Model help:MARSSIM: Difference between revisions
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= Mass wasting = | |||
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!Parameter!!Description!!Unit | |||
|-valign="top" | |||
|width="20%"| Switch for slope erosion modelling | |||
|width="60%"| If set to 1, use slope erosion modelling (ISLOPEUSE, 0 or 1) | |||
|width="20%"| - | |||
|- | |||
| Slope diffusity | |||
| Determines relative rate of downslope creep (m<sub>2</sub>/yr) try values between 0.0002 and 0.02 | |||
| - | |||
|- | |||
| Proportion of slope constant in alluvial creep | |||
| Relative diffusivity of alluvium mass wasting to slope mass wasting. Generally set to 1 | |||
| - | |||
|- | |||
| Switch to use critical slope gradient | |||
| If use to 1, use a critical slope gradient (Critical_gradient_use, 0 or 1) | |||
| - | |||
|- | |||
| Switch to use Roering mass wasting | |||
| If set to 1, use the Roering formula for mass wasting. Otherwise, use the Howard formula. The Roering formula allows a threshold maximum slope gradient in regolith. The Howard formula uses linear creep | |||
| - | |||
|- | |||
| Critical slope gradient | |||
| Maximum stable regolith gradient | |||
| - | |||
|- | |||
| Slope gradient exponent | |||
| Used for Howard two-term relationship | |||
| - | |||
|- | |||
|} | |||
= Bistable Erosion = | |||
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|- | |||
!Parameter!!Description!!Unit | |||
|-valign="top" | |||
|width="20%"| Switch to use bistable fluvial erosion | |||
|width="60%"| If set to 1, use bistable fluvial erosion (HIGHRATEUSE, 0 or 1) used for modelling gully development | |||
|width="20%"| - | |||
|- | |||
| Switch to use bistable bedrock | |||
| If set to 1, use bistable bedrock (BEDROCKHIGH, 0 or 1) used for modeling gully development | |||
| - | |||
|- | |||
| Low erosion threshold | |||
| Only used with bistable erosion and gully development | |||
| - | |||
|- | |||
| High erosion threshold | |||
| Only used with bistable erosion and gully development | |||
| - | |||
|- | |||
| Erosion rate change lag | |||
| Only used with bistable erosion and gully development | |||
| - | |||
|- | |||
| Bistable critical shear | |||
| Only used with bistable erosion and gully development | |||
| - | |||
|- | |||
| Bistable runoff factor | |||
| Only used with bistable erosion and gully development | |||
| - | |||
|- | |||
| Bistable bedrock erodibility | |||
| Only used with bistable erosion and gully development | |||
| - | |||
|- | |||
|} | |||
= Random variation (Sim. param) = | |||
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|- | |||
!Parameter!!Description!!Unit | |||
|-valign="top" | |||
|width="20%"| Switch to use random critical shear stress | |||
|width="60%"| If set to 1, use random critical shear stress (RANDTHRESHUSE, 0 or 1) | |||
|width="20%"| - | |||
|- | |||
| Switch to use random discharge | |||
| If set to 1, use random discharge (RANDDISCHUSE, 0 or 1) | |||
| - | |||
|- | |||
| Critical shear variablity | |||
| Scale factor for random critical shear stress | |||
| - | |||
|- | |||
| Discharge coeff variation | |||
| Standard error of discharge, assuming a lognormal distribution | |||
| - | |||
|- | |||
| Omega weight | |||
| Governs inherientance from past value, similar to Hurst parameter set to 1 for no inheritance | |||
| - | |||
|- | |||
|} | |||
= 3D Spatially varying Bedrock Res = | |||
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|- | |||
!Parameter!!Description!!Unit | |||
|-valign="top" | |||
|width="20%"| Switch to use 3D variable resistance weathering | |||
|width="60%"| If set to 1, use 3D variable resistance weathering (SLOPEVARUSE, 0 or 1) | |||
|width="20%"| - | |||
|- | |||
| Diffusivity variability | |||
| - | |||
| - | |||
|- | |||
| Switch to use a resistant surface layer | |||
| If set to 1, use a resistant surface layer (CRUSTUSE, 0 or 1). Experimental, for simulating the effect of development of a "duricrust" | |||
| - | |||
|- | |||
| Surface layer thickness | |||
| Crust thickness, using the same units as cell size | |||
| - | |||
|- | |||
| Surface layer resistance | |||
| Crust relative shear stress factor, greater than 1 for a resistant crust | |||
| - | |||
|- | |||
| Vertical resistance scale factor | |||
| Ratio of horizontal to vertical scale's (1.0 if equal). Only used for 3D varing rock resistance | |||
| - | |||
|- | |||
|} | |||
= Etc. tab header = | = Etc. tab header = |
Revision as of 18:44, 28 July 2011
MARSSIM
The MARSSIM model is a landform evolution model primarily focuses on relatively long temporal scales (relative to the timescale for noticeable landform change) through fluvial and mass wasting processes.
Model introduction
The program is designed be computationally efficient such that individual runs can be done on a modern microcomputer in no more than a few tens of hours. The more recent additions to the model have focused on processes relevant to planetary landscapes, including lava flows, groundwater seepage and sapping, impact cratering, surface-normal accretion and ablation, and volatile redistribution by radiation-induced sublimation and recondensation. Individual process formulations vary from completely heuristic to modestly mechanistic. Important limitations for some potential applications are the assumption of a single representative bed material grain size in the fluvial system and no tracking of internal stratigraphy of sedimentary deposits.
Model parameters
Uses ports
This will be something that the CSDMS facility will add
Provides ports
This will be something that the CSDMS facility will add
Main equations
A list of the key equations. HTML format is supported; latex format will be supported in the future
Notes
Any notes, comments, you want to share with the user
Numerical scheme
Examples
An example run with input parameters, BLD files, as well as a figure / movie of the output
Follow the next steps to include images / movies of simulations:
- Upload file: http://csdms.colorado.edu/wiki/Special:Upload
- Create link to the file on your page: [[Image:<file name>]].
See also: Help:Images or Help:Movies
Developer(s)
Name of the module developer(s)
References
Key papers
Links
Any link, eg. to the model questionnaire, etc.