Model:GrainHill: Difference between revisions
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|Spatialscale=Reach-Scale | |Spatialscale=Reach-Scale | ||
|One-line model description=Cellular automaton model of hillslope evolution | |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. | |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. | ||
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{{Start model keyword table}} | {{Start model keyword table}} | ||
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{{Input - Output description | {{Input - Output description | ||
|Describe input parameters=number_of_node_rows: # rows | |Describe input parameters=model_type: 'grainhill', 'block', or 'facet' (default 'grainhill') | ||
number_of_node_rows: # rows | |||
number_of_node_columns: # columns | number_of_node_columns: # columns | ||
cell_width: width of grid cells, m | |||
grav_accel: gravitational acceleration, m/s2 | grav_accel: gravitational acceleration, m/s2 | ||
friction_coef: dimensionless friction factor, 0 to 1 | friction_coef: dimensionless friction factor, 0 to 1 | ||
run_duration: duration of run, years | run_duration: duration of run, years | ||
uplift_interval: time interval between uplift events, 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 | disturbance_rate: frequency parameter for soil disturbance, 1/years | ||
weathering_rate: frequency parameter for rock weathering, 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) | 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 | 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 | plot_interval: interval between plots, years | ||
output_interval: interval between file output, years | output_interval: interval between file output, years | ||
report_interval: real-time interval for reporting on screen, seconds | report_interval: real-time interval for reporting on screen, seconds | ||
|Input format=ASCII | |Input format=ASCII | ||
|Describe output parameters=node state grid written to netCDF file (each node gets a code from 0 to 8; see | |Describe output parameters=node state grid written to netCDF file (each node gets a code from 0 to 8; see papers) | ||
|Other output format=netCDF | |Other output format=netCDF | ||
|Pre-processing software needed?=No | |Pre-processing software needed?=No | ||
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}} | }} | ||
{{Process description model | {{Process description model | ||
|Describe processes represented by the model=Regolith disturbance; rock weathering; baselevel lowering | |Describe processes represented by the model=Regolith disturbance; rock weathering; rock dissolution; baselevel lowering; fault slip | ||
|Describe key physical parameters and equations=(see | |Describe key physical parameters and equations=(see papers) | ||
|Describe length scale and resolution constraints=(see | |Describe length scale and resolution constraints=(see papers) | ||
|Describe time scale and resolution constraints=(see | |Describe time scale and resolution constraints=(see papers) | ||
|Describe any numerical limitations and issues=(see | |Describe any numerical limitations and issues=(see papers) | ||
}} | }} | ||
{{Model testing}} | {{Model testing}} | ||
Revision as of 09:19, 30 January 2020
GrainHill
Metadata
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Introduction
History
References
| Nr. of publications: | 1 |
| Total citations: | 7 |
| h-index: | 1 |
| m-quotient: | 0.17 |
| Featured publication(s) | Year | Model described | Type of Reference | Citations |
|---|---|---|---|---|
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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 | 7 |
| See more publications of GrainHill |
