Yes, Stokes flow all day! Also, most marshy places are flat, and most flat places are notoriously windy so the usefulness would be generally quite low. However

Yes, Stokes flow all day! Also, most marshy places are flat, and most flat places are notoriously windy so the usefulness would be generally quite low. However, my sense is that the real dealbreaker is that it’s impossible to find a suitably insulating material. A sphere with r=30m is already over a hectare of surface area.