Phillips 



REFERENCES 



1. Benjamin, T.B., and Feir, J.E., "The Disintegration of Wave Trains on 

 Deep Water, Part 1 - Theory," J. Fluid Mech. 27:417 (1967) 



2. Phillips, O.M., "Theoretical and Experimental Studies of Gravity Wave In- 

 teractions," Proc. Roy. Soc. A299:104 (1967) 



3. Longuet-Higgins, M.S., and Smith, N.D., "An Experiment on Third Order 

 Resonant Wave Interactions," J. Fluid Mech. 25:421 (1966) 



4. McGoldrick, L.F., Phillips, O.M., Huang, N., and Hodgson, T., "Measure- 

 ments on Resonant Wave Interactions," J. Fluid Mech. 25:437 (1966) 



5. Ball, K., "Energy Transfer Between External and Internal Gravity Waves," 

 J. Fluid Mech. 19:465 (1964) 



6. Thorpe, S.A., "On Wave Interactions in a Stratified Fluid," J. Fluid Mech. 

 24:737 (1966) 



7. McGoldrick, L.F., "Resonant Interactions Among Capillary-Gravity Waves,' 

 J. Fluid Mech. 21:305 (1965) 



8. Hasselmann, K., "On the Non-Linear Energy Transfer in a Gravity Wave 

 Spectrum, Part 3," J. Fluid Mech. 15:385 (1963) 



9. Phillips, O.M., "The Dynamics of the Upper Ocean," Cambridge University 

 Press, 1966 



10. Bretherton, F.P., "Resonant Interactions Between Waves," J. Fluid Mech. 

 20:457 (1964) 



DISCUSSION 



T. Brooke Benjamin 



Institute of Geophysics and Planetary Physics 



University of California, San Diego 



La Jolla, California 



{on leave from the University of Cambridge) 



In his interesting paper Prof. Phillips has demonstrated analytically that 

 internal waves can be channeled horizontally by interaction with a periodically 

 layered distribution of horizontal currents. This result seems to have consid- 

 erable potential value as regards the interpretation of internal-wave motions in 

 the ocean and in the atmosphere. I wish now to summarize an alternative anal- 

 ysis of the mechanism of channeling, proceeding on lines quite different from 



544 



