13 - 



about movements which sre further controlled by the rotj^tlon of the 

 earth. As a result of the relationship between the distribution of 

 density and wqter movements, certain principals have been derived 

 to nssist in the hydrodynamic'^l analysis of water masses. One 

 elementary principle st-^tes thnt if one f-^ces in such a direction 

 that the lip-hter waters ore on the right h^^nd then one is looking in 

 the direction in which the current is flowing. In the Bay of Fundy 

 region the enormous tides result in large and complicated current 

 systems. However, for purposes of hydrographical analysis we are 

 interested only in the resultant movements, or circulation, and by 

 making the following basic assumptions we are able to arrive at a 

 simple and clear method for evaluating resultant water movements: 



(a) The net amount of salt water Introduced and removed from 

 the Bay of Pundy is, during a complete tidal cycle, equal 

 to zero. 



(b ) The outflow of water from the B?ty of Fundy is by necessity 

 greater than the inflow of salt water due to the intro- 

 duction of large quantities of fresh v/ater from the various 

 drainage basin. 



(c) The outflowing waters are less saline than the inflowing 

 due to the mixing of the waters that must occur in any 

 tidal region. 



(d) The lighter water is on the right of the direction of the 

 current . 



It therefore follows that, in general, the resultant outflow keeps to 

 the surface layers while the Inflov/ing waters keep to the lower levels 

 Also, the lighter waters are to be found proceeding fromi the head of 



