<div dir="ltr"><div class="gmail_extra"><div class="gmail_quote"><b style="font-family:arial,helvetica,sans-serif;font-size:12.8px"><font color="#000000">NOTE ROOM CHANGE: 535 (this seminar only)</font></b></div><div class="gmail_quote"><b style="color:rgb(255,0,0);font-family:arial,helvetica,sans-serif;font-size:12.8px"><br></b></div><div class="gmail_quote"><b style="color:rgb(255,0,0);font-family:arial,helvetica,sans-serif;font-size:12.8px">"</b><font color="#ff0000" face="arial, helvetica, sans-serif"><span style="font-size:12.8px"><b>Computational modeling of landslides, debris-flows and more general shallow flows with D-Claw</b></span></font><b style="color:rgb(255,0,0);font-family:arial,helvetica,sans-serif;font-size:12.8px">"</b></div><div class="gmail_quote"><font face="arial, helvetica, sans-serif"><span style="font-size:12.8px"><b><br></b></span></font><span style="font-size:12.8px;font-family:arial,helvetica,sans-serif"><b>David George</b></span></div><div class="gmail_quote"><i style="font-size:12.8px;font-family:arial,helvetica,sans-serif">USGS Cascades Volcano Observatory, Vancouver, WA</i> <br><div class="gmail_quote"><br></div><div class="gmail_quote">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.</div><div class="gmail_quote"><br></div><div class="gmail_quote">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.</div><div class="gmail_quote"><br></div><div class="gmail_quote">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.</div><div><br></div></div><div class="gmail_quote"><b style="font-size:12.8px"><div style="font-size:small;display:inline"><font face="arial, helvetica, sans-serif"><div style="display:inline"><font face="arial, helvetica, sans-serif"><br></font></div></font></div></b></div><div class="gmail_quote"><b style="font-size:12.8px"><div style="font-size:small;display:inline"><font face="arial, helvetica, sans-serif"><div style="display:inline"><font face="arial, helvetica, sans-serif">Monday, May 21st</font></div></font></div></b><b style="font-size:12.8px"><font face="arial, helvetica, sans-serif">, 2018</font></b><br></div><div class="gmail_quote"><b style="font-size:12.8px"><span style="font-size:13px"><font face="arial, helvetica, sans-serif"><div style="font-size:small;display:inline"><div style="display:inline"><div style="display:inline"><div style="display:inline">2-3</div></div></div></div></font></span></b><b style="font-size:12.8px"><span style="font-size:13px"><font face="arial, helvetica, sans-serif"><div style="font-size:small;display:inline"><div style="display:inline"><div style="display:inline"><div style="display:inline">pm</div></div></div></div></font></span></b><b style="font-size:12.8px"><span style="font-size:13px"><font face="arial, helvetica, sans-serif"><div style="font-size:small;display:inline"><div style="display:inline"><div style="display:inline"></div> </div></div> (Mountain Time)</font></span></b><br><b style="font-size:12.8px;font-family:arial,helvetica,sans-serif"><span style="font-size:13px">USGS, 1711 Illinois Street, Golden, CO</span></b><br><font face="arial, helvetica, sans-serif"><b>Fifth Floor Conference Room 535</b><br></font><span style="font-size:12.8px;font-family:arial,helvetica,sans-serif"><br></span></div><div class="gmail_quote"><span style="font-size:12.8px;font-family:arial,helvetica,sans-serif">*Note: Please arrive <u>~5 minutes early</u> and <u>bring photo ID</u> for airport-style </span><span style="font-size:12.8px;font-family:arial,helvetica,sans-serif">security</span><span style="font-size:12.8px;font-family:arial,helvetica,sans-serif"> measure<wbr>s now in place at the USGS building.</span><br><span style="font-size:12.8px"><br></span><span style="font-size:13px">Thank you,</span><br><span style="font-size:13px"><span class="m_7378331646219374107gmail-m_-8586038301793833330m_2174399009776966998gmail-m_3536024389969136014gmail-m_6564323528617604720gmail-m_-3202867471772006187m_-3474394390109531423m_-6180755618559776416m_-6692829955733685287gmail-m_-1920778670233885335gmail-m_2928417918433606341m_548290485840828435m_3628773897655229900gmail-m_7446487874202752399m_-8264889372741220741gmail-m_5431511284334585236gmail-m_-1882990626170291808m_9106775657748341738gmail-m_6925426022411937115m_7055967733504661449gmail-m_-8968070735390492279m_4896026561608388806gmail-m_3918809983636524111m_7068817575649352729m_-6172873775242136948gmail-m_-4303968599703518853gmail-m_2043882230405221244gmail-m_2480559937188047531m_-1887565490609744462m_8131614935401267798m_6252585815979993878gmail-m_-5616756539997506461gmail-m_3957397034944864967gmail-m_-5590660146057455466gmail-m_2010942344340859242gmail-m_4771098111974711889gmail-il"><span class="m_7378331646219374107gmail-m_-8586038301793833330m_2174399009776966998gmail-m_3536024389969136014gmail-m_6564323528617604720gmail-m_-3202867471772006187m_-3474394390109531423m_-6180755618559776416m_-6692829955733685287gmail-m_-1920778670233885335gmail-m_2928417918433606341m_548290485840828435m_3628773897655229900gmail-m_7446487874202752399m_-8264889372741220741gmail-m_5431511284334585236gmail-m_-1882990626170291808m_9106775657748341738gmail-m_6925426022411937115m_7055967733504661449gmail-m_-8968070735390492279m_4896026561608388806gmail-m_3918809983636524111m_7068817575649352729m_-6172873775242136948gmail-m_-4303968599703518853gmail-m_2043882230405221244gmail-m_2480559937188047531m_-1887565490609744462m_8131614935401267798m_6252585815979993878gmail-m_-5616756539997506461gmail-m_3957397034944864967gmail-il"><span class="m_7378331646219374107gmail-m_-8586038301793833330m_2174399009776966998gmail-m_3536024389969136014gmail-m_6564323528617604720gmail-m_-3202867471772006187m_-3474394390109531423m_-6180755618559776416m_-6692829955733685287gmail-m_-1920778670233885335gmail-m_2928417918433606341m_548290485840828435m_3628773897655229900gmail-m_7446487874202752399m_-8264889372741220741gmail-m_5431511284334585236gmail-m_-1882990626170291808m_9106775657748341738gmail-m_6925426022411937115m_7055967733504661449gmail-m_-8968070735390492279m_4896026561608388806gmail-m_3918809983636524111m_7068817575649352729m_-6172873775242136948gmail-m_-4303968599703518853gmail-m_2043882230405221244gmail-m_2480559937188047531m_-1887565490609744462m_8131614935401267798m_6252585815979993878gmail-m_-5616756539997506461gmail-il">GHSC</span></span></span><font face="arial, sans-serif"> </font><span class="m_7378331646219374107gmail-m_-8586038301793833330m_2174399009776966998gmail-m_3536024389969136014gmail-m_6564323528617604720gmail-m_-3202867471772006187m_-3474394390109531423m_-6180755618559776416m_-6692829955733685287gmail-m_-1920778670233885335gmail-m_2928417918433606341m_548290485840828435m_3628773897655229900gmail-m_7446487874202752399m_-8264889372741220741gmail-m_5431511284334585236gmail-m_-1882990626170291808m_9106775657748341738gmail-m_6925426022411937115m_7055967733504661449gmail-m_-8968070735390492279m_4896026561608388806gmail-m_3918809983636524111m_7068817575649352729m_-6172873775242136948gmail-m_-4303968599703518853gmail-m_2043882230405221244gmail-m_2480559937188047531m_-1887565490609744462m_8131614935401267798m_6252585815979993878gmail-m_-5616756539997506461gmail-m_3957397034944864967gmail-m_-5590660146057455466gmail-m_2010942344340859242gmail-m_4771098111974711889gmail-m_337406015407620904gmail-m_-5330926199930091226m_647861723187015620gmail-il"><span class="m_7378331646219374107gmail-m_-8586038301793833330m_2174399009776966998gmail-m_3536024389969136014gmail-m_6564323528617604720gmail-m_-3202867471772006187m_-3474394390109531423m_-6180755618559776416m_-6692829955733685287gmail-m_-1920778670233885335gmail-m_2928417918433606341m_548290485840828435m_3628773897655229900gmail-m_7446487874202752399m_-8264889372741220741gmail-m_5431511284334585236gmail-m_-1882990626170291808m_9106775657748341738gmail-m_6925426022411937115m_7055967733504661449gmail-m_-8968070735390492279m_4896026561608388806gmail-m_3918809983636524111m_7068817575649352729m_-6172873775242136948gmail-m_-4303968599703518853gmail-m_2043882230405221244gmail-m_2480559937188047531m_-1887565490609744462m_8131614935401267798m_6252585815979993878gmail-m_-5616756539997506461gmail-m_3957397034944864967gmail-m_-5590660146057455466gmail-m_2010942344340859242gmail-m_4771098111974711889gmail-il">Seminar</span></span></span><font face="arial, sans-serif" style="font-size:13px"> Committee </font><br><span style="font-size:12.8px"><br></span><span style="font-size:12.8px">Mirus, Ben - </span><a href="mailto:bbmirus@usgs.gov" style="font-size:12.8px" target="_blank">bbmirus@usgs.gov</a><br><span style="font-size:13px">Josh Rigler - </span><a href="mailto:erigler@usgs.gov" style="font-size:13px" target="_blank">erigler@usgs.gov</a><br><span style="font-size:13px">Oliver Boyd - </span><a href="mailto:oboyd@usgs.gov" style="font-size:13px" target="_blank">olboyd@usgs.gov</a><br><br>______________________________<wbr>_________________<br>ghsc-seminars mailing list<br><a href="mailto:ghsc-seminars@geohazards.usgs.gov" target="_blank">ghsc-seminars@geohazards.usgs.<wbr>gov</a><br><a href="https://geohazards.usgs.gov/mailman/listinfo/ghsc-seminars" rel="noreferrer" target="_blank">https://geohazards.usgs.gov/ma<wbr>ilman/listinfo/ghsc-seminars</a><br><div><div class="gmail_extra"><br></div></div>
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