Shear-Gravity Wave
Shear-Gravity Wave :
A combination of gravity waves and a Helmholtz wave on a surface of discontinuity of density and velocity. If the densities of the lower and upper layers c_pU + p'U'± p + p' respectively are p and p' and the velocities U and U the phase speed of the shear-gravity wave is: gLp-p' pff(U-U)1 in p + p' (p + p'Y where g is the acceleration of gravity and L the wave length. The motion is unstable if and only if the bracketed quantity is negative; the density difference thus contributes to stability and the velocity difference to instabdity. N.B. Refer to source to verify equation(s)
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