Savitsky 



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 J. Fluid Mech. , Vol. 5, part 2 , pp. 177-192, 1959. 



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 University Press. 



Pierson, W. J. , Jr. , "The interpretation of crossed orthogonals in 



wave refraction problems , " U. S. Army, Corps of Engineers, 

 Beach Erosion Board, Tech. Report No. 21, January 1951. 



Stewart, R. W. and Grant, H. L. , "Determination of the rate of 

 dissipation of turbulent energy near the sea surface in the 

 presence of waves , " J. Geophysical Res., Vol. 67, No. 8, 

 pp. 3177-3180. 



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 1964. 



* * * >!« * 



DISCUSSION 



Dr. N. Hogben 

 National Physical Laboratory ^ Ship Division 

 Feltham^ Middlesex^ England 



Dr. Savitsky has undertaken a very interesting investigation 

 of the effect of turbulence on waves in an oceanographic context. 

 His main finding is that waves can be dramatically attenuated by 

 turbulence from travelling grids. He explains this in terms of 

 refraction and diffraction and comments on the potential use for 

 quieting sea waves. 



Whilst listening to his presentation It occurred to me that his 

 findings may also have an important bearing on the understanding of 

 wavemaklng by ships. It is a common experience that the wave 

 systenn originating from the stern region of a ship tends to have 

 nnuch smaller amplitudes than would be predicted from the usual 

 theories. I would be glad If Dr. Savitsky could comment on whether 

 this suppression of wavemaklng by ship sterns may be at least partly 

 explained In terms of a refraction and diffraction analysis such as he 

 has described In the paper, applied to the Interaction between the 

 vortlclty and turbulence In the boundary layer and wake and the stern 

 wave system, 



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