Dry Bed
Dry Bed :
The relatively dry ground area bordering the shore where a tsunami running up the shore forms a surge. The word "dry" does not necessarily imply that the soil is effectively dry, but from a fluid mechanics standpoint, the momentum transfer from the surge to the layer of fluid ahead is negligible, which is not the case of tidal bore or moving hydraulic jump as previously mentioned. From a fluid mechanics viewpoint, a surge on a dry bed is not a shock wave but rather a rarefaction wave
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