CSDMS - User contributions [en]

User:Echoi

2019-05-21T22:18:38Z

Echoi:

{{Signup information member
|First name member=Eunseo
|Last name member=Choi
|Institute member=University of Memphis
|Department member=Center for Earthquake Research and Information
|Postal address 1 member=3890 Central Ave.
|City member=Memphis
|Postal code member=38152
|Country member=United States
|State member=Tennessee
|Confirm email member=echoi2@memphis.edu
|Work phone member=9016784923
|Fax member=9016784734
|Website member=http://www.ceri.memphis.edu/
|Working group member=Terrestrial Working Group, Geodynamics Focus Research Group, Artificial Intelligence & Machine Learning Initiative
|Emaillist group member=yes
|Description of your CSDMS-related interests member=interaction between tectonics and surface processes
|Memberagreement=I have read and agree to the Privacy Policy
|How did you learn about CSDMS member=from colleagues
}}

2019 CSDMS meeting-099

2019-03-24T06:32:49Z

Echoi: Created page with "{{CSDMS meeting personal information template-2019 |CSDMS meeting first name=EUNSEO |CSDMS meeting last name=CHOI |CSDMS meeting institute=The University of Memphis |CSDMS mee..."

{{CSDMS meeting personal information template-2019
|CSDMS meeting first name=EUNSEO
|CSDMS meeting last name=CHOI
|CSDMS meeting institute=The University of Memphis
|CSDMS meeting city=MEMPHIS
|CSDMS meeting country=United States
|CSDMS meeting state=Tennessee
|CSDMS meeting email address=echoi2@memphis.edu
|CSDMS meeting phone=901-678-4923
}}
{{CSDMS meeting scholar and pre-meeting2019
|CSDMS meeting pre-conference2019=None
}}
{{CSDMS meeting select clinics1 2019
|CSDMS_meeting_select_clinics1_2019=3) Pangeo - Scalable Geoscience Tools Python
}}
{{CSDMS meeting select clinics2 2019
|CSDMS_meeting_select_clinics2_2019=2) Hydroshare - Data
}}
{{CSDMS meeting select clinics3 2019
|CSDMS_meeting_select_clinics3_2019=1) CUDA-enabled DES3D
}}
{{CSDMS scholarships yes no
|CSDMS meeting scholarships=No
}}
{{CSDMS meeting abstract yes no 2019
|CSDMS meeting abstract submit=No
}}
{{CSDMS meeting abstract title temp2019}}
{{CSDMS meeting abstract template 2019}}
{{blank line template}}

Meeting confirmation CTSP 2018-076

2018-02-15T04:52:57Z

Echoi: Created page with "{{Meeting confirmation personal information |CSDMSmeetingPerson=Echoi |MeetingAcceptDecline=Accept }} {{Meeting logistics |Hotelnights=Tuesday April 24, Wednesday April 25, Th..."

{{Meeting confirmation personal information
|CSDMSmeetingPerson=Echoi
|MeetingAcceptDecline=Accept
}}
{{Meeting logistics
|Hotelnights=Tuesday April 24, Wednesday April 25, Thursday April 26
|MultipleRoomMate=Yes
|RoomGender=Male
|DinnerYesNo=Yes
|MainCourse=Chicken
}}
{{Meeting abstract yes no
|CSDMS meeting abstract submit=Yes
}}
{{CSDMS meeting abstract title temp CTSP
|CSDMS_meeting_abstract_title=Coupling of DynEarthSol3D and Badlands: Status and Prospects
}}

Meeting application CTSP 2018-053

2018-01-02T16:46:41Z

Echoi:

{{Meeting personal information
|CSDMS meeting first name=Eunseo
|CSDMS meeting last name=Choi
|CSDMS meeting affiliation=The University of Memphis
|CSDMS meeting city=Memphis
|CSDMS meeting country=United States
|CSDMS meeting state=Tennessee
|CSDMS meeting email address=3890 Central Ave.
|CSDMS meeting phone=9016784923
}}
{{Meeting statement interest
|Meetingstatement_of_interest_submit=The importance of interactions between tectonic and surface processes is becoming widely recognized. I have considered this type of interaction in numerical models that involved sedimentation in half grabens associated with large-offset normal faults. I also have experiences with coupling a three-dimensional long-term tectonic modeling code with a full-fledged surface process modeling code in varying degrees of generality. At this workshop, I would like to share my experiences with other participants as well as catch up with latest advances and accomplishments in this field of research.
}}
{{Meeting abstract yes no
|CSDMS meeting abstract submit=Yes
}}

Meeting application CTSP 2018-053

2018-01-02T16:45:26Z

Echoi:

{{Meeting personal information
|CSDMS meeting first name=Eunseo
|CSDMS meeting last name=Choi
|CSDMS meeting affiliation=The University of Memphis
|CSDMS meeting city=Memphis
|CSDMS meeting country=United States
|CSDMS meeting state=Tennessee
|CSDMS meeting email address=3890 Central Ave.
|CSDMS meeting phone=9016784923
}}
{{Meeting statement interest
|Meetingstatement_of_interest_submit=The importance of interactions between tectonic and surface processes is becoming widely recognized. I have considered this type of interaction in numerical models that involved sedimentation in half grabens associated with large-offset normal faults. I also have experiences with coupling a three-dimensional long-term tectonic modeling code with a full-fledged surface process modeling code in varying degree of generality. At this workshop, I would like to share my experiences with other participants as well as catch up with latest advances and accomplishments in this field of research.
}}
{{Meeting abstract yes no
|CSDMS meeting abstract submit=Yes
}}

Meeting application CTSP 2018-053

2018-01-02T16:43:03Z

Echoi: Created page with "{{Meeting personal information |CSDMS meeting first name=Eunseo |CSDMS meeting last name=The University of Memphis |CSDMS meeting affiliation=The |CSDMS meeting city=Memphis |..."

{{Meeting personal information
|CSDMS meeting first name=Eunseo
|CSDMS meeting last name=The University of Memphis
|CSDMS meeting affiliation=The
|CSDMS meeting city=Memphis
|CSDMS meeting country=United States
|CSDMS meeting state=Tennessee
|CSDMS meeting email address=3890 Central Ave.
|CSDMS meeting phone=9016784923
}}
{{Meeting statement interest
|Meetingstatement_of_interest_submit=The importance of interactions between tectonic and surface processes is becoming widely recognized. I have considered this type of interaction in numerical models that involved sedimentation in half grabens associated with large-offset normal faults. I also have experiences with coupling a three-dimensional long-term tectonic modeling code with a full-fledged surface process modeling code in varying degree of generality. At this workshop, I would like to share my experiences with other participants as well as catch up with latest advances and accomplishments in this field of research.
}}
{{Meeting abstract yes no
|CSDMS meeting abstract submit=Yes
}}

User:Echoi

2013-03-25T15:13:37Z

Echoi:

{{Signup information member
|First name member=Eunseo
|Last name member=Choi
|Institute member=University of Memphis
|Department member=Center for Earthquake Research and Information
|Postal address 1 member=3890 Central Ave.
|Postal address 2 member=
|City member=Memphis
|Postal code member=38152
|Country member=United States
|State member=Tennessee
|Confirm email member=echoi2@memphis.edu
|Work phone member=9016784923
|Cell phone member=
|Fax member=9016784734
|Website member=http://www.ceri.memphis.edu/
|Working group member=Terrestrial Working Group, Geodynamics Focus Research Group
|Description of your CSDMS-related interests member=interaction between tectonics and surface processes
|How did you learn about CSDMS member=from colleagues
}}

Meeting:Abstract 2011 CSDMS meeting-066

2011-10-02T17:19:23Z

Echoi:

{{CSDMS meeting personal information template
|CSDMS meeting first name=Eunseo
|CSDMS meeting last name=Choi
|CSDMS meeting institute=Lamont-Doherty Earth Observatory
|CSDMS meeting city=Palisades
|CSDMS meeting state=New York
|CSDMS meeting country=USA
|CSDMS meeting email address=echoi@ldeo.columbia.edu
|CSDMS meeting phone=845-365-8813
}}
{{CSDMS meeting abstract yes no
|CSDMS meeting abstract submit=Yes
}}
{{CSDMS meeting abstract title template
|CSDMS meeting abstract title=Landslide rupture and length-depth scaling
}}
{{CSDMS meeting abstract template
|CSDMS meeting abstract=Landslides are often assumed to exhibit self-similarity in their failure geometry, and thus a linear scaling between slip depth and rupture length. This assumption has important implications for the prediction of large landslide volumes and for the estimation of erosion budgets by mass-wasting. Nevertheless, some field data indicate a break from self-similarity and imply that, in some circumstances, landslide depth may scale non-linearly with length. Here we test the simple scaling hypothesis by numerical experiment. Modeling is performed with SNAC (StGermaiN Analysis of Continua), a 3D community code originally designed to model viscoelastoplastic deformation on a crustal scale and newly adapted to treating hillslope failure. SNAC employs a parallelized, Lagrangian, explicit finite-difference scheme and dynamic relaxation to solve static, quasi-static and steady-state problems. Landslide rupture is treated as emergent shear localization under strain-weakening Mohr-Coulomb plasticity. We model only the initial slip and early motion of a landslide; granular flow during the runout phase is not considered. A set of 2+1D simulations of failures spanning lengths of 50–400m suffice to vindicate cross-sectional self-similarity—absent any dominant depth scale or trend in the variation of cohesion—and a depth-length ratio of 11–15% is recorded. An interesting by-product of the choice of experimental geometry is some unanticipated complexity in the evolution of the slip plane. Failure initiates at the toe, propagates upslope, and asymptotically parallels the planar upper boundary. However, a connected failure surface is only achieved once a secondary rupture has propagated downwards into this slip plane from the upper breakaway zone. The broader outcome of our numerical experiments is a demonstration of how 3D continuum modeling of soil and rock-slope failure, and the study of their rich behavior, is now feasible using non-commercial code on supercomputing platforms.
}}
{{CSDMS meeting abstract figures
|CSDMS meeting abstract figure=Abstract 066 CSDMS meeting 2011 Landslide z-L paper, Fig2- plasticStrain allScales3a.png
|CSDMS meeting abstract figure caption=Simulated landslide geometries and model plastic strain (colors): (a) L = 50 m, (b) L = 100 m, (c) L = 200 m, (d) L = 400 m.
}}
{{blank line template}}
{{CSDMS meeting program template1
|CSDMS meeting first day choice=Geo-Modeling
|CSDMS meeting second day choice=CHILD
|CSDMS meeting third day choice=I can not attend a clinic
}}
{{CSDMS meeting logistics template
|Attend all days=Yes
|CSDMS arrange hotel=Yes
|Check in date=2011/10/27
|Check out date=2011/10/30
|Share a room=Yes
|CSDMS meeting dinner=No
|CSDMS meeting funding=Registration, Air travel, Lodging
|CSDMS registration support=0
|CSDMS airtravel support=0
|CSDMS lodging support=0
}}

Meeting:Abstract 2011 CSDMS meeting-066

2011-09-13T18:54:01Z

Echoi:

{{#ifeq:{{#expr:{{#time: U}}>{{#expr:
{{#expr:{{#switch: {{#sub:{{REVISIONTIMESTAMP}}|4|-8}}
| 7 = 1309478400
| 8 = 1312156800
| 9 = 1314835200
| 10 = 1317427200
}} + {{#expr:{{#sub:{{REVISIONTIMESTAMP}}|6|-6}}*24*3600}} + {{#expr:{{#sub:{{REVISIONTIMESTAMP}}|8|-4}}*3600}} + {{#expr:{{#sub:{{REVISIONTIMESTAMP}}|10|-2}} *60}} + {{#sub:{{REVISIONTIMESTAMP}}|12}} -64800}}+30 }} }}|1|{{CSDMS meeting 2011 paid}}|{{CSDMS meeting 2011 not paid}} }}<br>
{{CSDMS meeting personal information template
|CSDMS meeting first name=Eunseo
|CSDMS meeting last name=Choi
|CSDMS meeting institute=Lamont-Doherty Earth Observatory
|CSDMS meeting city=Palisades
|CSDMS meeting state=New York
|CSDMS meeting country=USA
|CSDMS meeting email address=echoi@ldeo.columbia.edu
|CSDMS meeting phone=845-365-8813
}}
{{CSDMS meeting abstract yes no
|CSDMS meeting abstract submit=Yes
}}
{{CSDMS meeting abstract title template
|CSDMS meeting abstract title=Landslide rupture and length-depth scaling
}}
{{CSDMS meeting abstract template
|CSDMS meeting abstract=Landslides are often assumed to exhibit self-similarity in their failure geometry, and thus a linear scaling between slip depth and rupture length. This assumption has important implications for the prediction of large landslide volumes and for the estimation of erosion budgets by mass-wasting. Nevertheless, some field data indicate a break from self-similarity and imply that, in some circumstances, landslide depth may scale non-linearly with length. Here we test the simple scaling hypothesis by numerical experiment. Modeling is performed with SNAC (StGermaiN Analysis of Continua), a 3D community code originally designed to model viscoelastoplastic deformation on a crustal scale and newly adapted to treating hillslope failure. SNAC employs a parallelized, Lagrangian, explicit finite-difference scheme and dynamic relaxation to solve static, quasi-static and steady-state problems. Landslide rupture is treated as emergent shear localization under strain-weakening Mohr-Coulomb plasticity. We model only the initial slip and early motion of a landslide; granular flow during the runout phase is not considered. A set of 2+1D simulations of failures spanning lengths of 50–400m suffice to vindicate cross-sectional self-similarity—absent any dominant depth scale or trend in the variation of cohesion—and a depth-length ratio of 11–15% is recorded. An interesting by-product of the choice of experimental geometry is some unanticipated complexity in the evolution of the slip plane. Failure initiates at the toe, propagates upslope, and asymptotically parallels the planar upper boundary. However, a connected failure surface is only achieved once a secondary rupture has propagated downwards into this slip plane from the upper breakaway zone. The broader outcome of our numerical experiments is a demonstration of how 3D continuum modeling of soil and rock-slope failure, and the study of their rich behavior, is now feasible using non-commercial code on supercomputing platforms.
}}
{{CSDMS meeting abstract figures
|CSDMS meeting abstract figure=Landslide z-L paper, Fig2- plasticStrain allScales3a.pdf
|CSDMS meeting abstract figure caption=Simulated landslide geometries and model plastic strain (colors): (a) L = 50 m, (b) L = 100 m, (c) L = 200 m, (d) L = 400 m.
}}
{{blank line template}}
{{CSDMS meeting program template
|CSDMS meeting first hydrological choice=I am not interested
|CSDMS meeting second hydrological choice=I am not interested
|CSDMS meeting first terrestrial choice=CHILD
|CSDMS meeting second terrestrial choice=Delft3D
|CSDMS meeting first coastal choice=I am not interested
|CSDMS meeting second coastal choice=I am not interested
|CSDMS meeting first marine choice=I am not interested
|CSDMS meeting second marine choice=I am not interested
|CSDMS meeting first carbonate choice=I am not interested
|CSDMS meeting second carbonate choice=I am not interested
|CSDMS meeting first tool choice=I am not interested
|CSDMS meeting second tool choice=I am not interested
}}
{{CSDMS meeting logistics template
|Attend all days=Yes
|CSDMS arrange hotel=Yes
|Check in date=2011/10/27
|Check out date=2011/10/30
|Share a room=Yes
|CSDMS meeting dinner=No
|CSDMS meeting funding=Registration, Air travel, Lodging
|CSDMS registration support=0
|CSDMS airtravel support=0
|CSDMS lodging support=0
}}

Meeting:Abstract 2011 CSDMS meeting-066

2011-09-13T18:47:04Z

Echoi: Created page with " {{#ifeq:{{#expr:{{#time: U}}>{{#expr: {{#expr:{{#switch: {{#sub:{{REVISIONTIMESTAMP}}|4|-8}} | 7 = 1309478400 | 8 = 1312156800 | 9 = 1314835200 | 10 = 1317427200 }} + {{#expr:{{..."

File:Landslide z-L paper, Fig2- plasticStrain allScales3a.pdf

2011-09-13T18:28:40Z

Echoi:

Model:SNAC

2011-06-20T15:27:41Z

Echoi: Created page with "{{Modeler information |First name=Eunseo |Last name=Choi |Type of contact=Model developer |Institute / Organization=Lamont-Doherty Earth Observatory |Postal address 1=P.O. Box 10..."

{{Modeler information
|First name=Eunseo
|Last name=Choi
|Type of contact=Model developer
|Institute / Organization=Lamont-Doherty Earth Observatory
|Postal address 1=P.O. Box 1000
|Postal address 2=61 Rt. 9W
|Town / City=Palisades
|Postal code=10964
|State=New York
|Country=United States
|Email address=echoi@ldeo.columbia.edu
|Phone=845-365-8813
|Fax=845-365-8156
}}
{{Model identity
|Model type=Single
|Categories=Terrestrial
|Spatial dimensions=3D
|Spatialscale=Continental, Regional-Scale, Landscape-Scale
|One-line model description=An updated Lagrangian explicit finite difference code for modeling a finitely deforming elasto-visco-plastic solid in 3D.
|Extended model description=SNAC can solve momentum and heat energy balance equations in 3D solid with complicated rheology. Lagrangian description of motion adopted in SNAC makes it easy to monitor surface deformation during a crustal or continental scale tectonic event as well as introduce surface processes into a model.
}}
{{Model technical information
|Supported platforms=Linux, Mac OS
|Programming language=C
|Code optimized=Single Processor, Parallel
Computing
|Start year development=2003
|Does model development still take place?=Yes
|Model availability=As code
|Source code availability=Through web repository
|Source web address=http://www.geodynamics.org/cig/software/snac/
|Program license type=GPL v2
|OpenMI compliant=No not possible
|CCA component=No not possible
|IRF interface=No not possible
|CMT component=Not yet
|Memory requirements=tipically < 1 GB
|Typical run time=hours to days
}}
{{Input - Output description
|Describe input parameters=In XML format, the following groups of parameters are specified:

simulation control group: total model time, time step, damping, etc.
plugins: elasticity, viscoelasticity, temperature solver, etc.
domain description group: domain size, element numbers, etc.
initial and boundary conditions group
|Input format=ASCII
|Other input format=XML
|Describe output parameters=Nodal field data: velocity, temperature
Element-centered (discontinuous) field data: strain rate, stress, plastic strain, etc.
|Output format=Binary
|Pre-processing software needed?=No
|Post-processing software needed?=Yes
|Describe post-processing software=A simple C program that converts binary outputs into ascii data file in the VTK format.
|Visualization software needed?=Yes
|Other visualization software=ParaView or anything that can visualize VTK files.
}}
{{Process description model
|Describe processes represented by the model=Momentum balance in solid continuum under gravity and kinematic boundary conditions.
|Describe key physical parameters and equations=Newton's second law in the dynamic form is damped to acquire static or quasi-static solutions. Among importance parameters are those for a constitutive model (elastic moduli, linear and non-linear viscosity, and parameters for strain-weakening plasticity) and damping parameters.
|Describe length scale and resolution constraints=No inherent length scale or resolution as long as the continuum hypothesis is satisfied. A practical constraint on length scale and resolution is computational cost.
|Describe time scale and resolution constraints=Time scale is essentially set by the Courant condition: practially by P-wave velocity or maxwell time according to the constitutive model being considered. However, the mass scaling technique allows significantly increased time steps values from the usual dynamic one.
|Describe any numerical limitations and issues=Extreme deformation of mesh is expected during large deformationin the updated Lagrangian formulation but prevented by regridding. The numerical diffusion due to regridding, however, can sometime make structures (e.g. shear localization) lose desired sharpness.

Regridding itself fails from time to time.
}}
{{Model testing}}
{{Users groups model}}
{{Documentation model
|Provide key papers on model if any=Choi, E., L. Lavier, and M. Gurnis (2008), Thermomechanics of mid-ocean ridge segmentation, Phys. Earth Planet. Inter., 171, 374-386, (dx. doi. org/ 10. 1016/ j. pepi. 2008. 08. 010 ).
|Manual model available=Yes
|Model manual=Snac.pdf,
|Model website if any=http://www.geodynamics.org/cig/software/snac/
}}
{{Additional comments model}}

{{#ifexist:Template:{{#sub:{{PAGENAME}}|0|1}}{{#sub:{{lc:{{PAGENAME}}}}|1}} download stats | ==Download statistics==
{{{{#sub:{{PAGENAME}}|0|1}}{{#sub:{{lc:{{PAGENAME}}}}|1}} download stats}} | }}

==Introduction==

== History ==

== Papers ==

== Issues ==

== Help ==

== Input Files ==

== Output Files ==

== Download source code ==

File:Snac.pdf

2011-06-20T15:10:03Z

Echoi: SNAC Manual File

SNAC Manual File

User:Echoi

2011-06-16T19:42:26Z

Echoi:

{{Signup information member
|First name member=Eunseo
|Last name member=Choi
|Institute member=Lamont-Doherty Earth Observatory
|Department member=Marine Geology and Geophysics
|Postal address 1 member=P.O. Box 1000
|Postal address 2 member=61 Rt. 9W
|City member=Palisades
|Postal code member=10964
|State member=New York
|Country member=USA
|Confirm email member=echoi@ldeo.columbia.edu
|Work phone member=8453658813
|Cell phone member=6262008275
|Fax member=8453658156
|Website member=http://www.ldeo.columbia.edu/~echoi
|Working group member=Terrestrial Working Group
|Description of your CSDMS-related interests member=interaction between tectonics and surface processes
|How did you learn about CSDMS member=from colleagues
}}