Скачать или смотреть We can imagine the ocean surface as a sum of sine waves with different amplitudes and phases. Let x…

We can imagine the ocean surface as a sum of sine waves with different amplitudes and phases. Let x and y be horizontal coordinates and z be the vertical coordinate where z corresponds to a flat, undisturbed ocean surface. Then we locate any point (x, y, z) on the surface by z = Σn sin(knx + lny + ωnt + δn), n=1. Find a unit normal vector to the surface. It might be convenient to define θn (x, y, z, t) = knx + lny + ωnt + δn.

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