[ghsc-seminars] GHSC Seminar, Monday, May 21st @ 2pm: David George, USGS CVO, Vancouver, WA

[Mirus, Benjamin]

*NOTE ROOM CHANGE: 535 (this seminar only)*

*"**Computational modeling of landslides, debris-flows and more general
shallow flows with D-Claw**"*

*David George*
*USGS Cascades Volcano Observatory, Vancouver, WA*

D-Claw is a software package that we have developed for simulating
landslides, debris flows and related shallow flows. The software grew from
a synthesis of research involving, 1) mathematical models for debris-flow
physics developed over several decades (by Iverson and others at the USGS)
and informed by experiments at the USGS debris-flow flume facility and, 2)
numerical algorithms and software developed by an open-source community in
computational mathematics.

D-Claw's model equations govern a granular-fluid mixture with evolving
volume fractions. A key motivation that guided the model development, was
the ability to, not only model run-out dynamics, but accurately simulate
the initiation process and mobilization (or stabilization), which is
mediated by the evolution of pore-fluid pressure and the attendant changes
in shear resistance. Additionally, we sought numerical features such as
accurate inundation algorithms and adaptive mesh refinement, which
facilitates the efficient simulation of large-scale flows with high
resolution.

Some recent work with D-Claw exploits the fact that the model governs
evolving phase concentrations, and can be used to model fluid problems in
the absence of solid content. We have therefore explored using D-Claw to
simulate multifaceted problems that involve the interaction of
granular-fluid mixtures and bodies of water. Such problems include debris
flows that enter rivers and lakes, landslide-generated tsunamis, landslide
dams and outburst floods that entrain debris, and debris-laden tsunami
inundation.


*Monday, May 21st**, 2018*
*2-3*
*pm*
*​  (Mountain Time)*
*USGS, 1711 Illinois Street, Golden, CO*
*Fifth Floor Conference Room 535*

*Note: Please arrive *~5 minutes early* and *bring photo ID* for
airport-style security measures now in place at the USGS building.

Thank you,
GHSC Seminar Committee

Mirus, Ben - bbmirus at usgs.gov
Josh Rigler - erigler at usgs.gov
Oliver Boyd - olboyd at usgs.gov <oboyd at usgs.gov>

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