120 

 100 

 80 

 60 

 40 

 20 

 



DIST FROM SEABED TO MID-STREAMER (cm) 



* 



It 



0.5 1 1.5 



NOZZLE FLUX (g/cm2/min) 



SHOREWARD TRAP 



SEAWARD TRAP 



Figure 17. Consistency run 8609211345-2 



Kraus , Gingerich, and Rosati 1989). However, wave conditions were different, 

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

 SUPERDUCK. The greatest discrepancy in fluxes in Figures 11 through 17 

 occurred at the bottom streamer and was probably a result of small differences 

 in the angle of alignment or elevation, which would cause sediment to pass 

 under the lower lip of the streamer nozzle. 



42. Rosati and Kraus (1989) evaluated trap consistency by comparing the 

 transport rate density and the shape of the vertical flux distribution 

 measured with the shoreward and seaward traps. The longshore transport rate 

 density i is defined as the total immersed weight of transported material 

 crossing a unit length of a shore-normal line per unit time. Consistency 

 ratios, calculated by dividing the lower value of the transport rate density 

 for a particular run (seaward or shoreward trap) by the higher value for a 

 particular run (seaward or shoreward trap) and then multiplying by 100, ranged 

 from 50 to 100 percent for the SUPERDUCK consistency runs. The vertical 

 distributions of sand flux for the consistency data sets were fit with linear, 



43 



