Originally Posted by
BraceBrace
AFAIK wake vortices create short term turbulence and roll motions. Ground effect is something completely different. In ground effect you speed remains ’normal’, vortices would create large speed fluctuations and possible instant roll.
Agreed. Just the top of my head- the pics that you see in textbooks- wake vortices are something like doughnuts (rings) trailing behind the wingtips right? So on the ground and near to touchdown, wouldn't these doughnuts or rings be broken by the tarmac and thus form some sort of half-ring cushion of air?