[nxobject]

In general, are aware of any physically-based long-term geological process models with real life fidelity as a goal, and that have a remote chance of being feasible for gamedev?

I imagine that, analogous to work done in weather forecasting, someone can shove DEM files into the pattern-matching engine of an AI, but I do wonder how feasible a completely algorithmic model will be.

[Cristan]

Not sure if this is what you're asking, but take a look at Terra Firma on Steam: https://store.steampowered.com/app/1482770/Terra_Firma/

I don't know what tech they're using, but it does have erosion, water flow and sediments, plus others. I see they're planning a paid version with more features this year. I've only played an alpha some time ago, but it should be possible to export the maps to use in other programs.