fluorescent tracing in the marine environment for several years. Results 

 of recent studies, carried out on the east coast of Florida, are sum- 

 marized by Stuiver and Purpura (1969). Komar (1969) reports on results 

 of the use of fluorescent tracers on two beaches in southern California. 

 McArthur (1969) discusses sand movement related to beach topography near 

 Panama City, Florida, as indicated by fluorescent tagged sand. Some of 

 these investigations are discussed in more detail in Section IV. 



2. Scope and Objectives 



The RIST Study is a multiagency program directed by CERC to 

 develop techniques and technology to utilize radioactive-tracer methods 

 for research into sand movement and littoral processes. Detailed dis- 

 cussion of the scope and objectives of the overall plan were presented 

 previously (Duane and Judge, 1969). Within the comprehensive framework 

 of the program, the scope and objectives of these recent studies at 

 Surf, California (Figure 1), follow: 



(a) Compare patterns of sediment movement observed in radio- 

 active sand tracer tests in the Shore Processes Test Basin (SPTB) , 

 (Taney, 1963; Duane and Judge, 1969) with patterns observed on a 

 natural sand beach; 



(b) Observe nearly synoptical patterns of sediment movement on 

 the beach face, in the inshore and offshore zones; 



(c) Compare results obtained using sand tagged with xenon- 133 

 with those obtained using sand tagged with gold 198-199; 



(d) Field test the upgraded data acquisition system; and 



(e) Obtain a comparison of littoral transport under different 

 wave conditions by conducting tests during different seasons . 



To obtain initial "data for the program objectives, two experiments 

 were conducted during the fall of 1968, The first series used sand 

 tagged with xenon-133 placed at two different times as a simulated line 

 source extending from the beach face through the surf zone. This series 

 of injections and subsequent tracing operations were from 25 to 29 

 September 1968. The second series was conducted using sand tagged with 

 gold 198-199. To replicate the preceding xenon experiments, gold-tagged 

 sand was also placed as a simulated line source extending from the beach 

 face through the surf zone. Injection was made on 4 and 5 October 1968, 

 and dispersion monitored through 9 October 1968. 



During February 1969, another field test using gold 198-199 was 

 conducted at Surf. Two simultaneous line injections were made extending 

 from -6 to -14 feet mean lower low water and -21 to -27 feet mean lower 

 low water. Equipment problems and high waves precluded offshore opera- 

 tions; tracing was confined to the 'beach. 



