524 



Currents in a Strait 



Fig. 241. Longitudinal section of the density at. Upper picture: through the Bosporus in 

 Sept/Oct. 1917. Lower picture: through the Dardanelles June/July 1918 (according to 



Moller). 



narrows and the standing vortices increase in extent. During south-west winds the 

 surface current becomes weaker and broader and the lower current is accelerated. 

 Figure 242 gives a longitudinal section through both straits showing the currents during 

 a period with stronger north-east winds with a large pressure gradient towards the 

 south-west. This wind influence produces a strong asymmetry in the current structure. 

 For a period with a south-west wind the current conditions are aflTected in the opposite 

 way. These flow conditions, however, no longer represent a stationary state. 



