eSCAPE accounts for both hillslope processes (soil creep using linear diffusion) and fluvial incision (stream power law). It can be forced using spatially and temporally varying tectonics (vertical displacements) and climatic conditions (precipitation changes and/or sea-level fluctuations).
domain: definition of the unstructured grid containing the vtk grid filename and the associated field (here called Z) as well as the flow direction method to be used flowdir that takes an integer value between 1 (for SFD) and 12 (for Dinf) and the boundary conditions (bc: ‘flat’, ‘fixed’ or ‘slope’)
time: the simulation time parameters defined by start, end, tout (the output interval) and dt (the internal time-step).
Follows the optional forcing conditions:
sea: the sea-level declaration with the relative sea-level position (m) and the sea-level curve which is a file containing 2 columns (time and sea-level position).
climatic & tectonic have the same structure with a sequence of events defined by a starting time (start) and either a constant value (uniform) or a map.
Then the parameters for the surface processes to simulate:
spl: for the stream power law with a unique parameter Ke representing the The erodibility coefficient which is scale-dependent and its value depend on lithology and mean precipitation rate, channel width, flood frequency, channel hydraulics. It is worth noting that the coefficient m and n are fixed in this version and take the value 0.5 & 1 respectively.
diffusion: hillslope, stream and marine diffusion coefficients. hillslopeK sets the simple creep transport law which states that transport rate depends linearly on topographic gradient. River transported sediment trapped in inland depressions or internally draining basins are diffused using the coefficient (streamK). The marine sediment are transported based on a diffusion coefficient oceanK. The parameter maxIT specifies the maximum number of steps used for diffusing sediment during any given time interval dt.
Finally, you will need to specify the output folder:
output: with dir the directory name and the option makedir that gives the possible to delete any existing output folder with the same name (if set to False) or to create a new folder with the give dir name plus a number at the end (e.g. outputDir_1 if set to True)
+ an extension of the parallel priority-flood depression-filling algorithm from (Barnes, 2016) to unstructured mesh is used to simulate sedimentation in upland areas and internally drained basins.
+ marine sedimentation is based on a diffusion algorithm similar to the technique proposed in pybadlands (Salles, Ding, & Brocard, 2018).
+ landscape dynamic by the stream power law
+ marine deposition by diffusion
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