Model:SPACE

SPACE

Metadata

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	Only maintenance
When did you indicate the 'code development status'?	2020
Model availability
Source code availability (Or provide future intension)	Through web repository
Source web address	https://github.com/landlab/landlab
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:	96
h-index:	2
m-quotient:	0.2

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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.

History

References

Nr. of publications:	2
Total citations:	96
h-index:	2
m-quotient:	0.2

Featured reference(s)	Open Access Status	Year	Type of Reference	Cited
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, 104577–4604. 10.5194/gmd-10-4577-2017	cc-by · publishedVersion	2017	a module overview describing a module	83

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Output Files