Unclassified 



SECURITY CLASSIFICATION OF THIS PAGE 



REPORT DOCUMENTATION PAGE 



Form Approved 

 OMB No. 0704-01 88 



1a. 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-89-11 



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) 



3909 Halls Ferry Road 

 Vicksburg, MS 39180-6199 



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



8a. NAME OF FUNDING/SPONSORING 

 ORGANIZATION 



US Army Corps of Engineers 



8b. OFFICE SYMBOL 

 (If applicable) 



9 PROCUREMENT INSTRUMENT IDENTIFICATION NUMBER 



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



Washington, DC 20314-1000 



10. SOURCE OF FUNDING NUMBERS 



1 1 . TITLE (Include Security Classification) 



Development of a Portable Sand Trap for Use in the Nearshore 



12. PERSONAL AUTHOR(S) 



Rosati, Julie Dean; Kraus, Nicholas C. 



13a. TYPE OF REPORT 

 Final report 



13b. TIME COVERED 

 FROM " 



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

 September 1989 181 



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) 

 See reverse. 



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



This study presents an evaluation of and improvement upon the hydraulic and sand- 

 trapping characteristics of the streamer trap, a sand trap developed for use in the near- 

 shore zone. Twenty-three streamer trap nozzles were evaluated in laboratory hydraulic 

 efficiency tests; three nozzles with near-optimum hydraulic behavior were further evaluated 

 in laboratory sand-trapping efficiency tests. A comparison of measurements made with two 

 closely spaced traps in the field was conducted as an indication of consistency. The 

 Helley-Smith sampler, a popular riverine sediment trap reported in the literature, was 

 also tested in the laboratory for comparison. 



Laboratory testing indicated that the nozzle previously used in the DUCK85 field 

 data collection project performed well at an off-bed elevation; however, sand-trapping 

 efficiency at the bed was low, with significant scour developing during a 5-min testing 



(Continued) 



20. DISTRIBUTION /AVAILABILITY OF ABSTRACT 

 ED 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. JUN 86 



Previous editions are obsolete. 



SECURITY CLASSIFICATION OF THIS PAGE 

 Unclassified 



MBL/WHOI 



0301 0011255 3 



