[gizmo]

You could totally cheat the river physics. The game would look better and nobody would know.

[schiffern]

It needn't even be that much of a cheat! There are empirically validated equations that can '1-dimensionally' model river meander evolution.

https://www.osti.gov/servlets/purl/1018448

https://agupubs.onlinelibrary.wiley.com/doi/pdfdirect/10.102...

[hnuser123456]

I'd never heard of the OSTI before. Interesting.