UNCLASSIFIED 



Security Classification 



DOCUMENT CONTROL DATA R&D 



(Security classification ot title, body ol abstract and Indexing annotation must be entered when the overall report Is classilled) 



ORIGIN A Tl 



activity (Corporate author) 



Coastal Engineering Research Center (CERC) 

 Corps of Engineers , Department of the Army 

 Washington, D. C. 20016 



2*. REPORT SECURITY CLASSIFICATION 



UNCLASSIFIED 



26. CROUP 



3. REPORT TITLE 



TRACING SAND MOVEMENT IN THE LITTORAL ZONE: PROGRESS IN THE RADIOISOTOPIC SAND 

 TRACER (RIST) STUDY - July 1968- February 1969 



4. DESCRIPTIVE NOTES (Type ol report and inclusive dates) 



8. AUTHOR(S) (First name, i 



David B. Duane 



ilddle Initial, las 



a. REPORT DATE 



August 1970 



7a. TOTAL NO. OF PAGES 



52 



76. NO. OF REFS 



25 



8J. CONTRACT OR GRANT NO. 



AT(49-ll)-2988 between Atomic Energy 

 b. project no. Commission and Coastal 

 Engrg Research Center 



a. ORIGINATOR'S REPORT NUMBERIS) 



Miscellaneous Paper 4-70 



10. DISTRIBUTION STATEMENT 



This document has been approved for public release and sale; its distribution 

 is unlimited. 



II. SUPPLEMENTARY NOTES 



12. SPONSORING MILITARY ACTIVITY 



3. ABSTRACT 



Tagging procedures, instrumentation, field surveys and data handling techniques 

 have been developed by the radioisotopic sand tracing study for the collection and 

 analysis of over 12,000 bits of information per hour over a survey track of about 

 18,000 feet. Data obtained can be considered as nearly synoptic observations of 

 sediment transport in a single environmental zone or in adjacent beach, surf and 

 offshore zones. Experiments at Surf, Point Conception, Point Mugu, and Oceanside, 

 California, used sand tagged with isotopes of xenon or gold. Data from studies in 

 beach areas unmodified by littoral barriers indicate that the alongshore velocity 

 of sediment transport differs from zone to zone. Transport seaward of peaking, 

 breaking waves is less than transport on the beach face which is less than transport 

 in the plunge and surf zone. Zone dimensions change with waves and tides. Tracing 

 surveys confined to the foreshore or offshore zones produce data only partly in- 

 dicative of transport in the zone of immediate concern to coastal engineers. Studies 

 conducted at the site of shore structures indicate the RIST system can provide data 

 useful in understanding the effect of such structures on sediment transport. 



DD 



.1473 



UNCLASSIFIED 



Security Claaaiflcation 



