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SECURITY CLASSIFICATION OF THIS PAGE 



REPORT DOCUMENTATION PAGE 



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 OMB No. 0704-0188 



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) 

 Technical Report CERC-89-8 



5. MONITORING ORGANIZATION REPORT NUMBER(S) 



6a. NAME OF PERFORMING ORGANIZATION 

 USAEWES, Coastal 

 Engineering Research Center 



6b. OFFICE SYMBOL 

 (If applicable) 



7a. NAME OF MONITORING ORGANIZATION 



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



P.O. Box 631 



Vicksburg, MS 39181-0631 



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



8a. NAME OF FUNDING /SPONSORING 

 ORGANIZATION 



US Army Corps of Engineers 



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 (If applicable) 



9. PROCUREMENT INSTRUMENT IDENTIFICATION NUMBER 



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



Washington, DC 20314-1000 



10. SOURCE OF FUNDING NUMBERS 



32430 



1 1 . TITLE (Include Security Classification) 



Infragravity Energy and Its Implications in Nearshore Sediment Transport and Sandbar 

 Dynamics 



12. PERSONAL AUTHOR(S) 



Oltman-Shay, Joan; Hathaway, Kent 



13a. TYPE OF REPORT 

 Final report 



13b. TIME COVERED 

 FROM 



TO 



14. DATE OF REPORT (Year, Month, Day) 

 July 1989 (Revised) 



IS. PAGE COUNT 



34 



16. SUPPLEMENTARY NOTATION 



Available from National Technical Information Service, 5285 Port Royal Road, 

 Springfield, VA 22161 __^_ 



17. 



COSATI CODES 



FIELD 



GROUP 



SUB-GROUP 



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

 Edge waves Runup 



Infragravity waves Sediment transport 



Nearshore morphology 



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



This report presents a tutorial on infragravity motions in the nearshore zone with 

 particular attention given to the influence of infragravity motions on sediment transport 

 and runup. This ubiquitous low-frequency wave motion, with periods from 30 sec to several 

 minutes, often contributes a substantial portion to the surf zone energy especially during 

 storms when erosion and sediment transport are most acute. The historical development of 

 infragravity wave models and research is discussed as well as infragravity wave dynamics 

 and theoretical generation mechanisms. Field studies identifying infragravity motions are 

 discussed, including the various methods used to measure this complex phenomenon. Consid- 

 erations for future research including studies to monitor the nearshore morphology, inci- 

 dent wind waves and swell, and infragravity waves are also discussed. These studies would 

 help to understand the link between infragravity energy and nearshore processes (e.g., sed- 

 iment transport, sandbar generation, beach cusps and other periodic morphologies, rip cur- 

 rents, and runup). An annotated bibliography is included as an appendix. 



20 DISTRIBUTION /AVAILABILITY OF ABSTRACT 

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21. ABSTRACT SECURITY CLASSIFICATION 

 Unclassified 



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OD Form 1473. JUN 86 



Previous editions are obsolete. 



SECURITY CLASSIFICATION OF THIS PAGE 



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