Unclassified 



SECURITY CLASSIFICATION OF THIS PAGE (When Dale 







REPORT DOCUMENTATION PAGE 



READ INSTRUCTIONS 

 BEFORE COMPLETING FORM 



1. REPORT NUMBER 



TN-1435 



2 GOVT ACCESSION NO. 



DN344010 



3. RECIPIENT'S CATALOG NUMBER 



4. TITLE (end Subtitle) 



EXPENDABLE DOPPLER PENETROMETER: 

 INTERIM REPORT 



5. TYPE OF REPORT ft PERIOD COVERED 



Not final; Dec 1973 - Apr 1975 



6. ' PER FORMING ORG. REPORT NUMBER 



R. M. Beard 



8. CONTRACT OR GRANT NUMBERfsJ 



9. PERFORMING ORGANIZATION N»ME AND ADDRESS 



CIVIL ENGINEERING LABORATORY 

 Naval Construction Battalion Center 

 Port Hueneme, California 93043 



10. PROGRAM ELEMENT PROJECT. TASK 

 AREA a WORK UNIT NUMBERS 



62759N, 



YF52. 556.999.01. 102 



11. CONTROLLING OFFICE NAME AND ADDRESS 



Naval Facilities Engineering Command 

 Alexandria, Virginia 223 32 



12. REPORT DATE 



April 1976 



13 NUMBER OF PAGES 



21 



11 MONITORING AGENCY NAME S AOORESSCif different liom Controlling Ottire) 



15. SECURITY CLASS, (ol Ihis report) 



Unclassified 



15a. DECLASSIFICATION DOWNGRADING 

 SCHEDULE 



16. DISTRIBUTION STATEMENT (ul this Report) 



Approved for public release; distribution unlimited. 



17. DISTRIBUTION STATEMENT (of the abstract entered in Block 20, it ditterent Irom Report) 



18. SUPPLEMENTARY NOTES 



19. KEY WORDS (Continue on reverse side if necessary and identity bv block number) 



Dynamic penetrometer; Doppler Effect Instrumentation; acoustic data; soil strength; 

 ocean engineering; expendable; free-fall. 



20. ABSTRACT (-Continue on reverse side II necessary end identity by block number) 



An expendable penetrometer using the Doppler principle has been developed to 

 expediently test seafloor soils at water depths to 20,000 feet. The velocity of the penetrom- 

 eter is measured as it penetrates seafloor soils; from the velocity record, soil penetrability 

 and an estimate of soil strength are available. The penetrometer weighs 365 pounds, is 10 feet 

 long, is 3-1/2 inches in diameter, and is easily deployed from a ship. Initial testing indicates 

 that the concept of a Doppler instrumentation system is workable, that penetration can be 



0D 1 jan 73 1473 EDITION OF I NOV 65 IS OBSOLETE 



Unclassified 



SECURITY CL 



MBL/WHOI 



D3D1 QDMQ207 1 



