Model:LEMming2

LEMming2

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	Landscape-Scale
Model domain	Terrestrial
One-line model description	2D model that simulates the retreat of hard-capped cliffs
Extended model description	LEMming2 is a 2D, finite-difference landscape evolution model that simulates the retreat of hard-capped cliffs. It implements common unit-stream-power and linear/nonlinear-diffusion erosion equations on a 2D regular grid. Arbitrary stratigraphy may be defined. Cliff retreat is facilitated by a cellular algorithm, and rockfall debris is distributed and redistributed to the angle of repose. It is a standalone model written in Matlab with some C components. This repo contains the code used and described by Ward (2019) Lithosphere: "Dip, layer spacing, and incision rate controls on the formation of strike valleys, cuestas, and cliffbands in heterogeneous stratigraphy". Given the inputs in that paper it should generate the same results.

Keywords:

Supported platforms	Linux, Mac OS, Windows
Other platform
Programming language	C, Matlab
Other program language
Code optimized	Single Processor
Multiple processors implemented
Nr of distributed processors
Nr of shared processors
Start year development	2009
Does model development still take place?	Yes
If above answer is no, provide end year model development
Code development status	Active
When did you indicate the 'code development status'?	2020
Model availability	As code
Source code availability (Or provide future intension)	Through web repository
Source web address	https://github.com/ddoubleprime/LEMming2
Source csdms web address
Program license type	GPL v2
Program license type other
Memory requirements	Varies with grid size; 4+GB free recommended
Typical run time	Varies with grid size and length of run; minutes to days

Describe input parameters	Inputs include grid definitions, erosion rule parameters, uplift time series, stratigraphic geometry, and rock type and rockfall debris erodibility.
Input format	ASCII
Other input format	ASCII/Matlab input file acts as a namelist.
Describe output parameters	Outputs complete Matlab workspace at user-defined intervals. Outputs surface plots at user-defined intervals. Some scripts are included for additional visualization of output.
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

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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	https://github.com/ddoubleprime/LEMming2
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Other models by author

Featured publication(s)	Year	Model described	Type of Reference	Citations
Ward, Dylan J.; 2019. Dip, layer spacing, and incision rate controls on the formation of strike valleys, cuestas, and cliffbands in heterogeneous stratigraphy. Lithosphere, 11, 697–707. 10.1130/L1056.1 (View/edit entry)	2019	LEMming2	Model application	13
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