37 



M 2 Tidal Current Ellipses 



FIRST 

 DEPLOYMENT 



THIRD 

 DEPLOYMENT 



Figure 3-7. Tidal current ellipses for the M 2 semidiurnal tidal constituent for the fust 

 (left) and third (right) deployment periods. The x and y axes are 

 proportional; current speeds are indicated in cm/s. Both ellipses 

 demonstrate that M 2 tidal currents rotate in a counterclockwise direction at 

 the measurement site. 



Oceanographic Measurements at the Portland Disposal Site during Spring of 1996 



