Contact

Name	Greg Tucker
Type of contact	Model developer
Institute / Organization	University of Colorado
Postal address 1	CIRES & Dept. Geological Sciences
Postal address 2	Campus Box 399
Town / City	Boulder
Postal code	80309-0399
State	Colorado
Country	USA"USA" is not in the list (Afghanistan, Albania, Algeria, Andorra, Angola, Antigua and Barbuda, Argentina, Armenia, Australia, Austria, ...) of allowed values for the "Country" property.
Email address	Gregory.Tucker@colorado.edu
Phone	+1 303 492 6985
Fax	+1 303 492 2606

GOLEM

Also known as
Model type	Single
Model part of larger framework
Note on status model
Date note status model

Supported platforms	Unix, Linux, Mac OS
Other platform
Programming language	C
Other program language
Code optimized	Single Processor
Multiple processors implemented
Nr of distributed processors
Nr of shared processors
Start year development	1991
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 owner"Through owner" is not in the list (Through web repository, Through CSDMS repository) of allowed values for the "Source code availability" property.
Source web address
Source csdms web address
Program license type	GPL v2
Program license type other
Memory requirements	Variable
Typical run time	minutes to days

Describe input parameters	Standard input parameter files (ascii). For some conditions, also require additional binary file specifying boundary configuration.
Input format	ASCII, Binary
Other input format
Describe output parameters	Elevation, drainage area, and related gridded information.
Output format	ASCII
Other output format
Pre-processing software needed?	No
Describe pre-processing software
Post-processing software needed?	No
Describe post-processing software
Visualization software needed?	Yes
If above answer is yes	IDL, Matlab
Other visualization software	some visualization scripts for IDL and Matlab available.

Describe processes represented by the model	Runoff, hillslope and channel sediment transport.
Describe key physical parameters and equations	Key state variables include surface elevation, soil thickness, and discharge.
Describe length scale and resolution constraints	Has been used on scales from small (few km2) watersheds to sub-continental areas.
Describe time scale and resolution constraints	Designed for time scales over which topography changes appreciably, which might be years for badlands, up to thousands or millions of years for other landscapes.
Describe any numerical limitations and issues	Equation set is still and uses robust but relatively inefficient solvers. Recommend testing with coarse grid resolutions (say, 20x20 cells) before attempting larger/finer grids.

Describe available calibration data sets	Few or none, unfortunately
Upload calibration data sets if available:
Describe available test data sets	--
Upload test data sets if available:
Describe ideal data for testing	See paper on geomorphic natural experiments by Tucker (in review, 2008)

Do you have current or future plans for collaborating with other researchers?	--

Is there a manual available?	Yes
Upload manual if available:
Model website if any	http://www.colorado.edu/geolsci/gtucker/Software/Golem/GolemMain.html
Model forum / discussion board

Comments	GOLEM was written in the 1990s by one of the creators of CHILD. Although it lacks many of the special capabilities of CHILD, it has a simpler, more compact code base (just a single C source file) and uses a raster grid data structure.