TM No. 3U2 



CONCLUDING KEMmKB 



The statistical calculations using hypothetical ^ra,ve models indicated 

 that very small negative correlations between the horizontal and vertical 

 particle motions can provide relatively large stresses in the wave regime. 



These first attempts to eAra,luate Reynolds stresses in open ocean waves 

 produced relatively large stresses in the range of -20 cm^ sec"l and even 

 larger. Similarly; the linear correlation coefficients are of the order of 

 -0.1 to -0.2. The covarianee spectra indicated that the main contribution 

 to the covarianee occurs at the ambient wave frequencies . 



It is concluded that tjrpes of instruments as OMDUM III can prove useful in 

 the assessment of spectral characteristics of wave motions as a function of 

 meteorological conditions, sea state , and depth from the free sixrface. 

 Properly applied instrumentation such as described in this report can be 

 used to determine ambient turbulent conditions caused by wind waves for 

 comparison with artificially produced turbulence caused by vessels. 



Further studies are being made of the dynamic response characteristics 

 of the ducted meter system, with particiilar emphasis on its response to small 

 scale eddy sizes and "off -angle" flow. Also, use of a drag sphere system 

 for sensing shear stresses is \mder investigation. 



REFERENCES 



1. Starr, V. P., I961, Hydro dynamical Red-Shift Phenomena in Geophysics, 

 Pure and Applied Geophys, Vol. U8; p. 109 . 



2. Shonting, D. H., I96U, A Preliminary Investigation of Momentum Flux in 

 Ocean Waves, Pure and Applied Geophys, Vol. 57; PP- 1^9-152. 



3. Tukey, J. W., 19U9, The Sampling Theory of Power Spectrum Estimates 

 Symposium on Applications of Autocorrelation Analysis to Physical 

 Problems, Woods Hole, Mass. OW. Pub. hj . 



h, Lai±), H., 1879, Hydrodynamics, Dover Pub., New York, N.Y.; 738 pp. 



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