Currents in a Strait 



525 



A comparison with the theory presented above can only be achieved by means of 

 current profiles in which the varying effects of changes in pressure and wind are 

 eliminated. A computation of average profiles out of three typical ones for each 

 strait allows a qualitative comparison. Figure 243 shows that excellent agreement can be 

 obtained by suitable choice of the frictional coefficients. A numerical evaluation of 

 equations (XVI. 13) is given in Table 142. The average decline of the physical sea level 

 along the Bosphorus is about 6 cm in 30 km and is greater at the northern end, less at 

 the southern end. Along the 65 km Dardanelles it is only 7 cm; the value of 12 cm in 



170 167 161 153 148 

 Sto).82 .77 69 68 63 61 57 51 



180 



48 45 



38 



29 23 17 3 



14 35 



100 



94 



89 



83 



Stat. 

 75 63 59 30 i5o56 50 39 



35 23/27 19 



10 



Fig. 242. Longitudinal section of the current velocities (cm/sec). Upper picture: Bosporus 

 for N.E. 5 and ^p = 4-5 mm. Lower picture: Dardanelles for N.E. to E. 3^ and /!/> = 3 mm. 



