Summary
Also known as
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Model type
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Single
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Model part of larger framework
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Note on status model
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Date note status model
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basins,
Technical specs
Supported platforms
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Unix, Linux, Mac OS, Windows
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Other platform
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Programming language
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Python
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Other program language
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None (but uses NumPy package)
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Code optimized
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Single Processor
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Multiple processors implemented
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Nr of distributed processors
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Nr of shared processors
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Start year development
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2001
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Does model development still take place?
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Yes
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If above answer is no, provide end year model development
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Code development status
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When did you indicate the 'code development status'?
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Model availability
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As code, As teaching tool
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Source code availability (Or provide future intension)
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Through CSDMS repository
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Source web address
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Source csdms web address
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Program license type
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Apache public license
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Program license type other
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Memory requirements
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Standard
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Typical run time
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Minutes to hours
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In/Output
Describe input parameters
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The input variables for the Priestley-Taylor method of estimating losses due to evaporation are defined as follows:
Q_SW = net shortwave radiation (W / m^2)
Q_LW = net longwave radiation (W / m^2)
T_air = air temperature (deg C)
T_surf = surface (snow) temperature (deg C)
T_soil_x = soil temperature at depth x (deg C)
x = reference depth in soil (m)
K_soil = thermal conductivity of soil (W / (m deg_C))
α = coefficient (unitless)
L_v = latent heat of vaporization, water (J / kg) (2500000)
The behavior of this component is controlled with a configuration (CFG) file, which may point to other files that contain input data. Here is a sample configuration (CFG) file for this component:
Method code: 0
Method name: Priestley-Taylor
Time step: Scalar 3600.00000000 (sec)
alpha: Scalar 1.20000000 (none)
K_soil: Scalar 0.44999999 (W/m/deg_C)
soil_x: Scalar 0.05000000 (m)
T_soil_x: Scalar 0.00000000 (deg C)
Save grid timestep: Scalar 60.00000000 (sec)
Save er grids: 0 Case5_2D-ETrate.rts (m/s)
Save pixels timestep: Scalar 60.00000000 (sec)
Save er pixels: 0 Case5_0D-ETrate.txt (m/s)
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Input format
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ASCII, Binary
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Other input format
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Describe output parameters
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Output format
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ASCII, Binary
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Other output format
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Pre-processing software needed?
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Yes
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Describe pre-processing software
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Another program must be used to create the input grids. This includes a D8 flow grid derived from a DEM for the region to be modeled. The earlier, IDL version of TopoFlow can be used to create some of these.
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Post-processing software needed?
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Yes
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Describe post-processing software
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None, except visualization software. Grid sequences saved in netCDF files can be viewed as animations and saved as movies using VisIt.
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Visualization software needed?
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Yes
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If above answer is yes
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Other visualization software
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VisIt
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Process
Describe processes represented by the model
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Priestley-Taylor method of estimating losses due to evaporation
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Describe key physical parameters and equations
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Main equations used by this component:
ET = (1000 * Q_et) / (ρ_water * L_v) = evaporation rate (mm / sec)
Q_et = α * (0.406 + (0.011 * T_air)) * (Q_SW + Q_LW - Q_c) = energy flux used to evaporate water (W / m^2)
Q_c = K_soil * (T_soil_x - T_surf) * (100 / x) = conduction energy flux (W / m^2)
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Describe length scale and resolution constraints
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Recommended grid cell size is around 100 meters, but can be parameterized to run with a wide range of grid cell sizes. DEM grid dimensions are typically less than 1000 columns by 1000 rows.
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Describe time scale and resolution constraints
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Typical timesteps are on the order of seconds to minutes. Model can be run for a full year or longer, if necessary.
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Describe any numerical limitations and issues
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This model/component needs more rigorous testing.
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Testing
Describe available calibration data sets
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This model/component is typically not calibrated to fit data, but is run with a best guess or measured value for each input parameter.
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Upload calibration data sets if available:
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Describe available test data sets
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Available test data sets:
- Treynor watershed, in the Nishnabotna River basin, Iowa, USA.
- (Two large rainfall events.)
- Small basin in Kentucky.
- Inclined plane for testing.
- Arctic watershed data from Larry Hinzman (UAF).
- See /data/progs/topoflow/3.0/data on CSDMS cluster.
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Upload test data sets if available:
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Describe ideal data for testing
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Several test datasets are stored on the CSDMS cluster at: /data/progs/topoflow/3.0/data.
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Other
Do you have current or future plans for collaborating with other researchers?
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Collaborators include: Larry Hinzman (UAF), Bob Bolton, Anna Liljedahl (UAF), Stefan Pohl, Tom Over and others
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Is there a manual available?
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Yes
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Upload manual if available:
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Model website if any
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This site.
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Model forum / discussion board
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Comments
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About this component:
- This component was developed as part of the TopoFlow hydrologic model, which was originally written in IDL and had a point-and-click GUI. For more information on TopoFlow, please goto: http://csdms.colorado.edu/wiki/Model:TopoFlow.
- When used from within the CSDMS Modeling Tool (CMT), this component has "config" button which launches a graphical user interface (GUI) for changing input parameters. The GUI is a tabbed dialog with a Help button at the bottom that displays HTML help in a browser window.
- This component also has a configuration (CFG) file, with a name of the form: <case_prefix>_channels_diff_wave.cfg. This file can be edited with a text editor.
- The Numerical Python module (numpy) is used for fast, array-based processing.
- This model has an OpenMI-style interface, similar to OpenMI 2.0. Part of this interface is inherited from "CSDMS_base.py".
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Download statistics
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Introduction
History
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Issues
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Output Files
Download source code
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