







Table 



11 













Comparison 



of Transport 



Rate 



Densi 



tv Measured 



with 











Two 



Closely Spaced Traps 













Transport Rate 



Density 



, e/Ccm/min) 



Consistency 



Run No. 



Date 



Nozzle 



Shoreward 



Trap 



Seaward Trap 



Ratio* % 



2-1 



9-4-85 



DUCK85 





21.8 









32.1 





68 



2-2 



9-4-85 



" 





94.1 









166.7 





57 



1 



9-7-85 



" 





112.5 









215.9 





52 



4 



9-7-85 



" 





16.4 









9.5 





58 



5 



9-9-85 



" 





35.4 









37.5 





94 



6 



9-9-85 



" 





69.6 









85.5 





81 



7 



9-9-85 



" 





72.8 









78.7 





93 



8 



9-9-85 



" 





58.3 









35.3 





61 



9 



9-9-85 



" 





26.5 









16.0 





60 



10 



9-9-85 



11 





26.4 









46.7 





57 



23 



9-16-86 



SUPERDUCK 



14.2 









11.9 





84 



24 



9-16-86 



" 





7.8 









9.6 





81 



34-1 



9-20-86 



" 





19.2 









8.6 





45 



34-2 



9-20-86 



" 





18.9 









17.4 





92 



35 



9-21-86 



" 





1.4 









1.7 





82 



37-1 



9-21-86 



" 





4.1 









4.2 





98 



37-2 



9-21-86 







5.5 









9.5 





58 



"Consistency Ratio %," a measure of consistency, is 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. 



presented in Table 11 indicate a consistency for the DUCK85 nozzle from 50 to 

 90 percent and a consistency for the SUPERDUCK nozzle from 50 to 100 percent 

 (values rounded off to first significant number) . 



121. Trap reproducibility can also be quantified by mathematically 

 describing the vertical flux. Values of sand flux corresponding to a particu- 

 lar elevation were represented with linear, exponential, and power law least 

 square fits. The equations were developed using the distance from the seabed 

 to midstreamer Z as the independent variable and sand flux F as the 

 dependent variable as follows: 



Linear: F = aZ + b (23) 



Exponential: F = ae Zb (24) 



Power: F = aZ b (25) 



92 



