Model:MARSSIM: Difference between revisions

Revision as of 16:57, 12 June 2009

MARSSIM

Introduction

History

Papers

MARSSIM Questionnaire

Contact Information

Model:	MARSSIM
Contact person:	Alan Howard
Institute:	University of Virginia
City:	Charlottesville, Virginia
Country:	USA
Email:	ah6p@virginia.edu
2nd person involved:	--
3rd person involved:	--

Model description

Model type:	Modular for the terrestrial and coastal domain.
Description:	A landform evolution model operating at the drainage basin or larger scale. Recent model development has targeted planetary applications.

Technical information

Supported platforms:	Linux, windows
Programming language:	Fortran90
Model was developed started from:	1990 and development still takes place
To what degree will the model become available:	Source code will be available. Model can also be used as teaching tool and executable will become available as well.
Current license type:	None
Memory requirements:	Variable - dynamic arrays
Typical run time:	hours to days

Input / Output description

Input parameters:	Initial elevation file. File specifying boundary conditions, run time, process options, and parameter values.
Input format:	ASCII
Output parameters:	RAW image files of elevation and shaded relief. ASCII file of elevations at specified times. ASCII files of other state variables as desired at specified times. Iteration-by-iteration summary file
Output format:	ASCII
Post-processing software (if needed):	yes, Photoshop to produce movies. Conversions to a variety of data formats.
Visualization software (if needed):	yes, Surfer for topographic maps

Process description

Processes represented by model:	Bedrock fluvial incision (shear stress or sediment flux dependency). Mass wasting (creep and threshold-limited). Bedload sediment transport & deposition in streams, fans, deltas. Impact cratering, aeolian deposition, lava flows. Flow routing with evaporation from depressions.
Key physical parameters & equations:	Bedrock erodibility, mass wasting diffusivity, bed material grain size, flow hydrologic parameters, relative evaporation rate, cratering size distribution and rate, eolian deposition parameters, etc.
Length scale & resolution constraints:	Variable - targeted towards drainage basin or larger scales. Spatial scale determined by input parameter and run-time specification of array dimentions. Uses rectangular grid cells.
Time scale & resolution constraints:	Variable - Limited by computer speed.
Numerical limitations and issues :	Runs with grid sizes greater than about 600x600 may require many days on a PC. Model assumes fluvial streams have gradients determined by steady-state transport. Depositional stratigraphy not modeled.

Testing

Available calibration data sets:	None
Available test data sets:	Example runs for most types of simulation scenarios
Ideal data for testing:	None

User groups

Currently or plans for collaborating with:	Yes, at present primarily in the planetary community.

Documentation

Key papers of the model:	Howard, A.D., 1994, A detachment-limited model of drainage basin evolution, Water Resources Research, 30(7) 2261-85. Howard, A.D., 2007, Simulating the development of martian highland landscapes..., Geomorphology, 91, 332-363.
Is there a manual available:	See the marssim_program.pdf file for a brief tutorial
Model website if any:	http://erode.evsc.virginia.edu

Additional comments

Comments:	Most recent model available from ah6p@virginia.edu.

Issues

Help

Documentation that describes MARSSIM subroutines and functions, input and output files, and literature references can be found here: marssim_program.pdf

Accessory MARSSIM programs can be downloaded here: accessory_programs.zip

Example simulations are for a variety of scenarios are generated and can be downloaded below:

Accretion
Arid_slope
Bedrock: (download these 2 files and place Resist.in in the bedrock folder)

Source

Source Code MARSSIM

@@ Line 187: / Line 187: @@
 *[[media:Accretion.zip|Accretion]]
 *[[media:Arid_slope.zip|Arid_slope]]
-*[[media:Bedrock.zip|Bedrock]]
+*Bedrock: (''download these 2 files and place Resist.in in the bedrock folder'')
+::#[[media:Bedrock.zip|Bedrock]]
+::#[[Resist.in.zip|Resist.in]]
 *[[media:Callisto.zip|Callisto]]
 *[[media:Coastal.zip|Coastal]]