Model:LEMming: Difference between revisions
From CSDMS
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|Phone=303 7462330 | |Phone=303 7462330 | ||
|Fax=303 7462330 | |Fax=303 7462330 | ||
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{{Model identity | {{Model identity | ||
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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. | ||
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{{Start model keyword table | {{Start model keyword table | ||
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{{Model keywords | {{Model keywords | ||
|Model keywords=landscape evolution | |Model keywords=landscape evolution | ||
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{{Model keywords | {{Model keywords | ||
|Model keywords=rock type | |Model keywords=rock type | ||
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{{End a table | {{End a table | ||
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{{Model technical information | {{Model technical information | ||
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|Memory requirements=Low to moderate | |Memory requirements=Low to moderate | ||
|Typical run time=Minutes to days | |Typical run time=Minutes to days | ||
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{{Input - Output description | {{Input - Output description | ||
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|Post-processing software needed?=No | |Post-processing software needed?=No | ||
|Visualization software needed?=No | |Visualization software needed?=No | ||
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{{Process description model | {{Process description model | ||
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{{Model testing | {{Model testing | ||
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{{Users groups model | {{Users groups model | ||
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{{Documentation model | {{Documentation model | ||
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*'''Ward, D. J., Berlin, M. M., Anderson, R. S., 2011. Sediment dynamics below retreating cliffs. Earth Surface Processes and Landforms.''' | *'''Ward, D. J., Berlin, M. M., Anderson, R. S., 2011. Sediment dynamics below retreating cliffs. Earth Surface Processes and Landforms.''' | ||
|Manual model available=No | |Manual model available=No | ||
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{{Additional comments model | {{Additional comments model | ||
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{{CSDMS staff part | {{CSDMS staff part | ||
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|IRF interface=No but possible | |IRF interface=No but possible | ||
|CMT component=Not yet | |CMT component=Not yet | ||
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{{Start coupled table | {{Start coupled table | ||
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{{End a table | {{End a table | ||
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{{End headertab | {{End headertab | ||
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