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I. REPORT NUMBER 



TP 80-3 



2. GOVT ACCESSION NO 



3. RECIPIENT'S CATALOG NUMBER 



4. TITLE (and Subtitle) 



ESTIMATING NEARSHORE CONDITIONS FOR 

 IRREGULAR WAVES 



5. TYPE OF REPORT 4 PERIOD COVERED 



Technical Paper 



6. PERFORMING ORG. REPORT NUMBER 



7. AUTHORfs) 



William N. Seelig 

 John P. Ahrens 



8. CONTRACT OR GRANT NUMBERfe; 



9. PERFORMING ORGANIZATION NAME AND ADDRESS 



Department of the Army 



Coastal Engineering Research Center (CERRE-CS) 



Kingman Building, Fort Belvoir, Virginia 22060 



F31538 



11. CONTROLLING OFFICE NAME AND ADDRESS 



Department of the Army 



Coastal Engineering Research Center 



Kingman Building, Fort Belvoir, Virginia 22060 



12. REPORT DATE 



June 1980 



13. NUMBER OF PAGE'S 



47 



14. MONITORING AGENCY NAME & ADDRESSf/f different from Controlling Office) 



15. SECURITY CLASS, (of this report) 



UNCLASSIFIED 



16. DISTRIBUTION STATEMENT (of this Report) 



Approved for public release; distribution unlimited. 



17. DISTRIBUTION STATEMENT (of the abstract entered in Block 20, if different from Report) 



18. SUPPLEMENTARY NOTES 



19. KEY WORDS (Continue 



averse side if l 



aaary and Identify by block i 



CERC Field Research Facility 

 Design curves 

 Irregular waves 



nber) 



Nearshore conditions 



Wave height 



Waves 



20. ABSTRACT f*Gaxzt£oue cm reverse ofrfi* ft mtcaaaary and. identify by block number) 



Methods for estimating nearshore irregular wave conditions for the case of 

 continuously shallowing bottom contours, given the bottom slope and offshore 

 wave characteristics, are presented. The methods are based on the work of Goda 

 (1975a, 1975b) and Goda, Takayama, and Suzuki (1978) . A sensitivity analysis is 

 performed to show the influence of various input parameters on predicted near- 

 shore significant wave height. The methods are applied to the nearshore region 

 at the CERC Field Research Facility at Duck, North Carolina, and results are 

 compared to observed nearshore wave height changes measured at the facility. 

 Design curves are included. 





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