A standing wave on the Don River today.
— Mathew Wells (@EFD_Toronto) November 26, 2018
Technically this occurs when the downstream velocity U matches the upstream wave-speed, given by sqrt(g H) where g is gravity and H depth of river, so that Froude number Fr = U/sqrt(g H) ~ 1. pic.twitter.com/JmDjolx4hC
via Twitter https://twitter.com/EFD_Toronto
November 27, 2018 at 01:40AM
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