tREADME.rst - pism - [fork] customized build of PISM, the parallel ice sheet model (tillflux branch)
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       tREADME.rst (1385B)
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            1 Example: relax Greenland's basal topograpy
            2 ======================
            3  
            4 This minimal example shows how we can calculate the isostatically-relaxed
            5 basal topography for an ice-free Greenland.  The same method can be
            6 applied to other areas.  It uses the flux correction method
            7 "force-to-thickness" with a target thickness of zero to remove all ice
            8 combined with the Lingle-Clark bed deformation model to calculate
            9 isostatic uplift.
           10 
           11 How to run it
           12 -------------------------
           13 
           14 First, download the SeaRISE data set running
           15 
           16 ``$ ./preprocess.sh``
           17 
           18 or, alternatively, provide a data set of your choice.  For example, you can
           19 make a link to the SeaRISE data set downloaded into
           20 ``examples/searise-greenland/``, if the example in Chapter 1 of the
           21 User's Manual has already run.
           22 
           23 Then run
           24 
           25 ``$ ./run-relax.sh N M``
           26 
           27 where N is the number of processors and M defines the grid resolution
           28 (0: 20km [default], 1: 10km, 2: 5km, 3: 2.5km, 4: 2km, 5: 1km). To run the
           29 example on 16 cores and 5km horizontal grid resolution, in the background,
           30 and store ``stdout`` output in a text file, type
           31 
           32 ``$ ./run-relax.sh 16 2 &> out.relax &``
           33 
           34 First, the model is run for 1,000 years using flux-correction to
           35 remove (most) of the ice. The second simulation continues from the
           36 first, but now with the option -no_mass, for another 50,000 years
           37 (Note: this number was defined ad-hoc, and may or may not be appropriate).