<html xmlns:v="urn:schemas-microsoft-com:vml" xmlns:o="urn:schemas-microsoft-com:office:office" xmlns:w="urn:schemas-microsoft-com:office:word" xmlns:m="http://schemas.microsoft.com/office/2004/12/omml" xmlns="http://www.w3.org/TR/REC-html40">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=Windows-1252">
<meta name="Generator" content="Microsoft Word 15 (filtered medium)">
<!--[if !mso]><style>v\:* {behavior:url(#default#VML);}
o\:* {behavior:url(#default#VML);}
w\:* {behavior:url(#default#VML);}
.shape {behavior:url(#default#VML);}
</style><![endif]--><style><!--
/* Font Definitions */
@font-face
{font-family:"Cambria Math";
panose-1:2 4 5 3 5 4 6 3 2 4;}
@font-face
{font-family:Calibri;
panose-1:2 15 5 2 2 2 4 3 2 4;}
@font-face
{font-family:"Calibri Light";
panose-1:2 15 3 2 2 2 4 3 2 4;}
@font-face
{font-family:"Segoe UI";
panose-1:2 11 5 2 4 2 4 2 2 3;}
@font-face
{font-family:"Segoe UI Semibold";
panose-1:2 11 7 2 4 2 4 2 2 3;}
/* Style Definitions */
p.MsoNormal, li.MsoNormal, div.MsoNormal
{margin:0in;
font-size:11.0pt;
font-family:"Calibri",sans-serif;}
a:link, span.MsoHyperlink
{mso-style-priority:99;
color:#0563C1;
text-decoration:underline;}
span.EmailStyle17
{mso-style-type:personal-compose;
font-family:"Calibri",sans-serif;
color:windowtext;}
p.xxxxxxxxxxxmsonormal, li.xxxxxxxxxxxmsonormal, div.xxxxxxxxxxxmsonormal
{mso-style-name:x_x_x_x_x_x_x_x_x_x_x_msonormal;
mso-margin-top-alt:auto;
margin-right:0in;
mso-margin-bottom-alt:auto;
margin-left:0in;
font-size:11.0pt;
font-family:"Calibri",sans-serif;}
.MsoChpDefault
{mso-style-type:export-only;
font-family:"Calibri",sans-serif;}
@page WordSection1
{size:8.5in 11.0in;
margin:1.0in 1.0in 1.0in 1.0in;}
div.WordSection1
{page:WordSection1;}
--></style>
</head>
<body lang="EN-US" link="#0563C1" vlink="#954F72" style="word-wrap:break-word">
<div class="WordSection1">
<p class="MsoNormal" style="background:white"><b><span style="font-size:12.0pt;font-family:"Calibri Light",sans-serif;color:black">Evaluating D-Claw debris flow modeling performance: effect of friction and segregation sub-models.</span></b><span style="font-size:10.5pt;color:#323130"><o:p></o:p></span></p>
<p class="MsoNormal" style="background:white"><span style="font-size:12.0pt;color:black"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:12.0pt;font-family:"Calibri Light",sans-serif;color:black">Speaker: </span><b>Ryan Jones</b><span style="font-size:12.0pt;color:black"><br>
</span><span style="font-size:12.0pt;font-family:"Calibri Light",sans-serif;color:black"> USGS,</span><span style="font-size:12.0pt;color:black"><br>
</span><span style="font-size:12.0pt;font-family:"Calibri Light",sans-serif;color:black"> GHSC</span><o:p></o:p></p>
<p class="MsoNormal" style="background:white"><span style="font-size:12.0pt;font-family:"Calibri Light",sans-serif;color:black">Location: online/virtual</span><span style="font-size:12.0pt;color:black"><o:p></o:p></span></p>
<p class="MsoNormal" style="background:white"><span style="font-size:12.0pt;font-family:"Calibri Light",sans-serif;color:#323130">Date/Time: Tuesday, January 18th, 2022, 10–11am MST</span><span style="font-size:10.5pt;color:#323130"><o:p></o:p></span></p>
<p class="MsoNormal" style="background:white"><span style="font-size:10.5pt;color:#323130"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:12.0pt;font-family:"Calibri Light",sans-serif;color:#201F1E">Abstract: </span>Two challenges to modeling debris flow behavior are parameter uncertainty and the great variation in kinematic behavior. The effect of
parameter uncertainty, which in the case of the D-Claw shallow flow model are material properties, can be reduced by having a low sensitivity to individual parameters and the model performing well across a wide range of plausible input parameters. The kinematics
of a debris flow vary from channelized flow to dispersive flow on an unconfined alluvial fan. Further, debris flows can form levees, creating a new channel that confines the flow on an otherwise unconfined slope. In this presentation I present new physics
sub-models, one for hysteric friction and one that includes the partial effects of segregation, added to D-Claw, adding to the existing static friction sub-model. I evaluate the performance of different combinations of the sub-models to form levees and to
simulate a debris flow experiment performed at the USGS flume near Blue River, OR. Results from a large number of simulations, covering a range of material properties, demonstrate the models capabilities to simulate the wide range of debris flow kinematics.<o:p></o:p></p>
<p class="xxxxxxxxxxxmsonormal" style="margin:0in;background:white"><span style="color:#201F1E"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:12.0pt;color:black"><img width="1296" height="968" style="width:13.5in;height:10.0833in" id="Picture_x0020_2" src="cid:image002.jpg@01D806F7.5715B9C0" alt="A person wearing a red jacket and hat standing in the snow
Description automatically generated with low confidence"></span><span style="font-size:12.0pt;color:black"><o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:12.0pt;color:black"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:12.0pt;font-family:"Calibri Light",sans-serif;color:#201F1E">Bio: </span>Ryan is a Mendenhall Fellow who joined the USGS mid-2021. He is working with the Landslide Hazard Program on modeling the runout and inundation
of post-fire debris flows. He received his PhD in Mechanical Engineering from Northwestern University in 2021 focusing on modeling fluid and granular surface flows. His current research focuses on the development, application, and assessment of debris flow
models towards the eventual application in debris flow hazard assessments.<o:p></o:p></p>
<p class="xxxxxxxxxxxmsonormal" style="margin:0in;background:white"><span style="color:#201F1E"><o:p> </o:p></span></p>
<p class="xxxxxxxxxxxmsonormal" style="margin:0in;background:white"><span style="color:#201F1E"><o:p> </o:p></span></p>
<p class="xxxxxxxxxxxmsonormal" style="margin:0in;background:white"><span style="font-size:12.0pt;font-family:"Calibri Light",sans-serif;color:#323130">GHSC Seminar Committee: Oliver Boyd <<a href="mailto:olboyd@usgs.gov" title="mailto:olboyd@usgs.gov"><span style="color:#AC32FA">olboyd@usgs.gov</span></a>>,
Josh Rigler <<a href="mailto:erigler@usgs.gov" title="mailto:erigler@usgs.gov"><span style="color:#AC32FA">erigler@usgs.gov</span></a>>, Francis Rengers <<a href="mailto:frengers@usgs.gov" title="mailto:frengers@usgs.gov"><span style="color:#AC32FA">frengers@usgs.gov</span></a>></span><span style="color:#201F1E"><o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:12.0pt;color:black"><o:p> </o:p></span></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><span style="font-size:18.0pt;font-family:"Segoe UI",sans-serif;color:#252424">Microsoft Teams meeting</span><span style="font-family:"Segoe UI",sans-serif;color:#252424"><o:p></o:p></span></p>
<p class="MsoNormal"><b><span style="font-size:10.5pt;font-family:"Segoe UI",sans-serif;color:#252424">Join on your computer or mobile app</span></b><b><span style="font-family:"Segoe UI",sans-serif;color:#252424"><o:p></o:p></span></b></p>
<p class="MsoNormal"><span style="font-family:"Segoe UI",sans-serif;color:#252424"><a href="https://gcc02.safelinks.protection.outlook.com/?url=https%3A%2F%2Fteams.microsoft.com%2Fl%2Fmeetup-join%2F19%253ac2adbed375bc4a899fed4be199db7610%2540thread.skype%2F1641921241646%3Fcontext%3D%257b%2522Tid%2522%253a%25220693b5ba-4b18-4d7b-9341-f32f400a5494%2522%252c%2522Oid%2522%253a%252254965c8b-9aaa-4f47-aac3-6688a4dd25c2%2522%257d&data=04%7C01%7Cghsc-seminars%40geohazards.usgs.gov%7C489ed15e37d14f7f36c108d9d5498d01%7C0693b5ba4b184d7b9341f32f400a5494%7C0%7C0%7C637775334130394333%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000&sdata=4TJ4op8Ux1xwUlCwKaO4u30ImAcmmJsdnymdUrexGXU%3D&reserved=0" originalsrc="https://teams.microsoft.com/l/meetup-join/19%3ac2adbed375bc4a899fed4be199db7610%40thread.skype/1641921241646?context=%7b%22Tid%22%3a%220693b5ba-4b18-4d7b-9341-f32f400a5494%22%2c%22Oid%22%3a%2254965c8b-9aaa-4f47-aac3-6688a4dd25c2%22%7d" shash="q6Mnk88jRuufm7A14T3fZkb9RmyGuicDcAf3gB3bx1yiox3yz2fPxcOWHxMtctUCVV1hm/xcsCTjW7UNJqginXdx5bu7DxzU6WmxVBN1Qmxna9SfEyxiOYJd0AFRgnjGb5xC500XyQgoVAfMns8aqeOIqwAPnyVb0z4iqFchLq4=" target="_blank" title="https://teams.microsoft.com/l/meetup-join/19%3ac2adbed375bc4a899fed4be199db7610%40thread.skype/1641921241646?context=%7b%22tid%22%3a%220693b5ba-4b18-4d7b-9341-f32f400a5494%22%2c%22oid%22%3a%2254965c8b-9aaa-4f47-aac3-6688a4dd25c2%22%7d"><span style="font-size:10.5pt;font-family:"Segoe UI Semibold",sans-serif;color:#6264A7">Click
here to join the meeting</span></a><o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Segoe UI",sans-serif;color:#252424"><a href="https://gcc02.safelinks.protection.outlook.com/?url=https%3A%2F%2Faka.ms%2FJoinTeamsMeeting&data=04%7C01%7Cghsc-seminars%40geohazards.usgs.gov%7C489ed15e37d14f7f36c108d9d5498d01%7C0693b5ba4b184d7b9341f32f400a5494%7C0%7C0%7C637775334130394333%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000&sdata=8iziUdC4UUucnS8CS4%2FDpAATWOUZYQfj2BS5QQ3BdNY%3D&reserved=0" originalsrc="https://aka.ms/JoinTeamsMeeting" shash="r6sE+KYtzei7/INCw2FdujFnmVmq6hmKsc00Ww0mg2+vqLEE/6k48yOvhtHV/DFPeu0W/DH1R5Ry78zhKBNaUERgBkjc7nQD5HUJ7x53DjS0wTKVu7TLXFUmQ1sdiX7foW/PetNLcN06fCzyFknLgyQXipiNlbW2zHsKXNwyZ6s=" target="_blank" title="https://aka.ms/jointeamsmeeting"><span style="font-size:10.5pt;color:#6264A7">Learn
More</span></a> | <a href="https://gcc02.safelinks.protection.outlook.com/?url=https%3A%2F%2Fteams.microsoft.com%2FmeetingOptions%2F%3ForganizerId%3D54965c8b-9aaa-4f47-aac3-6688a4dd25c2%26tenantId%3D0693b5ba-4b18-4d7b-9341-f32f400a5494%26threadId%3D19_c2adbed375bc4a899fed4be199db7610%40thread.skype%26messageId%3D1641921241646%26language%3Den-US&data=04%7C01%7Cghsc-seminars%40geohazards.usgs.gov%7C489ed15e37d14f7f36c108d9d5498d01%7C0693b5ba4b184d7b9341f32f400a5494%7C0%7C0%7C637775334130551012%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000&sdata=HqfjsNRZAIeoyZF9TbwzY1e4o508Xd1bAC6eIn367Wc%3D&reserved=0" originalsrc="https://teams.microsoft.com/meetingOptions/?organizerId=54965c8b-9aaa-4f47-aac3-6688a4dd25c2&tenantId=0693b5ba-4b18-4d7b-9341-f32f400a5494&threadId=19_c2adbed375bc4a899fed4be199db7610@thread.skype&messageId=1641921241646&language=en-US" shash="DAoIpNum9gD4Nh9gEzgckyjq4j1EmMmI4gCmyw/s8FJvJMwH95rnCnCxtYY8UdG9Dy5O5ugMAouuEO3M+E7gFwDVcyRV1OVMjSOjbwZzqsjp+X9CspJs5X1nA3TKgLzBcyvNxD6r9heZPEXSvRh3Iqm+yKwDQI0nqZ0wIZhTp0M=" target="_blank" title="https://teams.microsoft.com/meetingoptions/?organizerid=54965c8b-9aaa-4f47-aac3-6688a4dd25c2&tenantid=0693b5ba-4b18-4d7b-9341-f32f400a5494&threadid=19_c2adbed375bc4a899fed4be199db7610@thread.skype&messageid=1641921241646&language=en-us">
<span style="font-size:10.5pt;color:#6264A7">Meeting options</span></a><o:p></o:p></span></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
</div>
</body>
</html>