Gilgamesh lived 2700-2500 BC.
The Black Sea flood was about 5600 BC.
This is a long time for oral tradition to survive, I think; however, people dated everything before and after the flood just as we now date everything before and after Jesus. I don't know how long oral tradition survives.
The flooding of the fresh water Black Sea with salt water from the Mediterranean may have displaced populations and sent them West. The sea filled with salt water and also would have sent water rushing up river channels resulting in massive flash-flooding inland along rivers.
The Black Sea flood was about 5600 BC."
Falstech who has made a lifetime career of Biblical Chronology, would put Gilgamesh late in the 22nd or early in the 21st century BC--within a a couple hundred years of the Biblical Flood.
I can't think of any reason localized flooding in the Black Sea area as a result of breach of an ice dam has any real relationship to the flood described in Genesis--can you? The Black Sea event clearly occurred several thousand years before the earliest possible date that can be constructed from the Bible chronology.
Yup. Ryan & Pittman in their book, Noah's Flood speculate that it was this event that spread farming and the Indo-European language all over Europe. People were able to walk away from this event with what they could carry plus animals. The region around the Black Sea at that time was very arid and everyone was crowded around the fresh-water edge probably doing some sort of irrigation farming. Salt-water wiped it all out and they had to move up the river valleys.