Revision as of 12:48, 3 July 2018 by Gtucker (talk | contribs)



Also known as Grain Hill
Model type Single
Model part of larger framework LandLab
Incorporated models or components:
Spatial dimensions 2D
Spatial extent Reach-Scale
Model domain Terrestrial
One-line model description Cellular automaton model of hillslope evolution
Extended model description The Grain Hill model provides a computational framework with which to study slope forms that arise from stochastic disturbance and rock weathering events. The model operates on a hexagonal lattice, with cell states representing fluid, rock, and grain aggregates that are either stationary or in a state of motion in one of the six cardinal lattice directions. Cells representing near-surface soil material undergo stochastic disturbance events, in which initially stationary material is put into motion. Net downslope transport emerges from the greater likelihood for disturbed material to move downhill than to move uphill. Cells representing rock undergo stochastic weathering events in which the rock is converted into regolith. The model can reproduce a range of common slope forms, from fully soil mantled to rocky or partially mantled, and from convex-upward to planar shapes. An optional additional state represents large blocks that cannot be displaced upward by disturbance events. With the addition of this state, the model captures the morphology of hogbacks, scarps, and similar features. In its simplest form, the model has only three process parameters, which represent disturbance frequency, characteristic disturbance depth, and baselevel lowering rate, respectively. Incorporating physical weathering of rock adds one additional parameter, representing the characteristic rock weathering rate. These parameters are not arbitrary but rather have a direct link with corresponding parameters in continuum theory.

First name Gregory
Last name Tucker
Type of contact Model developer
Institute / Organization University of Colorado
Postal address 1
Postal address 2
Town / City Boulder
Postal code 80309
State Colorado
Country United States
Email address

Supported platforms Unix, Linux, Mac OS, Windows
Other platform
Programming language Python
Other program language
Code optimized Single Processor
Multiple processors implemented
Nr of distributed processors
Nr of shared processors
Start year development 2014
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 web repository
Source web address
Source csdms web address
Program license type BSD or MIT X11
Program license type other
Memory requirements varies with grid size
Typical run time varies with grid size

Describe input parameters number_of_node_rows: # rows

number_of_node_columns: # columns cell_size: width of grid cells, grav_accel: gravitational acceleration, m/s2 friction_coef: dimensionless friction factor, 0 to 1 run_duration: duration of run, years output_name: base name for output files uplift_interval: time interval between uplift events, years disturbance_rate: frequency parameter for soil disturbance, 1/years weathering_rate: frequency parameter for rock weathering, 1/years rock_state_for_uplift: type of material added at base during uplift (7=soil, 8=rock) opt_rock_collapse: option to have rock cells collapse when undermined opt_track_grains: (currently under development) show_plots: whether to display plots on screen (True or False) plot_to_file: whether to write plots to png file (True or False) plot_interval: interval between plots, years output_interval: interval between file output, years report_interval: real-time interval for reporting on screen, seconds include_blocks: whether to include a layer of rock that weathers to blocks (True or False) block_layer_dip_angle: (optional) if block option selected, dip angle for rock layer block_layer_thickness: (optional) if block option selected, thickness of layer in cells y0_top: (optional) if block option selected, y coordinate of top of layer at x=0

Input format ASCII
Other input format
Describe output parameters node state grid written to netCDF file (each node gets a code from 0 to 8; see paper)
Output format
Other output format netCDF
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 Regolith disturbance; rock weathering; baselevel lowering
Describe key physical parameters and equations (see paper)
Describe length scale and resolution constraints (see paper)
Describe time scale and resolution constraints (see paper)
Describe any numerical limitations and issues (see paper)

Describe available calibration data sets
Upload calibration data sets if available:
Describe available test data sets
Upload test data sets if available:
Describe ideal data for testing

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
Model forum / discussion board

This part will be filled out by CSDMS staff

OpenMI compliant Not yet"Not yet" is not in the list (Yes, No but planned, No but possible, No not possible) of allowed values for the "Code openmi compliant or not" property.
BMI compliant Not yet"Not yet" is not in the list (Yes, No but planned, No but possible, No not possible) of allowed values for the "Code IRF or not" property.
WMT component Not yet"Not yet" is not in the list (Yes, In progress, No but possible, No not possible) of allowed values for the "Code CMT compliant or not" property.
PyMT component
Is this a data component
Can be coupled with:
Model info
Gregory Tucker

Nr. of publications: 1
Total citations: 5
h-index: 1
m-quotient: 0.25
Qrcode GrainHill.png
Link to this page




Nr. of publications: 1
Total citations: 5
h-index: 1
m-quotient: 0.25

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Model overview

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Related theory




Input Files

Output Files