sediment concentration and ECM velocity data are shown in Figures 15 and 16, 

 respectively, for a run starting at 1504 hours on 16 January 1992. In Figure 16 

 the V velocity (upper plot) is in the longshore direction; U velocity is 

 cross-shore. This sensor was at an elevation of 17.5 cm above the bed. 



80 



m 40 



150 



S 100 



50 



01161504.cr3 



Jii 



1000 



2000 3000 



Time, sec 



01161504.cr3 



4000 



5000 



yLUjJliLjL ilili mA^ 



Jd^iiJu 



1000 



2000 3000 



Time, sec 



4000 



5000 



Figure 15. Example of platform OBS output on 16 January 1992. Top and 

 bottom sensors are 27.5 and 12.5 cm above the bed, respectively (from 

 White1992) 



The concentrations, velocities, bottom location, and surface location data 

 were combined, as shown in Figure 17, to produce a vertically integrated 

 sediment transport rate value for each 0.2-sec time-step in the data record. In 

 Figure 17, c = concentration, v = long-shore velocity, and z = vertical 

 distance. These values were then averaged to produce transport rate values 

 provided in Appendix C, Table CI. 



32 



Chapter 4 Data Observations and Analyses 



