Model:OverlandFlow

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OverlandFlow

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Summary Contact Technical specs In/Output Process Testing Other Component info Also known as Landlab OverlandFlow 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 Landscape-Scale, Reach-Scale, Watershed-Scale Model domain Terrestrial, Hydrology One-line model description Component simulating overland flow using a 2-D numerical approximation of the shallow-water equations following the de Almeida et al., 2012 algorithm for storage-cell inundation modeling. Extended model description The Landlab OverlandFlow component is based on a simplified inertial approximation of the shallow water equations, following the solution of de Almeida et al. (2012). This explicit two-dimensional hydrodynamic algorithm simulates a flood wave across a model domain, where water discharge and flow depth are calculated at all locations within a structured (raster) grid. This component generates a hydrograph at all grid locations, and allows for flow to move in one of the four cardinal directions (D4) into/out of a given model node. Keywords: Name Jordan Adams Type of contact Model developer Institute / Organization University of Colorado Postal address 1 Postal address 2 Town / City Boulder Postal code 80301 State Colorado Country United States Email address jordan.adams@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 2012 Does model development still take place? No If above answer is no, provide end year model development Code development status When did you indicate the 'code development status'? Model availability As code, As teaching tool Source code availability (Or provide future intension) Through web repository Source web address https://github.com/landlab/landlab/tree/master/landlab/components/overland_flow 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 This component operates on a Landlab RasterModelGrid instance, and requires that the user has downloaded and installed Landlab. Parameters listed below are required. Ones noted as (optional) will revert to the prescribed default values as described in the documentation. Input parameters include: grid : A Landlab RasterModelGrid, representing the topography h_init : (optional) Thickness of initial thin layer of water on the surface alpha : (optional) Time step coeffcient, described in Bates et al., 2010 and de Almeida et al., 2012. mannings_n : (optional) Manning's roughness coefficient. g : (optional) Acceleration due to gravity (m/s^2). theta : (optional) Weighting factor from de Almeida et al., 2012. rainfall_intensity : (optional) Rainfall intensity. Input format ASCII Other input format Describe output parameters The Landlab OverlandFlow component outputs data as Landlab fields - numpy arrays containing data with the associated CSDMS standard name, listed below: 'surface_water__depth' : NumPy array of length nnodes. Water depths at a given time step. 'surface_water__discharge' : NumPy array of length nlinks. Water discharge values at a given time step. 'water_surface__gradient' : NumPy array of length nlinks. Water surface gradient at a given time step. Output format Other output format 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 Routes a hydrograph (changing water discharges through time) across a gridded model terrain. At each location, water discharge is calculated at each time step as a function of surface roughness, local water depths and water surface slopes. Describe key physical parameters and equations The key algorithms and parameters are described in length the Geoscientific Model Development paper by Adams et al., (2017). Describe length scale and resolution constraints The model works best at watershed-scale domains, 100 km^2 and less have been tested. Of course, this is highly dependent on the grid resolution. Describe time scale and resolution constraints The model works best for event to decadal time scales on a personal machine. Describe any numerical limitations and issues Describe available calibration data sets The model is tested against the known analytical solution (see Adams et al., 2017 for more details). It is unit-tested against this analytical solution every time Landlab is updated. 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:OverlandFlow Users Manual.pdf 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 Yes PyMT component Yes Is this a data component Can be coupled with:

Model info Authors Jordan Adams Source code Go to external source code site Model citations Nr. of publications: 1 Total citations: 46 h-index: 1 m-quotient: 0.11 QR-code Link to this page Other models by author DetachmentLtdErosion FireGenerator OverlandFlow OverlandFlowBates PrecipitationDistribution

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Nr. of publications:	1
Total citations:	46
h-index:	1
m-quotient:	0.11

Featured publication(s)	Year	Model described	Type of Reference	Citations
Adams, Jordan M.; Gasparini, Nicole M.; Hobley, Daniel E. J.; Tucker, Gregory E.; Hutton, Eric W. H.; Nudurupati, Sai S.; Istanbulluoglu, Erkan; 2017. The Landlab v1.0 OverlandFlow component: a Python tool for computing shallow-water flow across watersheds. Geoscientific Model Development, 10, 1645–1663. 10.5194/gmd-10-1645-2017 (View/edit entry)	2017	Landlab OverlandFlow	Model overview	46
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