concluded that beach sand transported offshore becomes trapped in deep 

 interreef troughs and cannot be returned to the beaches naturally. 

 Raymond noted anomalously high percentages of fine quartz sand in the 

 vicinity of Port Everglades and Hillsboro Inlets. 



Sand samples, collected by the U.S. Army Engineer District, Jackson- 

 ville (1968) in the vicinity of the Jupiter site and analyzed using siev- 

 ing techniques, had median diameters ranging from 0.42 millimeter (1.25 

 phi) on the dune to 2.20 millimeters (-1.14 phi) at -6 feet MLW, and 

 rapidly decreasing farther offshore. Sajnples taken from offshore by the 

 University of Florida (1969) indicated that the borrow material was very 

 poorly sorted and had a larger median grain diameter than the natural 

 material on the beach (0.56 versus 0.29 millimeter, 0.83 versus 1.74 phi). 



A set of surface samples collected during this study at Boca Raton 

 and analyzed on the CERC Rapid Sediment Analyzer (RSA) (Duane and 

 Meisburger, 1969, p. 2) had median diameters ranging from 0.30 millimeter 

 (1.71 phi) at the toe of the dune to 1.15 millimeters (-0.20 phi) on the 

 barm, and 0.33 millimeter (1.60 phi) at -13 feet (-4.0 meters) MSL. 

 Samples from the beach face were generally coarser, with median diameters 

 of 0.8 to 1.0 millimeter (0.32 to 0.0 phi). Shell content, as determined 

 by acid solubility, was 40 to 65 percent. Surface samples collected from 

 Hollywood and analyzed on the RSA had median diameters ranging from 0.27 

 to 0.92 millimeter (1.89 to 0.12 phi). Dune samples had the least varia- 

 bility in median diameters (0.42 to 0.51 millimeter, 1.25 to 0.97 phi); 

 foreshore samples had the greatest variability (0.27 to 0.92 millimeter). 

 In general, samples from all three sites were well sorted to moderately 

 well sorted (Folk, 1965). A tabulation of sand size for samples collected 

 during this study is in Appendix A. 



II. PROCEDURE 

 1. Littoral Parameters . 



Littoral environment observations, based on a procedure by Berg (1968) 

 and Balsillie and Bruno (1973), were made once a week at Jupiter and 

 Hollywood and up to five times a week at Boca Raton. The surf observa- 

 tions included visual estimates of breaker height and period, the direc- 

 tion from which the breakers were coming, and the type of breaker (i.e., 

 spilling, plunging, surging, or spill-plunge) . Wind observations in- 

 cluded the' measurement of windspeed with a hand-held Florite anemometer 

 (Fig. 13) , and the determination of the direction from which the wind was 



Figure 13. Hand-held anemometer. 

 27 



