Model:GrainHill

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GrainHill

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Summary Contact Technical specs In/Output Process Testing Other Component info Also known as Grain Hill Model type Single Model part of larger framework LandLab Note on status model Date note status model 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. The GrainHill model includes the GrainFacetSimulator, which represents an evolving normal-fault facet with a 60-degree-dipping fault. Keywords: Name Gregory 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 gtucker@colorado.edu Phone Fax 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, Through CSDMS repository Source web address https://github.com/gregtucker/grain_hills Source csdms web address https://github.com/csdms-contrib/GrainHill 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 model_type: 'grainhill', 'block', or 'facet' (default 'grainhill') number_of_node_rows: # rows number_of_node_columns: # columns cell_width: width of grid cells, m grav_accel: gravitational acceleration, m/s2 friction_coef: dimensionless friction factor, 0 to 1 run_duration: duration of run, years uplift_interval: time interval between uplift events, years dissolution_rate: (facet only) rate coefficient for dissolution, 1/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) block_layer_dip_angle: ('block' only) dip angle for layer made of blocks block_layer_thickness: ('block' only) thickness, in cells, of layer layer_left_x: ('block' only) x coordinate of left edge of layer y0_top: ('block' only) if block option selected, y coordinate of top of layer at x=0 fault_x: ('facet' only) x location of fault trace at y=0, m baselevel_rise_interval: ('facet' only) rate of left-side baselevel rise, m/yr opt_rock_collapse: option to have rock cells collapse when undermined save_plots: whether to save any plots to file (True or False) plot_filename: base name for plot files, if used plot_filetype: filename extension for plots (default '.png') plot_interval: interval between plots, years output_interval: interval between file output, years report_interval: real-time interval for reporting on screen, seconds 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 papers) 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; rock dissolution; baselevel lowering; fault slip Describe key physical parameters and equations (see papers) Describe length scale and resolution constraints (see papers) Describe time scale and resolution constraints (see papers) Describe any numerical limitations and issues (see papers) 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 https://github.com/gregtucker/grain_hills Model forum / discussion board Comments This part will be filled out by CSDMS staff OpenMI compliant No but possible BMI compliant No but possible WMT component No but possible PyMT component Is this a data component DOI model 10.5281/zenodo.1306961 For model version 1.0 Year version submitted 2018 Link to file https://zenodo.org/record/1306961 Can be coupled with:

Model info Authors Gregory Tucker Source code DOI Download GrainHill version: 1.0 Doi: 10.5281/zenodo.1306961 Model citations Nr. of publications: 1 Total citations: 8 h-index: 1 m-quotient: 0.12 QR-code Link to this page Other models by author GrainHill

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Nr. of publications:	1
Total citations:	8
h-index:	1
m-quotient:	0.12

Featured publication(s)	Year	Model described	Type of Reference	Citations
Tucker, Gregory E.; McCoy, Scott W.; Hobley, Daniel E. J.; 2018. A lattice grain model of hillslope evolution. Earth Surface Dynamics, 6, 563–582. 10.5194/esurf-6-563-2018 (View/edit entry)	2018	GrainHill Landlab	Model overview	8
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