NG-TEPHRA: A massively parallel, Nimrod/G-enabled volcanic simulation in the grid and the cloud

Santiago Núñez, Blair Bethwaite, José Brenes, Gustavo Barrantes, José Castro, Eduardo Malavassiz, David Abramson

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

Volcanoes are a principal factor of hazard across the Pacific Rim, with their focus of interest mostly divided into pyroclastic flows and ash deposition. The latter has significantly more impact due to its widespread geographical reach and prolonged effects in human activities and health. TEPHRA is a volcanic ash dispersion model based on a simple version of the advection-diffusion Suzuki model, which has been revisited and modified for the Irazú volcano in Costa Rica. A full parameter exploration is necessary in this particular case (albeit not sufficient) due to scarce observational data. We present in this paper the model, its assumptions and limitations as well as application lifecycle with resulting ash distribution graphics. The computational experimental settings are described, in particular the use of Nimrod/G with respect to non-homogeneous parameter sweeps and its impact on execution time. We also analyze the implementation of a new parameter discard mechanism common to e-Science experiments where sequential generation of new parameter sets has to be complemented with an early verification in order to avoid allocation of CPU time to non-valid scenarios. Finally four sample 100K-scenario runs are analyzed for both traditional HPC clustering and Cloud computing resources in the Amazon EC2 Cloud.

Original languageEnglish (US)
Title of host publicationProceedings - 2010 6th IEEE International Conference on e-Science, eScience 2010
Pages129-136
Number of pages8
DOIs
StatePublished - 2010
Externally publishedYes
Event2010 6th IEEE International Conference on e-Science, eScience 2010 - Brisbane, QLD, Australia
Duration: Dec 7 2010Dec 10 2010

Publication series

NameProceedings - 2010 6th IEEE International Conference on e-Science, eScience 2010

Conference

Conference2010 6th IEEE International Conference on e-Science, eScience 2010
Country/TerritoryAustralia
CityBrisbane, QLD
Period12/7/1012/10/10

Keywords

  • Ash dispersion
  • Cloud computing
  • Computational volcanology
  • Grid computing
  • Nimrod
  • Parametric sweep
  • Suzuki advection-diffusion model
  • Tephra

ASJC Scopus subject areas

  • Computer Science (miscellaneous)

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