The fluvial sediment transport equations are quasi-diffusive and typically have orders of magnitude spatial variations in rate coefficient (reflecting differences in water discharge), which makes the system of equations stiff. The model has been mostly used to address time scales relevant to significant topographic evolution, though in the case of rapidly changing landscapes (e.g., gully networks) this can be as short as decades.ĭescribe any numerical limitations and issues The steady flow assumption used by most (not all) hydrology sub-models restricts time scale to periods significantly longer than a single storm. Resolutions greater than about 10,000 nodes normally require significant computation time.ĭescribe time scale and resolution constraints In principle, the model can address spatial scales ranging from gullies and small (~1km2) catchments to mountain ranges, as long as setup and parameters are chosen appropriately. (2001a), the CHILD Users Guide, and other documents listed in the bibliography.ĭescribe length scale and resolution constraints Too many to list here - see Tucker et al. Depending on the application, the user can apply a vegetation-growth module, various tectonic functions, and other options.ĭescribe key physical parameters and equations In addition, a post-processing program called CHILD2VTK is available to convert output into VTK format for use in visualization programs such as ParaView.ĭescribe processes represented by the modelīasic processes include runoff generation, water erosion and sediment transport, and gravitational erosion and sediment transport. A few scripts also exist for IDL, and it is possible to process the output to generate lists of points for input to ArcGIS. Outputs include grids of surface elevation, drainage area, gradient, stratigraphy, drainage direction, Voronoi cell areas, sediment texture data on mesh configuration total landscape volume and change in volume at each storm (time step) list of storm durations, timing, and intensities.Īn extensive library of Matlab scripts provides visualization and post-processing capabilities. Uses a formatted text file for input of parameters. Topography z(x,y) or parameters describing a topographic surface rate coefficients switches for activating options and choosing between alternative transport/erosion formulas.
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