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This is not a tidal wave server so your question is off-topic. Tidal waves have to do with fluid dynamics, and is not a geometric concern, which is the ground below your feet.
explain nodal points
not even the globe can, if you didn't know
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Shoaling, the effect of the seabed profile (on the water surface above) surrounding a landmass.
This also in part accounts for bottom up occlusion of boats going out to sea.