Browse wiki
From CSDMS
About this component:
*This component was … About this component:</br>*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: https://csdms.colorado.edu/wiki/Model:TopoFlow.</br>*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.</br>*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.</br>*The Numerical Python module (numpy) is used for fast, array-based processing.</br>*This model has an OpenMI-style interface, similar to OpenMI 2.0. Part of this interface is inherited from "CSDMS_base.py".his interface is inherited from "CSDMS_base.py". +
Yes +
No but planned +
Single Processor +
Creation date"Creation date" is a predefined property that corresponds to the date of the first revision of a subject and is provided by <a target="_blank" rel="nofollow noreferrer noopener" class="external text" href="https://www.semantic-mediawiki.org/wiki/Help:Special_properties">Semantic MediaWiki</a>.
21:37:40, 17 February 2010 +
Collaborators include: Larry Hinzman (UAF), Bob Bolton, Anna Liljedahl (UAF), Stefan Pohl and others +
This model/component is typically not calibrated to fit data, but is run with a best guess or measured value for each input parameter. +
Available test data sets:
*Treynor watersh … Available test data sets:</br>*Treynor watershed, in the Nishnabotna River basin, Iowa, USA.</br>* (Two large rainfall events.)</br>*Small basin in Kentucky.</br>*Inclined plane for testing.</br>*Arctic watershed data from Larry Hinzman (UAF).</br>*See /data/progs/topoflow/3.0/data on CSDMS cluster./progs/topoflow/3.0/data on CSDMS cluster. +
Several test datasets are stored on the CSDMS cluster at: /data/progs/topoflow/3.0/data. +
The input variables used by the simple Gre … The input variables used by the simple Green-Ampt method for modeling infiltration are defined as follows:</br> K_s = saturated hydraulic conductivity (m / s)</br> K_i = initial hydraulic conductivity (m / s) (typically much less than Ks)</br> θ_s = soil water content at ψ=0 (unitless) (typically set to the porosity, φ)</br> θ_i = initial soil water content (unitless)</br> G = capillary length scale (meters) </br> = integral over all ψ of K(ψ) / K_s</br> = (almost always between ψ_B and 2*ψ_B)</br> P = precipitation rate (mm / sec)</br> M = snowmelt rate (mm / sec)</br></br>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:</br> Method code: 0</br> Method name: Green_Ampt</br> Number of layers: 1</br> Time step: Scalar 60.0000000 (sec)</br> Ks: Scalar 0.00000720 (m/s)</br> Ki: Scalar 0.00000010 (m/s)</br> qs: Scalar 0.48500001 (none)</br> qi: Scalar 0.37580763 (none)</br> G: Scalar 0.72400000 (m)</br> Closest soil_type: silt_loam</br> Save grid timestep: Scalar 60.00000000 (sec)</br> Save v0 grids: 0 Case5_2D-v0.rts (m/s)</br> Save I grids: 0 Case5_2D-I.rts (m)</br> Save pixels timestep: Scalar 60.00000000 (sec)</br> Save v0 pixels: 0 Case5_0D-v0.txt (m/s)</br> Save I pixels: 0 Case5_0D-I.txt (m)0 Case5_0D-I.txt (m) +
Equations Used by the Green-Ampt Method
f … Equations Used by the Green-Ampt Method</br> f_c = K_i + ((K_s - K_i) * (F + J) / F) = infiltrability (m / sec) (max infiltration rate)</br> = K_s + (J / F) * (K_s - K_i) = infiltrability (m / sec) (max infiltration rate)</br> J = G * (θ_s - θ_i) = a quantity used in previous equation (meters)</br> v_0 = min((P + M), f_c) = infiltration rate at surface (mm / sec) (K_s < (P + M))</br> = (P + M) = infiltration rate at surface (mm / sec) (K_s > (P + M))</br> F = ∫ v_0(t) d_t, (from times 0 to t) = cumulative infiltration depth (meters) (vs. I' in Smith (2002)iltration depth (meters) (vs. I' in Smith (2002) +
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. +
This model/component needs more rigorous testing. +
None, except visualization software. Grid sequences saved in netCDF files can be viewed as animations and saved as movies using VisIt. +
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. +
The Green-Ampt method for modeling infiltration. +
The basic stability condition is: dt < … The basic stability condition is: dt < (dx / u_min), where dt is the timestep, dx is the grid cell size and u_min is the smallest velocity in the grid. This ensures that flow cannot cross a grid cell in less than one time step. Typical timesteps are on the order of seconds to minutes. Model can be run for a full year or longer, if necessary. run for a full year or longer, if necessary. +
Active +
This process component is part of a spatially-distributed hydrologic model called TopoFlow, but it can now be used as a stand-alone model. +
Scott +
Has query"Has query" is a predefined property that represents meta information (in form of a <a target="_blank" rel="nofollow noreferrer noopener" class="external text" href="https://www.semantic-mediawiki.org/wiki/Subobject">subobject</a>) about individual queries and is provided by <a target="_blank" rel="nofollow noreferrer noopener" class="external text" href="https://www.semantic-mediawiki.org/wiki/Help:Special_properties">Semantic MediaWiki</a>.
Last editor is"Last editor is" is a predefined property that contains the page name of the user who created the last revision and is provided by <a target="_blank" rel="nofollow noreferrer noopener" class="external text" href="https://www.semantic-mediawiki.org/wiki/Help:Special_properties">Semantic MediaWiki</a>.
0.06 +
Standard +
Hydrology +
infiltration +, component +, green-ampt +, method +, model called topoflow +, spatially-distributed hydrologic model +, hydrologic model called +, called topoflow +, process component +, component is part +, spatially-distributed hydrologic +, hydrologic model +, model called +, stand-alone model +, topoflow +, model +, process +, part +, basins + and topoflow-infiltration-green-ampt +
basins +
Single +
This site. +
Modification date"Modification date" is a predefined property that corresponds to the date of the last modification of a subject and is provided by <a target="_blank" rel="nofollow noreferrer noopener" class="external text" href="https://www.semantic-mediawiki.org/wiki/Help:Special_properties">Semantic MediaWiki</a>.
16:36:04, 6 June 2025 +
1 +
Infiltration process component (Green-Ampt method) for a D8-based, spatial hydrologic model +
1560 30th street +
80305 +
true +
None (but uses NumPy package) +
Apache public license +
Python +
Minutes to hours +
Through web repository +
https://github.com/peckhams/topoflow +
2001 +
Model developer +
