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la REPORT SECURITY CLASSIFICATION 



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1b RESTRICTIVE MARKINGS 



2* SECURITY CLASSIFICATION AUTHORITY 



2b DECLASSIFICATION /DOWNGRADING SCHEDULE 



3 DISTRIBUTION/AVAILABILITY OF REPORT 



APPROVED FOR PUBLIC RELEASE: DISTRIBUTION 

 UNLIMITED 



4 PERFORMING ORGANIZATION REPORT NUMBER(S) 



DTNSRDC/SPD-1179-01 



5 MONITORING ORGANIZATION REPORT NUMBER(S) 



6a NAME OF PERFORMING ORGANIZATION 

 David W. Taylor Naval Ship 

 Research & Development Center 



6b OFFICE SYMBOL 

 (If applicable) 



1561 



7a NAME OF MONITORING ORGANIZATION 



6c ADDRESS (City, State, and ZIP Code) 

 Bethesda, Maryland 20084-5000 



7b ADDRESS (City. State, and ZIP Code) 



Ha NAME OF FUNDING / SPONSORING 

 ORGANIZATION 



Naval Sea Systems Command 



8b OFFICE SYMBOL 

 (If applicable) 



9 PROCUREMENT INSTRUMENT IDENTIFICATION NUMBER 



Be ADDRESS (City. State, and ZIP Code) 



Washington, D.C. 20362 



10 SOURCE OF FUNDING NUMBERS 



PROGRAM 

 ELEMENT NO 



62759N 



PROJECT 

 NO 



TASK 

 NO 



SF 59-557 



WORK UNIT 

 ACCESSION NO 



DN1780231 



II TITLE (Include Security Classification) 

 DIRECTIONAL WAVE MEASUREMENTS DURING THE HR. 



MS. TYDEMAN SEA TRIAL 



12 PERSONAL AUTHOR(S) 



Robert J. Bachman and Edward W. Foley 



1?a TYPf OF REPORT 



Final 



13b TIME COVERED 

 FROM TO 



14 DATE OF REPORT (Year, Month, Day) |1 5 PAGE COUNT 



1985 December 44 



'6 SUPPLEMENTARY NOTATION 



COSATI CODES 



PIELP 



_0IL 



_Q3_ 



18 SUBJECT TERMS (Continue on reverse if necessary and identify by block number) 



Directional Waves 

 Wave Buoy Comparisons 



19 ABSTRACT (Continue on reverse if necessary and identify by block number) 



Trials were conducted in May 1982 aboard the Dutch oceanographic research ship Hr. Ms. 

 TYDEMAN to compare the performance of three wave buoys. These were a disposable buoy 

 designed and built by Delft University of Technology, a WAVEC buoy under development by the 

 Datawell Corporation, and an ENDECO Corporation Wave-Track buoy owned by the David Taylor 

 Naval Ship Research and Development Center. The disposable buoy provided energy spectra, 

 while the other two buoys provided energy spectra and wave directionalities. The time 

 histories of the significant wave heights and modal wave periods of the WAVEC and the 

 Wave-Track buoys generally agree throughout the experiment. The energy spectra, mean wave 

 directions, and spreading angles are also presented for most of the runs measured by the 

 WAVEC and the Wave-Track buoys. The spectra of the two buoys are similar, with the WAVEC 

 buoy showing higher peaks in a majority of cases. The mean directions basically compare 

 well for wave frequencies above 0.11 hertz. Wave-Track mean directions below this range 



CCnni-iniipH on reverse side) 



20 DISTRIBUTION/AVAILABILITY OF ABSTRACT 

 □ UNCLASSIFIED/UNLIMITED ED SAME AS RPT 



□ DTIC USERS 



'2a NAME OF RESPONSIBLE INDIVIDUAL 



Robert J. Bachman 



21 ABSTRACT SECURITY CLASSIFICATION 



Unclassified ■ 



22b TELEPHONE (Include AreaCode) j 22c OFFICE SYMBOL 



202/227-1817 



Code 1561 



DD FORM 1473, 84 mar 



83 APR edition may be used until exhausted 

 All other editions are obsolete 



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