Model:LEMming: Difference between revisions
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|One-line model description=LEMming landscape evolution model: a 2-D, regular-grid, rules-based, hybrid finite-difference / cellular automaton model that is designed to explore the effect of multiple rock types on landscape evolution. | |One-line model description=LEMming landscape evolution model: a 2-D, regular-grid, rules-based, hybrid finite-difference / cellular automaton model that is designed to explore the effect of multiple rock types on landscape evolution. | ||
|Extended model description=LEMming tracks regolith and sediment fluxes, including bedrock erosion by streams and rockfall from steep slopes. Initial landscape form and stratigraphic structure are prescribed. Model grid cells with slope angles above a threshold, and which correspond to the appropriate rock type, are designated as candidate sources for rockfall. Rockfall erosion of the cliffband is simulated by instantaneously reducing the height of a randomly chosen grid cell that is susceptible to failure to that of its nearest downhill neighbor among the eight cells bordering it. This volume of rockfall debris is distributed across the landscape below this cell according to rules that weight the likelihood of each downhill cell to retain rockfall debris. The weighting is based on local conditions such as slope angle, topographic curvature, and distance and direction from the rockfall source. Rockfall debris and the bedrock types are each differentiated by the rate at which they weather to regolith and by their fluvial erodibility. Regolith is moved according to transport rules mimicking hillslope processes (dependent on local slope angle), and bedload and suspended load transport (based on stream power). Regolith and sediment transport are limited by available material; bedrock incision occurs (also based on stream power) where bare rock is exposed. | |Extended model description=LEMming tracks regolith and sediment fluxes, including bedrock erosion by streams and rockfall from steep slopes. Initial landscape form and stratigraphic structure are prescribed. Model grid cells with slope angles above a threshold, and which correspond to the appropriate rock type, are designated as candidate sources for rockfall. Rockfall erosion of the cliffband is simulated by instantaneously reducing the height of a randomly chosen grid cell that is susceptible to failure to that of its nearest downhill neighbor among the eight cells bordering it. This volume of rockfall debris is distributed across the landscape below this cell according to rules that weight the likelihood of each downhill cell to retain rockfall debris. The weighting is based on local conditions such as slope angle, topographic curvature, and distance and direction from the rockfall source. Rockfall debris and the bedrock types are each differentiated by the rate at which they weather to regolith and by their fluvial erodibility. Regolith is moved according to transport rules mimicking hillslope processes (dependent on local slope angle), and bedload and suspended load transport (based on stream power). Regolith and sediment transport are limited by available material; bedrock incision occurs (also based on stream power) where bare rock is exposed. | ||
|maxlength=1000=Ward, D. J., Berlin, M. M., and Anderson, R. S. (2011). Sediment dynamics below retreating cliffs. Earth Surface Processes and Landforms. In press. DOI: 10.1002/esp.2129. | |||
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{{Model keywords | |||
|Model keywords=landscape evolution | |||
|maxlength=1000=Ward, D. J., Berlin, M. M., and Anderson, R. S. (2011). Sediment dynamics below retreating cliffs. Earth Surface Processes and Landforms. In press. DOI: 10.1002/esp.2129. | |||
}} | |||
{{Model keywords | |||
|Model keywords=rock type | |||
|maxlength=1000=Ward, D. J., Berlin, M. M., and Anderson, R. S. (2011). Sediment dynamics below retreating cliffs. Earth Surface Processes and Landforms. In press. DOI: 10.1002/esp.2129. | |maxlength=1000=Ward, D. J., Berlin, M. M., and Anderson, R. S. (2011). Sediment dynamics below retreating cliffs. Earth Surface Processes and Landforms. In press. DOI: 10.1002/esp.2129. | ||
}} | }} |
Revision as of 11:03, 2 June 2011
Contact
Name | Dylan Ward |
Type of contact | Model developer |
Institute / Organization | University of New Mexico |
Postal address 1 | Department of Earth and Planetary Sciences |
Postal address 2 | Northrop Hall |
Town / City | Albuquerque |
Postal code | 87131 |
State | New Mexico |
Country | United States |
Email address | djward@unm.edu |
Phone | 303 7462330 |
Fax | 303 7462330 |
LEMming
Metadata
Summary
landscape evolution, rock type, Technical specs
In/Output
Process
Testing
Other
Download statistics<pbars ytitle=Downloads Title='Monthly Downloads lemming' xlabels=true size=900x200 ymax=10 grid=true box=true cubic=true plots=open xformat=number connected=true angle=90 legend> ,Total downloads: 18 2008 - Jan,0 Feb,0 Mar,0 Apr,0 May,0 Jun,0 Jul,0 Aug,0 Sep,0 Oct,0 Nov,0 Dec,0 2009 - Jan,0 Feb,0 Mar,0 Apr,0 May,0 Jun,0 Jul,0 Aug,0 Sep,0 Oct,0 Nov,0 Dec,0 2010 - Jan,0 Feb,0 Mar,0 Apr,0 May,0 Jun,0 Jul,0 Aug,0 Sep,0 Oct,0 Nov,0 Dec,0 2011 - Jan,0 Feb,2 Mar,0 Apr,0 May,0 Jun,0 Jul,0 Aug,0 Sep,1 Oct,0 Nov,0 Dec,0 2012 - Jan,0 Feb,0 Mar,0 Apr,0 May,3 Jun,0 Jul,1 Aug,0 Sep,0 Oct,0 Nov,3 Dec,1 2013 - Jan,0 Feb,0 Mar,0 Apr,0 May,1 Jun,0 Jul,0 Aug,1 Sep,1 Oct,0 Nov,0 Dec,0 2014 - Jan,0 Feb,1 Mar,0 Apr,0 May,0 Jun,0 Jul,0 Aug,0 Sep,2 Oct,1 Nov,0 Dec,0 2015 - Jan,0 Feb,0 Mar,0 Apr,0 May,0 Jun,0 Jul,0 </pbars> IntroductionHistoryPapersWard, D. J., Berlin, M. M., and Anderson, R. S. (2011). Sediment dynamics below retreating cliffs. Earth Surface Processes and Landforms. In press. DOI: 10.1002/esp.2129. IssuesHelpInput FilesOutput FilesDownload source code |