Unclassified 



SECURITY CLASSIFICATION OF THIS PAGE 



REPORT DOCUMENTATION PAGE 



Form Approved 

 OMB No 07040188 

 Exp Date Jun30, 1986 



1a. REPORT SECURITY CLASSIFICATION 



Unclassified 



1b. RESTRICTIVE MARKINGS 



2a SECURITY CLASSIFICATION AUTHORITY 



2b DECLASSIFICATION /DOWNGRADING SCHEDULE 



DISTRIBUTION /AVAILABILITY OF REPORT 



Approved for public release; 

 distribution unlimited 



4. PERFORMING ORGANIZATION REPORT NUMBER(S) 



Technical Report CERC-86-8 



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 (G'ty, State, and ZIP Code) 



PO Box 631 



Vicksburg, MS 39180-0631 



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



a. NAME OF FUNDING /SPONSORING 



organization US Army 

 Engineer Division, New England 



8b. OFFICE SYMBOL 

 (If applicable) 



9. PROCUREMENT INSTRUMENT IDENTIFICATION NUMBER 



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



424 Trapelo Road 

 Waltham, MA 02254-9149 



10. SOURCE OF FUNDING NUMBERS 



1 1 . TITLE (Include Security Classification) 



Frequency of Coastal Flooding at Roughans Point, Broad Sound, Lynn Harbor, and the 

 Saugus-Pines River System 



12. PERSONAL AUTHOR(S) 



Hardy, Thomas A., Crawford, Peter L. 



13a. TYPE OF REPORT 



Final report 



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



FROM May 1984 To Dec 198 5 September 1 986 



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) 



Coastal flooding Wave overtopping Storm surge 

 Flood frequency Stage-frequency 



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



This report describes the establishment of frequency curves for water levels caused by 

 the combination of tide, storm surge, and waves for a coastal area just north of Boston. 

 The project procedure involves the conjunctive use of five modeling components, including 

 numerical storm surge, numerical wave propagation, physical wave overtopping, flood routing, 

 and probability models. 



At Roughans Point where flooding is caused by the overtopping of seawalls by storm 

 waves, all five models were necessary. Multiple combinations of possible seawall-revetment 

 structures were modeled. Major differences among the combinations were evident at the lower 

 return periods with the combinations of a wide berm revetment and a cap on the existing sea- 

 wall for the east wall of Roughans Point providing the greatest protection. At higher 

 return periods the protection differential offered by the various structure combinations 

 tended to diminish. For still-water levels and wave conditions of a Standard Project 



(Continued) 



20 DISTRIBUTION /AVAILABILITY OF ABSTRACT 

 GQ UNCLASSIFIED/UNLIMITED □ SAME AS RPT 



□ 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 



MBL/WHOI 



D Q3D1 OOIIZSM 1 



