■UNCLASSIFIED 



SECURITY CLASSIFICATION OF THIS PAGE" 



REPORT DOCUMENTATION PAGE 



la REPORT SECURITY CLASSIFICATION 



UNCLASSIFIED 



lb RESTRICTIVE MARKINGS 



2a 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-1167-01 



S 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) 



8a NAME OF FUNDING/SPONSORING 

 ORGANIZATION 



Naval Sea Systems Command 



8b OFFICE SYMBOL 

 (If applicable) 



9 PROCUREMENT INSTRUMENT IDENTIFICATION NUMBER 



8c ADDRESS (City. State, and ZIP Code) 

 Washington, D.C. 20362 



10 SOURCE OF FUNDING NUMBERS 



11 TITLE (include Security Classification) 

 DIRECTIONAL WAVE MEASUREMENT AND ANALYSIS 



12 PERSONAL AUTHOR(S) 



Ronald J. Lai and Robert J. Bachman 



13a TYPE OF REPORT 



Final 



13b TIME COVERED 

 FROM TO 



14 DATE OF REPORT (Year. Month, Day) 15 PAGE COUNT 



44 



1985 September 



16 SUPPLEMENTARY NOTATION 



COSATI CODES 



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

 Directional Waves 

 Ocean Wave Analysis 



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



A directional wave analysis program has been developed to analyze the measured 

 directional wave data from an ENDECO Wave-Track buoy. Due to the nature of the buoy, the 

 direction components must be adjusted in order to apply a conventional wave slope analysis. 

 The choice of a Wave-Track buoy stems from the requirement of a light-weight, easy to handle 

 directional sensing wave buoy. The results can be used to validate the directional spread 

 of wave energy produced by the Spectral Ocean Wave Model (SOWM) . Also, the resulting 

 directional spread of energy, as produced by the buoy, may now be used with ship motions to 

 produce ship response amplitude operator (RAO's), or combined with ship RAO's to estimate 

 ship motions. 



The equations are developed to account for buoy motions in a current and in shallow 

 water. Although electronic phase shifts have been adjusted, it is still necessary to develoj 

 some analytical solution to compensate for hydrodynamic responses and phase shifts. 



(Continued on reverse side) 



20 DiSTRlBUTlON/AVAILABILITY OF ABSTRACT 

 D UNCLASSIFIED/UNLIMITED O SAME AS RPT 



Ddtic users 



21 ABSTRACT SECURITY CLASSIFICATION 



UNCLASSIFIED 



22a NAME OF RESPONSIBLE INDIVIDUAL 



Robert J. Bachman 



22b TELEPHONE (Include Area Code) 

 202-227-1817 



22c OFFICE SYMBOL 



Cote 1561 



DO FORM 1473, 84 mar 



83 APR edition may be used until exhausted 

 All other editions are obsolete 



SECURITY CLASSIFICATION OF THIS PAGE 



