WebbThe group ray in r-space is computed by integrating dr — = v„ (11) dt which is the group ray trajectory of the waves. Thus, co and k propagate with v„, while the phase front pro … Webbthe Amplitude equation to describe how the amplitude of the waves changes as the rays propagate. 2 Ray Theory We will de ne a ray as the curve which is everywhere perpendicular to the surface of constant phase, . Let ˝be an arbitrary parameter for the ray curve and ~r(˝) = X 1(˝)^e 1 +X 2(˝)^e 2 + X 3(˝)^e

Variational principles for surface wave propagation on a laterally ...

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