...
Service Keywords
MODELS >GEOLOGIC/TECTONIC/PALEOCLIMATE MODELS Parameter Definition

ISO Topic Category
GEOSCIENTIFIC INFORMATION
Access Constraints No constraints
Use Constraints Please cite service providers, Larry G. Mastin (USGS) and Mark S. Ghiorso
(University of Washington).
Ancillary Keywords
VOLCANOES
VOLCANIC CONDUITS
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Service Provider
DOI/USGS/GD/VHP/CVO > Cascades Volcano Observatory, Volcano Hazards Program, Geological Division, U.S. Geological Survey, U.S. Department of the Interior Supplemental Info
Service Organization URL: http://vulcan.wr.usgs.gov/

Service Provider Personnel
Name: LARRY G. MASTIN
Phone: (360) 993-8925
Fax: (360) 993-8980
Email: lgmastin at usgs.gov
Contact Address:
Cascades Volcano Observatory
USGS
1300 SE Cardinal Court, Bldg. 10, Suite 100
City: Vancouver
Province or State: Washington
Postal Code: 98683
Country: USA
Distribution Media
Distribution_Media: Online (HTTP)
Distribution_Size: 2.5 Mbytes
Distribution_Format: Executable program for Windows 95/98/NT
Fees: None
Personnel
LARRY G. MASTIN
Role: TECHNICAL CONTACT
Phone: (360) 993-8925
Fax: (360) 993-8980
Email: lgmastin at usgs.gov
Contact Address:
Cascades Volcano Observatory
USGS
1300 SE Cardinal Court, Bldg. 10, Suite 100
City: Vancouver
Province or State: Washington
Postal Code: 98683
Country: USA
View entire list
Publications/References
Mastin, L. G. and M. S. Ghiorso, 2000, A Numerical Program for Steady-State
Flow of Magma-Gas Mixtures Through Vertical Eruptive Conduits: U.S. Geological
Survey Open-File Report 00209,
&http://vulcan.wr.usgs.gov/Projects/Mastin/Publications/OFR00-209/fr...
l&.
Creation and Review Dates
SERF Creation Date: 2004-05-11
SERF Last Revision Date: 2007-11-19
Future SERF Review Date: 2005-05-11
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