DIST FROM SEABED TO MID-STREAMER (cm) 



0.4 0.6 0.8 



FLUX (g/cm2/min) 



SHOREWARD TRAP 



SEAWARD TRAP 



Figure 57. Run 37-2, SUPERDUCK consistency test (9-21-86) 



depended on trap location. The majority of the DUCK85 consistency runs were 

 conducted in the feeder of a rip current where the flow was steady and strong. 



119. The vertical distributions of sand flux measured with the 

 SUPERDUCK nozzle varied more between the shoreward and seaward traps than was 

 observed with the DUCK85 nozzle. However, wave conditions were different, 

 with clean swell occurring during DUCK85 and more choppy wind waves during 

 SUPERDUCK. Figure 55 shows the run with poorest agreement between seaward and 

 shoreward traps measured during a very low transport condition. 



120. Integration of the measured fluxes through the water column gives 

 the total transport rate density for that trap. Table 11 summarizes the total 

 transport rate density data for the 17 consistency tests conducted both at 

 DUCK85 and SUPERDUCK field data collection programs. Fluxes were adjusted 

 using the values of sand -trapping efficiency determined in Chapter 4. The 

 consistency ratio gives a measure of consistency between the shoreward and 

 seaward traps. If it is assumed that the transport rate is uniform over a 

 distance of approximately 2 to 3 m in a plane normal to the flow, then results 



91 



