UNCLASSIFIED 



Security Classification 



DOCUMENT CONTROL DATA - R&D 



(Security claaaiticalion ot title, body ol abstract and indexirig annotation muat be entered ivhen the overall report ia c lassilied) 



I ORIGINATIN G ACT|V|-^Y (Corporalo author) 



Naval Underwater Weapons Research and Engineering 

 Station, Newport, R. I. 



2a, REPORT SECURI TY CLASSIFICATION 



UNCLA.SSIFIED 



Zb GROUP 



3. REPORT TITLE 



OBSERVATIONS OF PARTICLE MOTIONS IN OCEAN WAVES 



4 DESCRIPTIVE NOTES (Type of report and inclusive dales) 



(2 Volumes ) 



5 HUJHOR(S) (Last name. Itrst name, initial) 



Shonting, David H. 



6 REPORT DATE 



July 1967 



Jla^ TOTAL NO. OF 



Vol. 1 - 320 

 Vol. 2 - 'loO 



76 NO OF REFS 



111 



8a. CONTRACT OR GRANT NO. 



b. PROJECT NO. 



9a. ORIGINATOR'S REPORT NUMBERCS; 



TM No . . 377 



c. Task Assignment No. 



RU22-2E -000/219 l/RlOlt-03-Ol 



d. 



9b. OTHER REPORT NO(S) (A ny other numbers that may be assigned 

 this report) 



10. AVAILABILITY/LIMITATION NOTICES 



Distribution of this report is unlimited. 



11 SUPPLEMENTARY NOTES 



12. SPONSORING MILITARY ACTIVITY 



NUWS - NOSC 



13 ABSTRACT 



Ducted impeller wave meters were suspended from the Buzzards Bay Entrance 

 Light Station to measure particle motions in wind waves at various depths 

 "beneath the free surface. The motions recorded display quasisinusoidal oscil- 

 lations having an approximate 90° phase shift between the horizontal and vertical 

 velocity components that lie normal to the wave crests. The wave kinetic energy 

 associated with the variances in the wave motions shows a strong depth attenu- 

 ation, but this attenuation is not as great as the exponential energy decrease 

 exhibited by a classical trochoidal wave. Integrals of the wave kinetic energy 

 contained in the water column were approximately equal to the estimated potential 

 energy of the waves. 



DD /.A°N^1 1473 



UNCLASSIFIED 



Security Classification 



