ferent depth, would delineate the relationship between amplitude 

 and phases at these different depths, 

 IV, Recommendations for future work 



The project as it has developed so far has opened several 

 avenues of approach which, if followed, should yield interesting 

 and useful results of a practical nature. These consist partly 

 of extending approaches already employed by utilizing more ade- 

 quate data, and partly new approaches suggested by various phases 

 of the work and by the literature. They may be summarized as 

 follows : 



a. A re-evaluation should be made of the first portion of 

 this study dealing with the direct effect of meteorological pa- 

 rameters, such as radiation, evaporation, and wind. It seems 

 clear that the small changes in the thermal structure caused by 

 changes in these parameters must have an important effect on 

 operational problems connected with sound. It is believed that 

 with increased accuracy of the instruments discussed above, es- 

 pecially those such as the thermopile dealing with the measure- 

 ment of temperature, much useful information may be obtained, 



b. It is planned to continue and expand the effort to ar- 

 rive at useful empirical relationships aimed at predicting the 

 mixed layer depth, 



c. Further computations using the continuous density model 

 of Pjeldstad are proposed, by utilising more accurate data and 

 making such revisions of the technique as necessary, 



d. It is also planned to investigate the possibility of 

 attacking the problem of tidal oscillations in a direct manner, 



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