I watched a Nova show on Noah's Ark, and they built a round boat called a based on some ancient writings connected with the flood (called the Ark Tablet). They wanted to know just how big they could get it before it collapsed. However, those vessels were used extensively in the Mesopotamian area and are still used today in places like Wales, England, India, etc.
Whether or not the Black Sea was the location of the Flood is secondary to the date it was inundated.
If anyone wants my completely uneducated opinion, the Mesopotamians and Egyptians originally came from the Black Sea and Caspian Sea area.