Model:SPACE

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SPACE

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Summary Contact Technical specs In/Output Process Testing Other Component info Also known as Landlab Stream Power with Alluvium Conservation and Entrainment component 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 Continental, Landscape-Scale, Reach-Scale, Regional-Scale, Watershed-Scale Model domain Terrestrial One-line model description Landlab component for 2-D calculation of fluvial sediment transport and bedrock erosion Extended model description The Landlab SPACE (Stream Power with Alluvium Conservation and Entrainment) enables modeling of bedrock, alluviated, and bedrock-alluvial rivers by simultaneously conserving mass in three reservoirs: the water column, the alluvial bed, and the underlying bedrock. SPACE allows dynamic transitions between detachment-limited, transport-limited, and intermediate states. SPACE calculates sediment fluxes, alluvial layer thickness, and bedrock erosion at all nodes within the model domain. An extended description of the model may be found in Shobe et al (2017, Geoscientific Model Development). Keywords: River Erosion, Sediment Transport, Bedrock Erosion, Landscape Evolution, Name Charles Shobe Type of contact Model developer Institute / Organization CIRES and Department of Geological Sciences, University of Colorado Postal address 1 UCB 399 Postal address 2 Town / City Boulder Postal code 80309-0399 State Colorado Country United States Email address charles.shobe@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 2016 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 Source code availability (Or provide future intension) Through web repository Source web address https://github.com/landlab/landlab/tree/master/landlab/components/space Source csdms web address Program license type BSD or MIT X11 Program license type other Memory requirements variable Typical run time variable Describe input parameters [[Describe input parameters model::This component operates on a Landlab RasterModelGrid instance, and requires that the user has downloaded and installed Landlab. Parameters ---------- grid : ModelGrid Landlab ModelGrid object K_sed : float Erodibility constant for sediment (units vary). K_br : float Erodibility constant for bedrock (units vary). F_f : float Fraction of permanently suspendable fines in bedrock [-]. phi : float Sediment porosity [-]. H_star : float Sediment thickness required for full entrainment [L]. v_s : float Effective settling velocity for chosen grain size metric [L/T]. m_sp : float Drainage area exponent (units vary) n_sp : float Slope exponent (units vary) sp_crit_sed : float Critical stream power to erode sediment [E/(TL^2)] sp_crit_br : float Critical stream power to erode rock [E/(TL^2)] method : string Either "simple_stream_power", "threshold_stream_power", or "stochastic_hydrology". Method for calculating sediment and bedrock entrainment/erosion. discharge_method : string Either "area_field" or "discharge_field". If using stochastic hydrology, determines whether component is supplied with drainage area or discharge. area_field : string or array Used if discharge_method = 'area_field'. Either field name or array of length(number_of_nodes) containing drainage areas [L^2]. discharge_field : string or array Used if discharge_method = 'discharge_field'.Either field name or array of length(number_of_nodes) containing drainage areas [L^2/T]. solver : string Solver to use. Options at present include: (1) 'basic' (default): explicit forward-time extrapolation. Simple but will become unstable if time step is too large. (2) 'adaptive': subdivides global time step as needed to prevent slopes from reversing and alluvium from going negative.]] Input format Other input format Passed in as arguments in Landlab component call Describe output parameters Returns/updates Landlab grid fields: 'topographic__elevation' : Topographic surface elevation 'bedrock__elevation' : Bedrock surface elevation 'soil__depth' : Depth of alluvial layer on river bed 'sediment__flux' : Sediment flux out of each grid node Output format Other output format Landlab grid field 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 Fluvial sediment erosion and deposition, fluvial bedrock erosion, the bedrock cover effect. Describe key physical parameters and equations The key equations and parameters are described in Shobe et al (2017, Geoscientific Model Development). Describe length scale and resolution constraints Length scale should be reach or larger (~100m and up). Run time depends on grid size and resolution. Describe time scale and resolution constraints Time scale will be set by discharge calculation method. The model is in general intended for annual to geological time scales, but shorter time scales may be used if Landlab dynamic flow routing components are employed. Describe any numerical limitations and issues Becomes very slow if run on domains with pits. Options include filling pits before running the model, or using the Landlab DepressionFinderAndRouter. Describe available calibration data sets The model is tested against three known analytical solutions (see Shobe et al., 2017 for details). 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? Yes Upload manual if available: Media:SPACE manual and examples.zip Model website if any Model forum / discussion board Comments This part will be filled out by CSDMS staff OpenMI compliant Yes BMI compliant Yes WMT component No but possible PyMT component Yes Is this a data component Can be coupled with:

Model info Authors Charles Shobe Source code Go to external source code site Model citations Nr. of publications: 2 Total citations: 62 h-index: 1 m-quotient: 0.11 QR-code Link to this page Other models by author BRaKE BlockLab Drainage Density ErosionDeposition SPACE

Introduction

SPACE is the Stream Power with Alluvium Conservation and Entrainment model, a Landlab component for 2-D calculation of fluvial sediment transport and bedrock erosion. SPACE was developed by Charles Shobe, Gregory Tucker, and Katherine Barnhart at the University of Colorado. It is not a stand-alone model, but is a component of the Landlab modeling toolkit.

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Nr. of publications:	2
Total citations:	62
h-index:	1
m-quotient:	0.11

Featured publication(s)	Year	Model described	Type of Reference	Citations
Shobe, Charles M.; Tucker, Gregory E.; Barnhart, Katherine R.; 2017. The SPACE 1.0 model: a Landlab component for 2-D calculation of sediment transport, bedrock erosion, and landscape evolution. Geoscientific Model Development, 10, 4577–4604. 10.5194/gmd-10-4577-2017 (View/edit entry)	2017	Landlab SPACE	Model overview	61
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