CSDMS - User contributions [en]

Meeting confirmation CTSP 2018-043

2018-02-08T04:52:17Z

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

{{Meeting confirmation personal information
|CSDMSmeetingPerson=Smccoy
|MeetingAcceptDecline=Accept
}}
{{Meeting logistics
|Hotelnights=Tuesday April 24, Wednesday April 25, Thursday April 26
|MultipleRoomMate=Yes
|RoomGender=Male
|RoomMatePreference=Brian Yanites
|DinnerYesNo=Yes
|MainCourse=Salmon
|DietaryRestrictions=no
}}
{{Meeting abstract yes no
|CSDMS meeting abstract submit=Yes
}}
{{CSDMS meeting abstract title temp CTSP
|CSDMS_meeting_abstract_title=TBD
}}

User:Smccoy

2018-01-15T05:24:27Z

Smccoy:

{{Signup information member
|First name member=Scott
|Last name member=McCoy
|Institute member=University of Nevada
|Postal address 1 member=University of Nevada, Geology and Geological Engineering
|Postal address 2 member=1664 N. Virginia, MS 0172
|City member=Reno
|Postal code member=89557
|Country member=United States
|State member=Nevada
|Confirm email member=scottmccoy@unr.edu
|Work phone member=7756827205
|Cell phone member=307-699-2375
|Working group member=Terrestrial Working Group, Hydrology Focus Research Group
|Emaillist group member=yes
|How did you learn about CSDMS member=Greg Tucker
}}

User:Smccoy

2018-01-15T05:23:25Z

Smccoy:

{{Signup information member
|First name member=Scott
|Last name member=McCoy
|Institute member=University of Nevada
|Postal address 1 member=University of Nevada, Geology and Geological Engineering
|Postal address 2 member=1664 N. Virginia, MS 0172
|City member=Reno
|Postal code member=80303
|Country member=United States
|State member=Nevada
|Confirm email member=scottmccoy@unr.edu
|Work phone member=7756827205
|Cell phone member=307-699-2375
|Working group member=Terrestrial Working Group, Hydrology Focus Research Group
|Emaillist group member=yes
|How did you learn about CSDMS member=Greg Tucker
}}

Meeting application CTSP 2018-087

2018-01-15T05:21:02Z

Smccoy: Created page with "{{Meeting personal information |CSDMS meeting first name=Scott |CSDMS meeting last name=University of Nevada |CSDMS meeting affiliation=University of Nevada |CSDMS meeting cit..."

{{Meeting personal information
|CSDMS meeting first name=Scott
|CSDMS meeting last name=University of Nevada
|CSDMS meeting affiliation=University of Nevada
|CSDMS meeting city=Reno, NV
|CSDMS meeting country=United States
|CSDMS meeting state=Nevada
|CSDMS meeting email address=University of Nevada, Geology and Geological Engineering
1664 N. Virginia, MS 0172
|CSDMS meeting phone=7756827205
}}
{{Meeting statement interest
|Meetingstatement_of_interest_submit=I would be attending this workshop as somebody who uses landscape evolution modeling on a daily basis from solving the simplest form of an advective-diffusion equation to pushing hard to integrate mechanics-based approaches from grain-scale and event-scale frameworks into landscape evolution modeling. I would like to attend this workshop to: (1) share and get feedback on new ideas I have regarding the means by which we can use drainage basin geometry and changes in basin geometry to map long-wavelength, low-magnitude surface uplift of the type expected from dynamic topography; (2) share and get feedback on ideas I have for using characteristics of the upper reaches of the network, those primarily traversed by debris flows, as a high-resolution metric of surface uplift; (3) share and get feedback on ideas for bringing “real” mechanics into landscape evolution modeling from grain-scale and event-scale frameworks; (4) expand my ideas and toolkit for ways of incorporating tectonics into landscape evolution models (I know there is more than uniform U); (5) become better integrated with the tectonics modelers and people interested in integrating tectonics into Earth surface processes models such that I could write competitive collaborative proposals.
}}
{{Meeting abstract yes no
|CSDMS meeting abstract submit=Yes
}}

HPCCprojects:Investigating controls on bedrock erosion by granular flows using an open source discrete element model

2013-05-31T17:22:42Z

Smccoy:

==Project description==


Although steep valleys are ubiquitous in mountainous terrain and there is evidence that episodic scour by debris flows is an important erosional process in these valleys, there is no agreed upon mechanical framework to describe debris flow incision into bedrock. Hence our goal is formulate a defensible stochastic debris flow incision rule.

We hypothesize that the rate of bedrock incision will scale with the product of the intensity at which flow particles impact the bedrock channel floor (measured as impact force or energy) and the impact flux. We use grain-scale numerical experiments (discrete element method simulations) of free-surface, gravity-driven granular flows to quantify how impact intensity and impact flux, and hence the rate at which debris flows incise bedrock, change as a function of field measureable channel and flow properties such as grain size, flow depth, and channel slope.

[[File:GSD.png|400px]][[File:FD.png|400px]]
[[File:Slope.png|400px]]

Probability density of basal normal impact force from simulated monodispersed flows decayed rapidly and in an exponential manner with increasing force magnitude. Only when monodispersed flows were replaced by broad grain size distributions, characteristic of natural debris flows, did the distributions of simulated impact forces have a similar form to those measured beneath the natural flows. These results highlight the important role flow grain size can have on basal impact force.

As either bed inclination or flow depth was increased in the simulated flows, the mean and the spread of the impact force and impact energy distribution increased as well and in a nonlinear fashion. Bed impact flux was largely decoupled from the downstream flux of particles and was a linearly decreasing function of slope once slope increased beyond a threshold value. Incision rate, which should scale as the product of impact energy and impact flux, increased as a nonlinear function of slope. Steep landscapes in which millennial scale erosion rates have been quantified display a similar nonlinear relationship between erosion rate and channel gradient. This suggests that the grain-scale mechanics quantified here could place strong controls on steepland morphology that evolves over thousands to millions of years.

==Time-line==


This project was part of my Ph.D., which is now finished. But new questions keep emerging so the project is ongoing.

==Models in use==


A modified version of the open source discrete element code called LIGGGHTS. http://cfdem.dcs-computing.com/?q=OpenSourceDEM

==Users==


Scott McCoy
Greg Tucker

==Funding==


This research was supported by the National Science Foundation (NSF) Graduate Fellowship, and NSF grants EAR 0643240 and EAR 0952247.

==Publications and presentations==


McCoy, S. W. (2012), Controls on Erosion and Transport of Mass by Debris Flows, PhD dissertation, University of Colorado.

McCoy, S.W., G.E. Tucker, J. W. Kean, J. A. Coe (2012), Granular Mechanics of Debris-Flow Incision: Measuring and Modeling Grain-Scale Impact Forces, Abstract EP41C-0810, 2012 Fall Meeting, AGU, San Francisco.

McCoy, S. W., G. E. Tucker, A. C. Whittaker, S. T. Lancaster, G. P. Roberts, and P. A. Cowie (2010), Debris flows and landscape evolution: Insight from topographic analysis, millennial erosion rates and grain-scale flow mechanics, in Geophysical Research Abstracts, vol. 12, pp. EGU2010–7399–1.



[[Category:Research project]]

HPCCprojects:Investigating controls on bedrock erosion by granular flows using an open source discrete element model

2013-05-31T17:21:24Z

Smccoy:

==Project description==


Although steep valleys are ubiquitous in mountainous terrain and there is evidence that episodic scour by debris flows is an important erosional process in these valleys, there is no agreed upon mechanical framework to describe debris flow incision into bedrock. Hence our goal is formulate a defensible stochastic debris flow incision rule.

We hypothesize that the rate of bedrock incision will scale with the product of the intensity at which flow particles impact the bedrock channel floor (measured as impact force or energy) and the impact flux. We use grain-scale numerical experiments (discrete element method simulations) of free-surface, gravity-driven granular flows to quantify how impact intensity and impact flux, and hence the rate at which debris flows incise bedrock, change as a function of field measureable channel and flow properties such as grain size, flow depth, and channel slope.

[[File:GSD.png|400px]][[File:FD.png|400px]]
[[File:Slope.png|400px]]

Probability density of basal normal force from simulated monodispersed flows decayed rapidly and in an exponential manner with increasing force magnitude. Only when monodispersed flows were replaced by broad grain size distributions, characteristic of natural debris flows, did the distributions of simulated impact forces have a similar form to those measured beneath the natural flows. These results highlight the important role flow grain size can have on basal impact force.

As either bed inclination or flow depth was increased in the simulated flows, the mean and the spread of the impact force and impact energy distribution increased as well and in a nonlinear fashion. Bed impact flux was largely decoupled from the downstream flux of particles and was a linearly decreasing function of slope once slope increased beyond a threshold value. Incision rate, which should scale as the product of impact energy and impact flux, increased as a nonlinear function of slope. Steep landscapes in which millennial scale erosion rates have been quantified display a similar nonlinear relationship between erosion rate and channel gradient. This suggests that the grain-scale mechanics quantified here could place strong controls on steepland morphology that evolves over thousands to millions of years.

==Time-line==


This project was part of my Ph.D., which is now finished. But new questions keep emerging so the project is ongoing.

==Models in use==


A modified version of the open source discrete element code called LIGGGHTS. http://cfdem.dcs-computing.com/?q=OpenSourceDEM

==Users==


Scott McCoy
Greg Tucker

==Funding==


This research was supported by the National Science Foundation (NSF) Graduate Fellowship, and NSF grants EAR 0643240 and EAR 0952247.

==Publications and presentations==


McCoy, S. W. (2012), Controls on Erosion and Transport of Mass by Debris Flows, PhD dissertation, University of Colorado.

McCoy, S.W., G.E. Tucker, J. W. Kean, J. A. Coe (2012), Granular Mechanics of Debris-Flow Incision: Measuring and Modeling Grain-Scale Impact Forces, Abstract EP41C-0810, 2012 Fall Meeting, AGU, San Francisco.

McCoy, S. W., G. E. Tucker, A. C. Whittaker, S. T. Lancaster, G. P. Roberts, and P. A. Cowie (2010), Debris flows and landscape evolution: Insight from topographic analysis, millennial erosion rates and grain-scale flow mechanics, in Geophysical Research Abstracts, vol. 12, pp. EGU2010–7399–1.



[[Category:Research project]]

HPCCprojects:Investigating controls on bedrock erosion by granular flows using an open source discrete element model

2013-05-31T16:23:20Z

Smccoy:

==Project description==


Although steep valleys are ubiquitous in mountainous terrain and there is evidence that episodic scour by debris flows is an important erosional process in these valleys, there is no agreed upon mechanical framework to describe debris flow incision into bedrock. Hence our goal is formulate a defensible stochastic debris flow incision rule.

We hypothesize that the rate of bedrock incision will scale with the product of the intensity at which flow particles impact the bedrock channel floor (measured as impact force or energy) and the impact flux. We use grain-scale numerical experiments (discrete element method simulations) of free-surface, gravity-driven granular flows to quantify how impact intensity and impact flux, and hence the rate at which debris flows incise bedrock, change as a function of field measureable channel and flow properties such as grain size, flow depth, and channel slope.

[[File:GSD.png|400px]][[File:FD.png|400px]]
[[File:Slope.png|400px]]

Probability density of basal normal force from simulated monodispersed flows decayed rapidly and in an exponential manner with increasing force magnitude. Only when monodispersed flows were replaced by broad grain size distributions, characteristic of natural debris flows, did the distributions of simulated impact forces have a similar form to those measured beneath the natural flows. These results highlight the important role flow grain size can have on basal impact force.

As either bed inclination or flow depth was increased in the simulated flows, the mean and the spread of the impact force and impact energy distribution increased as well and in a nonlinear fashion. Bed impact flux was largely decoupled from the downstream flux of particles and was a linearly decreasing function of slope once slope increased beyond a threshold value. Incision rate, which should scale as the product of impact energy and impact flux, increased as a nonlinear function of slope. Steep landscapes in which millennial scale erosion rates have been quantified display a similar nonlinear relationship between erosion rate and channel gradient. This suggests that the grain-scale mechanics quantified here could place strong controls on steepland morphology that evolves over thousands to millions of years.

==Time-line==


This project was part of my Ph.D., which is now finished. But new question keep emerging so the project is ongoing.

==Models in use==


A modified version of the open source discrete element code called LIGGGHTS. http://cfdem.dcs-computing.com/?q=OpenSourceDEM

==Users==


Scott McCoy
Greg Tucker

==Funding==


This research was supported by the National Science Foundation (NSF) Graduate Fellowship, and NSF grants EAR 0643240 and EAR 0952247.

==Publications and presentations==


McCoy, S. W. (2012), Controls on Erosion and Transport of Mass by Debris Flows, PhD dissertation, University of Colorado.

McCoy, S.W., G.E. Tucker, J. W. Kean, J. A. Coe (2012), Granular Mechanics of Debris-Flow Incision: Measuring and Modeling Grain-Scale Impact Forces, Abstract EP41C-0810, 2012 Fall Meeting, AGU, San Francisco.

McCoy, S. W., G. E. Tucker, A. C. Whittaker, S. T. Lancaster, G. P. Roberts, and P. A. Cowie (2010), Debris flows and landscape evolution: Insight from topographic analysis, millennial erosion rates and grain-scale flow mechanics, in Geophysical Research Abstracts, vol. 12, pp. EGU2010–7399–1.



[[Category:Research project]]

File:Slope.png

2013-05-31T16:23:11Z

Smccoy: MsUpload

MsUpload

HPCCprojects:Investigating controls on bedrock erosion by granular flows using an open source discrete element model

2013-05-31T16:21:27Z

Smccoy:

==Project description==


Although steep valleys are ubiquitous in mountainous terrain and there is evidence that episodic scour by debris flows is an important erosional process in these valleys, there is no agreed upon mechanical framework to describe debris flow incision into bedrock. Hence our goal is formulate a defensible stochastic debris flow incision rule.

We hypothesize that the rate of bedrock incision will scale with the product of the intensity at which flow particles impact the bedrock channel floor (measured as impact force or energy) and the impact flux. We use grain-scale numerical experiments (discrete element method simulations) of free-surface, gravity-driven granular flows to quantify how impact intensity and impact flux, and hence the rate at which debris flows incise bedrock, change as a function of field measureable channel and flow properties such as grain size, flow depth, and channel slope.

[[File:GSD.png|400px]][[File:FD.png|400px]]

Probability density of basal normal force from simulated monodispersed flows decayed rapidly and in an exponential manner with increasing force magnitude. Only when monodispersed flows were replaced by broad grain size distributions, characteristic of natural debris flows, did the distributions of simulated impact forces have a similar form to those measured beneath the natural flows. These results highlight the important role flow grain size can have on basal impact force.

As either bed inclination or flow depth was increased in the simulated flows, the mean and the spread of the impact force and impact energy distribution increased as well and in a nonlinear fashion. Bed impact flux was largely decoupled from the downstream flux of particles and was a linearly decreasing function of slope once slope increased beyond a threshold value. Incision rate, which should scale as the product of impact energy and impact flux, increased as a nonlinear function of slope. Steep landscapes in which millennial scale erosion rates have been quantified display a similar nonlinear relationship between erosion rate and channel gradient. This suggests that the grain-scale mechanics quantified here could place strong controls on steepland morphology that evolves over thousands to millions of years.

==Time-line==


This project was part of my Ph.D., which is now finished. But new question keep emerging so the project is ongoing.

==Models in use==


A modified version of the open source discrete element code called LIGGGHTS. http://cfdem.dcs-computing.com/?q=OpenSourceDEM

==Users==


Scott McCoy
Greg Tucker

==Funding==


This research was supported by the National Science Foundation (NSF) Graduate Fellowship, and NSF grants EAR 0643240 and EAR 0952247.

==Publications and presentations==


McCoy, S. W. (2012), Controls on Erosion and Transport of Mass by Debris Flows, PhD dissertation, University of Colorado.

McCoy, S.W., G.E. Tucker, J. W. Kean, J. A. Coe (2012), Granular Mechanics of Debris-Flow Incision: Measuring and Modeling Grain-Scale Impact Forces, Abstract EP41C-0810, 2012 Fall Meeting, AGU, San Francisco.

McCoy, S. W., G. E. Tucker, A. C. Whittaker, S. T. Lancaster, G. P. Roberts, and P. A. Cowie (2010), Debris flows and landscape evolution: Insight from topographic analysis, millennial erosion rates and grain-scale flow mechanics, in Geophysical Research Abstracts, vol. 12, pp. EGU2010–7399–1.



[[Category:Research project]]

File:FD.png

2013-05-31T16:21:14Z

Smccoy: MsUpload

MsUpload

HPCCprojects:Investigating controls on bedrock erosion by granular flows using an open source discrete element model

2013-05-31T16:18:55Z

Smccoy:

==Project description==


Although steep valleys are ubiquitous in mountainous terrain and there is evidence that episodic scour by debris flows is an important erosional process in these valleys, there is no agreed upon mechanical framework to describe debris flow incision into bedrock. Hence our goal is formulate a defensible stochastic debris flow incision rule.

We hypothesize that the rate of bedrock incision will scale with the product of the intensity at which flow particles impact the bedrock channel floor (measured as impact force or energy) and the impact flux. We use grain-scale numerical experiments (discrete element method simulations) of free-surface, gravity-driven granular flows to quantify how impact intensity and impact flux, and hence the rate at which debris flows incise bedrock, change as a function of field measureable channel and flow properties such as grain size, flow depth, and channel slope.

[[File:GSD.png|400px]]

Probability density of basal normal force from simulated monodispersed flows decayed rapidly and in an exponential manner with increasing force magnitude. Only when monodispersed flows were replaced by broad grain size distributions, characteristic of natural debris flows, did the distributions of simulated impact forces have a similar form to those measured beneath the natural flows. These results highlight the important role flow grain size can have on basal impact force.

As either bed inclination or flow depth was increased in the simulated flows, the mean and the spread of the impact force and impact energy distribution increased as well and in a nonlinear fashion. Bed impact flux was largely decoupled from the downstream flux of particles and was a linearly decreasing function of slope once slope increased beyond a threshold value. Incision rate, which should scale as the product of impact energy and impact flux, increased as a nonlinear function of slope. Steep landscapes in which millennial scale erosion rates have been quantified display a similar nonlinear relationship between erosion rate and channel gradient. This suggests that the grain-scale mechanics quantified here could place strong controls on steepland morphology that evolves over thousands to millions of years.

==Time-line==


This project was part of my Ph.D., which is now finished. But new question keep emerging so the project is ongoing.

==Models in use==


A modified version of the open source discrete element code called LIGGGHTS. http://cfdem.dcs-computing.com/?q=OpenSourceDEM

==Users==


Scott McCoy
Greg Tucker

==Funding==


This research was supported by the National Science Foundation (NSF) Graduate Fellowship, and NSF grants EAR 0643240 and EAR 0952247.

==Publications and presentations==


McCoy, S. W. (2012), Controls on Erosion and Transport of Mass by Debris Flows, PhD dissertation, University of Colorado.

McCoy, S.W., G.E. Tucker, J. W. Kean, J. A. Coe (2012), Granular Mechanics of Debris-Flow Incision: Measuring and Modeling Grain-Scale Impact Forces, Abstract EP41C-0810, 2012 Fall Meeting, AGU, San Francisco.

McCoy, S. W., G. E. Tucker, A. C. Whittaker, S. T. Lancaster, G. P. Roberts, and P. A. Cowie (2010), Debris flows and landscape evolution: Insight from topographic analysis, millennial erosion rates and grain-scale flow mechanics, in Geophysical Research Abstracts, vol. 12, pp. EGU2010–7399–1.



[[Category:Research project]]

File:GSD.png

2013-05-31T16:18:23Z

Smccoy: MsUpload

MsUpload

HPCCprojects:Investigating controls on bedrock erosion by granular flows using an open source discrete element model

2013-05-31T16:17:28Z

Smccoy:

==Project description==


Although steep valleys are ubiquitous in mountainous terrain and there is evidence that episodic scour by debris flows is an important erosional process in these valleys, there is no agreed upon mechanical framework to describe debris flow incision into bedrock. Hence our goal is formulate a defensible stochastic debris flow incision rule.

We hypothesize that the rate of bedrock incision will scale with the product of the intensity at which flow particles impact the bedrock channel floor (measured as impact force or energy) and the impact flux. We use grain-scale numerical experiments (discrete element method simulations) of free-surface, gravity-driven granular flows to quantify how impact intensity and impact flux, and hence the rate at which debris flows incise bedrock, change as a function of field measureable channel and flow properties such as grain size, flow depth, and channel slope.

[[:Image:]]

Probability density of basal normal force from simulated monodispersed flows decayed rapidly and in an exponential manner with increasing force magnitude. Only when monodispersed flows were replaced by broad grain size distributions, characteristic of natural debris flows, did the distributions of simulated impact forces have a similar form to those measured beneath the natural flows. These results highlight the important role flow grain size can have on basal impact force.

As either bed inclination or flow depth was increased in the simulated flows, the mean and the spread of the impact force and impact energy distribution increased as well and in a nonlinear fashion. Bed impact flux was largely decoupled from the downstream flux of particles and was a linearly decreasing function of slope once slope increased beyond a threshold value. Incision rate, which should scale as the product of impact energy and impact flux, increased as a nonlinear function of slope. Steep landscapes in which millennial scale erosion rates have been quantified display a similar nonlinear relationship between erosion rate and channel gradient. This suggests that the grain-scale mechanics quantified here could place strong controls on steepland morphology that evolves over thousands to millions of years.

==Time-line==


This project was part of my Ph.D., which is now finished. But new question keep emerging so the project is ongoing.

==Models in use==


A modified version of the open source discrete element code called LIGGGHTS. http://cfdem.dcs-computing.com/?q=OpenSourceDEM

==Users==


Scott McCoy
Greg Tucker

==Funding==


This research was supported by the National Science Foundation (NSF) Graduate Fellowship, and NSF grants EAR 0643240 and EAR 0952247.

==Publications and presentations==


McCoy, S. W. (2012), Controls on Erosion and Transport of Mass by Debris Flows, PhD dissertation, University of Colorado.

McCoy, S.W., G.E. Tucker, J. W. Kean, J. A. Coe (2012), Granular Mechanics of Debris-Flow Incision: Measuring and Modeling Grain-Scale Impact Forces, Abstract EP41C-0810, 2012 Fall Meeting, AGU, San Francisco.

McCoy, S. W., G. E. Tucker, A. C. Whittaker, S. T. Lancaster, G. P. Roberts, and P. A. Cowie (2010), Debris flows and landscape evolution: Insight from topographic analysis, millennial erosion rates and grain-scale flow mechanics, in Geophysical Research Abstracts, vol. 12, pp. EGU2010–7399–1.



[[Category:Research project]]

HPCCprojects:Investigating controls on bedrock erosion by granular flows using an open source discrete element model

2013-05-31T16:17:04Z

Smccoy:

==Project description==


Although steep valleys are ubiquitous in mountainous terrain and there is evidence that episodic scour by debris flows is an important erosional process in these valleys, there is no agreed upon mechanical framework to describe debris flow incision into bedrock. Hence our goal is formulate a defensible stochastic debris flow incision rule.

We hypothesize that the rate of bedrock incision will scale with the product of the intensity at which flow particles impact the bedrock channel floor (measured as impact force or energy) and the impact flux. We use grain-scale numerical experiments (discrete element method simulations) of free-surface, gravity-driven granular flows to quantify how impact intensity and impact flux, and hence the rate at which debris flows incise bedrock, change as a function of field measureable channel and flow properties such as grain size, flow depth, and channel slope.

[[:Image:]]

Probability density of basal normal force from simulated monodispersed flows decayed rapidly and in an exponential manner with increasing force magnitude. Only when monodispersed flows were replaced by broad grain size distributions, characteristic of natural debris flows, did the distributions of simulated impact forces have a similar form to those measured beneath the natural flows. These results highlight the important role flow grain size can have on basal impact force.

As either bed inclination or flow depth was increased in the simulated flows, the mean and the spread of the impact force and impact energy distribution increased as well and in a nonlinear fashion. Bed impact flux was largely decoupled from the downstream flux of particles and was a linearly decreasing function of slope once slope increased beyond a threshold value. Incision rate, which should scale as the product of impact energy and impact flux, increased as a nonlinear function of slope. Steep landscapes in which millennial scale erosion rates have been quantified display a similar nonlinear relationship between erosion rate and channel gradient. This suggests that the grain-scale mechanics quantified here could place strong controls on steepland morphology that evolves over thousands to millions of years.

==Time-line==


This project was part of my Ph.D., which is now finished. But new question keep emerging so the project is ongoing.

==Models in use==
 A modified version of the open source discrete element code called LIGGGHTS. http://cfdem.dcs-computing.com/?q=OpenSourceDEM

==Users==

Scott McCoy
Greg Tucker

==Funding==


This research was supported by the National Science Foundation (NSF) Graduate Fellowship, and NSF grants EAR 0643240 and EAR 0952247.

==Publications and presentations==


McCoy, S. W. (2012), Controls on Erosion and Transport of Mass by Debris Flows, PhD dissertation, University of Colorado.

McCoy, S.W., G.E. Tucker, J. W. Kean, J. A. Coe (2012), Granular Mechanics of Debris-Flow Incision: Measuring and Modeling Grain-Scale Impact Forces, Abstract EP41C-0810, 2012 Fall Meeting, AGU, San Francisco.

McCoy, S. W., G. E. Tucker, A. C. Whittaker, S. T. Lancaster, G. P. Roberts, and P. A. Cowie (2010), Debris flows and landscape evolution: Insight from topographic analysis, millennial erosion rates and grain-scale flow mechanics, in Geophysical Research Abstracts, vol. 12, pp. EGU2010–7399–1.



[[Category:Research project]]

HPCCprojects:Investigating controls on bedrock erosion by granular flows using an open source discrete element model

2013-05-31T16:16:36Z

Smccoy:

==Project description==


Although steep valleys are ubiquitous in mountainous terrain and there is evidence that episodic scour by debris flows is an important erosional process in these valleys, there is no agreed upon mechanical framework to describe debris flow incision into bedrock. Hence our goal is formulate a defensible stochastic debris flow incision rule.

We hypothesize that the rate of bedrock incision will scale with the product of the intensity at which flow particles impact the bedrock channel floor (measured as impact force or energy) and the impact flux. We use grain-scale numerical experiments (discrete element method simulations) of free-surface, gravity-driven granular flows to quantify how impact intensity and impact flux, and hence the rate at which debris flows incise bedrock, change as a function of field measureable channel and flow properties such as grain size, flow depth, and channel slope.

[[:Image:]]

Probability density of basal normal force from simulated monodispersed flows decayed rapidly and in an exponential manner with increasing force magnitude. Only when monodispersed flows were replaced by broad grain size distributions, characteristic of natural debris flows, did the distributions of simulated impact forces have a similar form to those measured beneath the natural flows. These results highlight the important role flow grain size can have on basal impact force.

As either bed inclination or flow depth was increased in the simulated flows, the mean and the spread of the impact force and impact energy distribution increased as well and in a nonlinear fashion. Bed impact flux was largely decoupled from the downstream flux of particles and was a linearly decreasing function of slope once slope increased beyond a threshold value. Incision rate, which should scale as the product of impact energy and impact flux, increased as a nonlinear function of slope. Steep landscapes in which millennial scale erosion rates have been quantified display a similar nonlinear relationship between erosion rate and channel gradient. This suggests that the grain-scale mechanics quantified here could place strong controls on steepland morphology that evolves over thousands to millions of years.

==Time-line==


This project was part of my Ph.D., which is now finished. But new question keep emerging so the project is ongoing.

==Models in use==
 A modified version of the open source discrete element code called LIGGGHTS. http://cfdem.dcs-computing.com/?q=OpenSourceDEM

==Users==

Scott McCoy
Greg Tucker

==Funding==

This research was supported by the National Science Foundation (NSF) Graduate Fellowship, and NSF grants EAR 0643240 and EAR 0952247.

==Publications and presentations==


McCoy, S. W. (2012), Controls on Erosion and Transport of Mass by Debris Flows, PhD dissertation, University of Colorado.

McCoy, S.W., G.E. Tucker, J. W. Kean, J. A. Coe (2012), Granular Mechanics of Debris-Flow Incision: Measuring and Modeling Grain-Scale Impact Forces, Abstract EP41C-0810, 2012 Fall Meeting, AGU, San Francisco.

McCoy, S. W., G. E. Tucker, A. C. Whittaker, S. T. Lancaster, G. P. Roberts, and P. A. Cowie (2010), Debris flows and landscape evolution: Insight from topographic analysis, millennial erosion rates and grain-scale flow mechanics, in Geophysical Research Abstracts, vol. 12, pp. EGU2010–7399–1.



[[Category:Research project]]

HPCCprojects:Investigating controls on bedrock erosion by granular flows using an open source discrete element model

2013-05-31T16:15:49Z

Smccoy:

==Project description==


Although steep valleys are ubiquitous in mountainous terrain and there is evidence that episodic scour by debris flows is an important erosional process in these valleys, there is no agreed upon mechanical framework to describe debris flow incision into bedrock. Hence our goal is formulate a defensible stochastic debris flow incision rule.

We hypothesize that the rate of bedrock incision will scale with the product of the intensity at which flow particles impact the bedrock channel floor (measured as impact force or energy) and the impact flux. We use grain-scale numerical experiments (discrete element method simulations) of free-surface, gravity-driven granular flows to quantify how impact intensity and impact flux, and hence the rate at which debris flows incise bedrock, change as a function of field measureable channel and flow properties such as grain size, flow depth, and channel slope.

[[:Image:]]

Probability density of basal normal force from simulated monodispersed flows decayed rapidly and in an exponential manner with increasing force magnitude. Only when monodispersed flows were replaced by broad grain size distributions, characteristic of natural debris flows, did the distributions of simulated impact forces have a similar form to those measured beneath the natural flows. These results highlight the important role flow grain size can have on basal impact force.

As either bed inclination or flow depth was increased in the simulated flows, the mean and the spread of the impact force and impact energy distribution increased as well and in a nonlinear fashion. Bed impact flux was largely decoupled from the downstream flux of particles and was a linearly decreasing function of slope once slope increased beyond a threshold value. Incision rate, which should scale as the product of impact energy and impact flux, increased as a nonlinear function of slope. Steep landscapes in which millennial scale erosion rates have been quantified display a similar nonlinear relationship between erosion rate and channel gradient. This suggests that the grain-scale mechanics quantified here could place strong controls on steepland morphology that evolves over thousands to millions of years.

==Time-line==


This project was part of my Ph.D., which is now finished. But new question keep emerging so the project is ongoing.

==Models in use==
 A modified version of the open source discrete element code called LIGGGHTS. http://cfdem.dcs-computing.com/?q=OpenSourceDEM


==Users==

Scott McCoy
Greg Tucker


==Funding==

This research was supported by the National Science Foundation (NSF) Graduate Fellowship, and NSF grants EAR 0643240 and EAR 0952247.


==Publications and presentations==


McCoy, S. W. (2012), Controls on Erosion and Transport of Mass by Debris Flows, PhD dissertation, University of Colorado.

McCoy, S.W., G.E. Tucker, J. W. Kean, J. A. Coe (2012), Granular Mechanics of Debris-Flow Incision: Measuring and Modeling Grain-Scale Impact Forces, Abstract EP41C-0810, 2012 Fall Meeting, AGU, San Francisco.

McCoy, S. W., G. E. Tucker, A. C. Whittaker, S. T. Lancaster, G. P. Roberts, and P. A. Cowie (2010), Debris flows and landscape evolution: Insight from topographic analysis, millennial erosion rates and grain-scale flow mechanics, in Geophysical Research Abstracts, vol. 12, pp. EGU2010–7399–1.



[[Category:Research project]]

HPCCprojects:Investigating controls on bedrock erosion by granular flows using an open source discrete element model

2013-05-31T16:14:34Z

Smccoy:

==Project description==


Although steep valleys are ubiquitous in mountainous terrain and there is evidence that episodic scour by debris flows is an important erosional process in these valleys, there is no agreed upon mechanical framework to describe debris flow incision into bedrock. Hence our goal is formulate a defensible stochastic debris flow incision rule.

We hypothesize that the rate of bedrock incision will scale with the product of the intensity at which flow particles impact the bedrock channel floor (measured as impact force or energy) and the impact flux. We use grain-scale numerical experiments (discrete element method simulations) of free-surface, gravity-driven granular flows to quantify how impact intensity and impact flux, and hence the rate at which debris flows incise bedrock, change as a function of field measureable channel and flow properties such as grain size, flow depth, and channel slope.

[[:Image:]]

Probability density of basal normal force from simulated monodispersed flows decayed rapidly and in an exponential manner with increasing force magnitude. Only when monodispersed flows were replaced by broad grain size distributions, characteristic of natural debris flows, did the distributions of simulated impact forces have a similar form to those measured beneath the natural flows. These results highlight the important role flow grain size can have on basal impact force.

As either bed inclination or flow depth was increased in the simulated flows, the mean and the spread of the impact force and impact energy distribution increased as well and in a nonlinear fashion. Bed impact flux was largely decoupled from the downstream flux of particles and was a linearly decreasing function of slope once slope increased beyond a threshold value. Incision rate, which should scale as the product of impact energy and impact flux, increased as a nonlinear function of slope. Steep landscapes in which millennial scale erosion rates have been quantified display a similar nonlinear relationship between erosion rate and channel gradient. This suggests that the grain-scale mechanics quantified here could place strong controls on steepland morphology that evolves over thousands to millions of years.

==Time-line==

This project was part of my Ph.D., which is now finished. But new question keep emerging so the project is ongoing.


==Models in use==
 A modified version of the open source discrete element code called LIGGGHTS. http://cfdem.dcs-computing.com/?q=OpenSourceDEM


==Users==

Scott McCoy
Greg Tucker


==Funding==

This research was supported by the National Science Foundation (NSF) Graduate Fellowship, and NSF grants EAR 0643240 and EAR 0952247.


==Publications and presentations==


McCoy, S. W. (2012), Controls on Erosion and Transport of Mass by Debris Flows, PhD dissertation, University of Colorado.

McCoy, S.W., G.E. Tucker, J. W. Kean, J. A. Coe (2012), Granular Mechanics of Debris-Flow Incision: Measuring and Modeling Grain-Scale Impact Forces, Abstract EP41C-0810, 2012 Fall Meeting, AGU, San Francisco.

McCoy, S. W., G. E. Tucker, A. C. Whittaker, S. T. Lancaster, G. P. Roberts, and P. A. Cowie (2010), Debris flows and landscape evolution: Insight from topographic analysis, millennial erosion rates and grain-scale flow mechanics, in Geophysical Research Abstracts, vol. 12, pp. EGU2010–7399–1.



[[Category:Research project]]

HPCCprojects:Investigating controls on bedrock erosion by granular flows using an open source discrete element model

2013-05-30T07:25:03Z

Smccoy: Created page with "<!-- How to create a new "HPCCproject" page: 1) Log in to the wiki 2) Create a new page for each HPCCproject, by using the following URL: * http://csdms.colorado.edu/wiki/H..."

__NOTOC__
={{PAGENAME}}=
==Project description==
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==Objectives==
List the main objectives of your project

==Time-line==
Provide (estimated) start date & end date, etc

==Models in use==
 A modified version of the open source discrete element code called LIGGGHTS. http://cfdem.dcs-computing.com/?q=OpenSourceDEM


==Results==
List the results of your project

==Users==
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==Funding==
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==Publications and presentations==
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==Links==
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Choose one of the two categories mentioned below, that your project suites the best
[[Category:Lecture project]] [[Category:Research project]]

User:Smccoy

2009-11-13T19:12:11Z

Smccoy:

{{Signup information member
|First name member=Scott
|Last name member=McCoy
|Institute member=University of Colorado
|Department member=Geological Sciences
|Postal address 1 member=UCB 399, 2200 Colorado Ave.
|City member=Boulder
|Postal code member=80309
|State member=Colorado
|Country member=USA
|Confirm email member=scott.mccoy@colorado.edu
|Work phone member=307-699-2375
|Fax member=307-699-2375
|Working group member=Terrestrial Working Group
}}