113. Part V gives an overview of the type of data collected during the 

 DUCK85 and SUPERDUCK field data collection projects and discusses both 

 qualitative observations and quantitative comparisons between closely spaced 

 traps. Tests of various streamer trap nozzles planned for the GL88 data 

 collection project are also presented. 



Overview 



114. During the DUCK85 and SUPERDUCK data collection projects, a total 

 of 45 transport rate data collection runs/tests was made. These runs con- 

 sisted of 15 SSM, 11 TSM, one rip current run, and 17 consistency tests. An 

 example of data collected during an SSM run is presented in Figure 38. Figure 

 39 presents data collected during a TSM run, in which sand transport was 

 sampled at one location through time over approximately a 1-hour period. The 

 data in Figures 38 and 39 have been adjusted using values of sand- trapping 

 efficiencies presented in Part IV, differing from results previously presented 

 (Kraus 1987, Kraus and Dean 1987). 



115. During field use of the trap, qualitative observations of trap and 

 nozzle behavior in the surf zone were made. Scour was observed to appear 

 intermittently at the mouths of the DUCK85 and SUPERDUCK bottom nozzles. No 

 measurements were made of the scour pattern, however. The trap proved to be 

 fairly stable in the surf zone and could be "righted" quickly if tipped during 

 the passage of a wave. The streamers moved with the current and oscillatory 

 motion of the waves and occasionally would wrap around the trap legs if the 

 longshore current speed was not sufficiently great. However, the trap 

 operator could easily keep the streamers untangled and aligned with the 

 direction of the longshore current. Additional discussion of field use of the 

 streamer trap has been presented in Part II. 



Consistency Tests 



116. Tests were conducted with two closely spaced traps placed in the 

 surf zone, collecting sand moving either longshore or offshore in the throat 



80 



