Volume of section A 2,389x10' cu. ft. 



Volume of section B 2,254x10' cu. ft. 



These and the above net flo>v velocities give:* 



Q^ = 198xl0'7 cu. ft. 

 Qg = 177x10'^ cu. ft. 



The exchange ratios are: r = *_ =0.08 



A 



ro= 9b =0.078, 

 ^ B 



and 



yi =2389X10' (0.35)"" 

 y2 =2254x10' (0.35)" 



The plot of these curves and their sum (yj + y^) are shown in Figure 7, 



PART II 



Embayments (R = 0) 



When the river water entering a bay is nil or insufficient to cause 

 the salinity of the bay to differ from that of the adjacent sea water, 

 then the circulation pattern of Figure 1 does not exist. In Figure 8A 

 the salinity of a bay at low water is supposed to be equal to that of 

 the adjacent sea volume, P. 



Let- the volume P be equal to the tidal prism volume of the bay. 

 Suppose that the volume of the bay is contaminated, at high water. 

 Then Figure 8A represents the situation at the following low water. 

 It is assumed that the contaminant which is ejected into the sea 

 during any ebb tide is carried away from the bay entrauice before the 

 following flood tide begins. 



Now let volume P push bodily into the bay displacing the volumes 

 Pi = P2 = P3, etc., all of which are numerically equal to P. We now 

 have a second high tide situation. Figure 8B. In Figure 8A the small 



*Flood and ebb tide intervals were taken as 6 hours each. 



10 



