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Morphology of the Bosphorus

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Mavi Boncuk |

The Palaeozoic-Upper Cretaceous basement palaeomorphology of the Bosphorus (the Strait of Istanbul) bears the evidence of a valley of a palaeostream running to the Black Sea in the north, a palaeobasin deeper than —160 m opening to the Sea of Marmara in the south, and a barrier between these two features. This suggest that the northern part of the Bosphorus was formed mainly by fluvial activity, whereas the southern part developed as a basin by faulting. The recent sediment thickness exceeds 130 m in the basin, indicating that the southern part of the Bosporus was once essentially depositional rather than an erosional.


The present form of the Bosporus was established in Holocene time by the connection of the basin in the south with the stream in the north. The barrier and the stream valley in the north have been deepened by erosion and faulting to form a strait connecting the Black Sea and the Mediterranean.




see also: 

Flow, water mass changes, and hydraulics in the Bosphorus

First published: 07 March 2002
 
"Using average sections along the Bosphorus taken in September 1994 with a loosely tethered profiler and an acoustic Doppler current profiler, Gregg et al. [1999] found the exchange flow between the Sea of Marmara and the Black Sea to be quasi-steady but far from satisfying the hydraulic control conditions for two-layered flows."



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