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SCHISM tutorial update - #2941

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update-schism-tutorial
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update-schism-tutorial

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@fluidnumericsJoe

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Following up from #2928 , this PR adds a section on things to consider when adapting the SCHISM tutorial to other use cases. This covers time step size / CFL, interpolator choice, and handling grid search errors. Links to other internal parcels documentation are included for each consideration.

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In the tilmestep comment, should we also suggest that users could experiment with adaptive time stepping in e.g. AdvectionRk45? Have you tried that already for unstructured grids? Does it work (well)?

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I have not tried this yet, but will check it out. I'm playing with a CFL guided time step reduction per particle and will compare with RK45

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Also, the figures don't load well in RTD? https://parcels--2941.org.readthedocs.build/en/2941/user_guide/examples/tutorial_schism.html. Can you check what's going on?

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I must've not committed them. oops. I'll get that sorted

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