Model:LEMming

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LEMming

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Summary Contact Technical specs In/Output Process Testing Other Component info Also known as Model type Single Model part of larger framework Note on status model Date note status model Incorporated models or components: Spatial dimensions 2D Spatial extent Regional-Scale, Landscape-Scale, Watershed-Scale, Reach-Scale Model domain 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. Keywords: landscape evolution, rock type, 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 Supported platforms Linux, Mac OS, Windows Other platform Programming language Matlab Other program language Code optimized Single Processor Multiple processors implemented Nr of distributed processors Nr of shared processors Start year development 2008 Does model development still take place? Yes If above answer is no, provide end year model development Code development status When did you indicate the 'code development status'? Model availability As code Source code availability (Or provide future intension) Through CSDMS repository Source web address Source csdms web address Program license type GPL v2 Program license type other Memory requirements Low to moderate Typical run time Minutes to days Describe input parameters Input format ASCII Other input format Describe output parameters Output format Binary Other output format Pre-processing software needed? No Describe pre-processing software Post-processing software needed? No Describe post-processing software Visualization software needed? No If above answer is yes Other visualization software Describe processes represented by the model Describe key physical parameters and equations Describe length scale and resolution constraints Describe time scale and resolution constraints Describe any numerical limitations and issues Describe available calibration data sets Upload calibration data sets if available: Describe available test data sets Upload test data sets if available: Describe ideal data for testing Do you have current or future plans for collaborating with other researchers? Is there a manual available? No Upload manual if available: Model website if any Model forum / discussion board Comments This part will be filled out by CSDMS staff OpenMI compliant No not possible BMI compliant No but possible WMT component Not yet"Not yet" is not in the list (Yes, In progress, No but possible, No not possible) of allowed values for the "Code CMT compliant or not" property. PyMT component Is this a data component DOI model 10.1594/IEDA/100141 For model version 0.1.5 Year version submitted Link to file Can be coupled with:

Model info Authors Dylan Ward Source code View in CSDMS GitHub repository DOI Download LEMming version: 0.1.5 Doi: 10.1594/IEDA/100141 Model citations Nr. of publications: 2 Total citations: 31 h-index: 1 m-quotient: 0.07 QR-code Link to this page Other models by author LEMming LEMming2

Download statistics

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Papers

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.