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 Terrestrial
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.

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
Phone 303 7462330
Fax 303 7462330

Supported platforms
Linux, Mac OS, Windows
Other platform
Programming language


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

This part will be filled out by CSDMS staff

OpenMI compliant No but possible
BMI compliant No but possible
WMT component No but possible
PyMT component
Is this a data component
DOI model 10.1594/IEDA/100141
For model version 0.1.5
Year version submitted 2011
Link to file
Can be coupled with:
Model info

Nr. of publications: 2
Total citations: 24
h-index: 1
m-quotient: 0.08
Qrcode LEMming.png
Link to this page




Nr. of publications: 2
Total citations: 24
h-index: 1
m-quotient: 0.08

Featured publication(s)YearModel describedType of ReferenceCitations
Ward, D. J.; Berlin, M. M.; Anderson, R. S.; 2011. Sediment dynamics below retreating cliffs: SEDIMENT DYNAMICS BELOW RETREATING CLIFFS. Earth Surface Processes and Landforms, 36, 1023–1043. 10.1002/esp.2129
(View/edit entry)
2011 LEMming
Model overview 24
Ward, D.J.; 2011. LEMming, version 0.1.5.. , , 10.1594/IEDA/100141
(View/edit entry)
2011 LEMming

Source code ref.

See more publications of LEMming



Input Files

Output Files