DATAUBRAK « , 



i Woods Hole OoeanograpWolrfum: 



Unclassified 



SECURITY CLASSIFICATION OF THIS PAGE 



REPORT DOCUMENTATION PAGE 



Form Approved 

 OMB No 07040188 

 Exp Date Jun30, 1986 



la REPORT SECURITY CLASSIFICATION 



Unclassified 



1b. 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-86-6 



5. MONITORING ORGANIZATION REPORT NUMBER(S) 



6a. NAME OF PERFORMING ORGANIZATION 



USAEWES Coastal Engineering 

 Research Center 



6b OFFICE SYMBOL 

 (If applicable) 



WESCV 



7a. NAME OF MONITORING ORGANIZATION 



USAEWES Coastal Engineering- 

 Research Center 



6c. ADDRESS (O'ty, State, and ZIP Code) 



PO Box 631 



Vicksburg, MS 39180-0631 



7b. ADDRESS (O'ty, State, and ZIP Code) 



PO Box 631 



Vicksburg, MS 39180-0631 



8a. NAME OF FUNDING /SPONSORING 

 ORGANIZATION 



US Army Corps of Engineers 



8b OFFICE SYMBOL 



(If applicable) 



DAEN-CWO-R 



9. PROCUREMENT INSTRUMENT IDENTIFICATION NUMBER 



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



Washington, DC 20314-1000 



10. SOURCE OF FUNDING NUMBERS 



11. TITLE (Include Security Classification) 



Migration of Isles Dernieres: Past and Future 



12. PERSONAL AUTHORfS) 



Britsch, Louis D. 



13a. TYPE OF REPORT 



Final report 



13b. TIME COVERED 

 FROM " 



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



August 1986 kk 



16. SUPPLEMENTARY NOTATION 



Available from National Technical Information Service, 

 5285 Port Royal Road, Springfield, VA 22161. 



COSATI CODES 



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



Barrier island complex Longshore drift Subsidence 

 Erosion Migration Tidal inlets 



Isles Dernieres Overwash 



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



Isles Dernieres comprise a barrier island complex located in the southwestern portion 

 of the Mississippi River deltaic plain. The islands formed from reworking of the Early 

 Lafourche deltaic headland deposited from approximately 1,000-300 years B.P. Isles 

 Dernieres have been experiencing a high rate of land loss due to wave attack and rapid 

 subsidence, recently prompting local officials to consider ways of preventing any further 

 deterioration of the coastline. 



The migration of Isles Dernieres is controlled mainly by overwash, tidal currents, 

 longshore drift, and subsidence. Using historic topographic maps, bathymetric surveys, and 

 aerial photographs, quantitative values were placed on each of the factors influencing 

 migration. By comparing the data pertaining to each of the four factors controlling 

 migration, the trend of these factors through time was determined. The analysis indicates 



(.Continued) 



20 DISTRIBUTION /AVAILABILITY OF ABSTRACT 

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□ DTIC USERS 



21 ABSTRACT SECURITY CLASSIFICATION 



Unclassified 



22a. NAME OF RESPONSIBLE INDIVIDUAL 



22b TELEPHONE (Include Area Code) 22c OFFICE SYMBOL 



DD FORM 1473, 84 MAR 



83 APR edition may be used until exhausted 

 All other editions are obsolete 



SECURITY CLASSIFICATION OF THIS PAGE 



Unclassified 



