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 SECURITY CLASSIFICATION OP THIS PAGE 



REPORT DOCUMENTATION PAGE 



Form Approved 

 0MB 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(5) 

 Technical Report CERC-89-9 



S. 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) 



3909 Halls Ferry Road 

 Vicksburg, MS 39180-6199 



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



8a. NAME OF FUNDING /SPONSORING 

 ORGANIZATION 

 US Array Corps of Engineers 



8b. OFFICE SYMBOL 

 (If applicable) 



9. PROCUREMENT INSTRUMENT IDENTIFICATION NUMBER 



8c. ADDRESS fC/fy, State, and ZIP Code) 



Washington, DC 20314-1000 



10. SOURCE OF FUNDING NUMBERS 



WORK UNIT 

 ACCESSION NO. 



34321 



1 1 . TITLE (Include Security Classification) 



SBEACH: Numerical Model for Simulating Storm-Induced Beach Change; Report 1; 

 Foundation and Model Development 



Empirical 



12. PERSONAL AUTHOR(S) 



Larson, Magnus; Kraus, Nicholas C. 



13a. TYPE OF REPORT 

 Report 1 of a series 



13b. TIME COVERED 14 DATE OF REPORT (Year, Month, Day) 15. PAGE COUNT 



FROMAi.cr «ft TO Mai- «9 I July 1989 I 267 



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) 



Accretion Cross-shore sand transport Longshore bars 

 Beach erosion Dune erosion Numerical models 

 Berms Erosion Storm erosion 



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



A two-dimensional numerical model is presented for calculating dune and beach 

 erosion produced by storm waves and water levels. The model is empirically based and was 

 first developed from a large data set of net cross-shore sand transport rates and geomorphic 

 change observed in large wave tanks, then verified using high-quality field data. The model 

 is aimed to reproduce macroscale features of the beach profile, with focus on the formation 

 and movement of longshore bars. The ultimate goal of the modeling effort is prediction of 

 storm- induced beach erosion and post-storm recovery. Bars are simulated satisfactorily, but 

 berm processes are less well reproduced, due in part to a lack of data for defining accre- 

 tionary wave and profile processes. A new criterion is developed for predicting erosion 

 and accretion, and the model uses this criterion to calculate net sand transport rates in 

 four regions of the nearshore extending from deep water to the limit of wave runup. Wave 

 height and setup across the profile are calculated to obtain the net cross-shore sand 



(Continued) 



20. DISTRIBUTION /AVAILABILITY OF ABSTRACT 

 El UNCLASSIFIED/UNLIMITED D SAME AS RPT. 



D DTIC USERS 



21. ABSTRACT SECURITY CLASSIFICATION 

 Unclassified 



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22b TELEPHONE f/nc/ude Area Code) 22c. OFFICE SYMBOL 



DO Form 1473, JUN 86 



Previous editions are obsolete. 



SECURITY CLASSIFICATION OF THIS PAGE 



Unclassified 



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