Model:MARSSIM

Contact

Name	Alan Howard
Type of contact	Model developer
Institute / Organization	University of Virginia
Postal address 1	P.O. Box 400123
Postal address 2
Town / City	Charlottesville
Postal code	22904-4123
State	Virginia
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	ah6p@virginia.edu
Phone	434-924-0566
Fax	434-982-2137

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MARSSIM

Metadata

Summary Also known as Model type Modular Model part of larger framework Note on status model Date note status model Technical specs Supported platforms Linux, Windows Other platform Programming language Fortran90 Other program language Code optimized Multiple processors implemented Nr of distributed processors Nr of shared processors Start year development 1990 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 Other Program license type other None Memory requirements Variable - dynamic arrays Typical run time hour to days In/Output Describe input parameters Initial elevation file. File specifying boundary conditions, run time, process options, and parameter values. Input format ASCII Other input format Describe 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 Other output format Pre-processing software needed? No Describe pre-processing software Post-processing software needed? Yes Describe post-processing software Photoshop to produce movies. Conversions to a variety of data formats. Visualization software needed? Yes If above answer is yes Other visualization software Surfer for topographic maps Process Describe processes represented by the 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. Describe key physical parameters and 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. Describe length scale and 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. Describe time scale and resolution constraints Variable - Limited by computer speed. Describe any 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 Describe available calibration data sets None Upload calibration data sets if available: Describe available test data sets Example runs for most types of simulation scenarios Upload test data sets if available: Describe ideal data for testing None Other Do you have current or future plans for collaborating with other researchers? Yes, at present primarily in the planetary community. Is there a manual available? Yes Upload manual if available: [[Model manual::Media:marssim_program.pdf| ]][[Media:marssim_program.pdf]] Model website if any http://erode.evsc.virginia.edu Model forum / discussion board Comments Most recent model available from ah6p@virginia.edu. 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 Input Files See: marssim_program.pdf Output Files See: marssim_program.pdf Download 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) Bedrock Resist.in Callisto Coastal Critical_shear_stress Deep_seepage Eolian Fluvial_no_cratering Fluvial_rapid_cratering Fluvial_slow_cratering Gully Large_crater Lava Moderate_cratering Non_linear_creep_enhanced Non_linear_creep_retarded Pediment Pelagic_sedimentation Resistant_bedrock Shallow_seepage Simple_steady_state slope_evap_steady_25 Small_crater Variable_evaporation Source Source Code MARSSIM