Theory 20/Froude Number/Tsunami run-up
Run-Up Is a Froude Problem
The claim
Tsunami run-up height is set by the Froude number of the wave at the shore, so two waves of equal height produce different inundation depending on their speed.
01Mechanism
Run-up depends on how much kinetic energy converts to potential as the wave decelerates on the slope; the ratio sets that conversion.
02Prediction
Run-up should track the Froude number.
03Refutation
Run-up tracking wave height alone would remove speed.