The Catastrophic Flood of the Neva River in 1924

摘要

The necessity of simultaneous analysis of the maximum heights for all three catastrophic floods of the Neva River of September 10(21), 1777, November 7 (19), 1842, and September 23, 1924, interconnected by inter elevation measurements was stated earlier [1,2].rnThe flood of 1924 was preceded by abnormal hydrometeorological situation in the Atlantic and Europe caused by a strong cyclone originated on September 13 near the coast of Cuba. The water in the Neva mouth "began to recede" in the morning on September 23, but by 2 p.m. the height reached 180 cm above zero water level. The water rise "was barely discernable" in the interval 2 p.m.-3 p.m., which "allowed the supposition that the water would recede." However, "the water started to flow rapidly, and by 7 p.m it had reached its maximum of about 365 cm (12 feet)." Stormy weather from the sea (with a windflow of 41 m/s) favored this "additional" Neva water rise. The water "began to recede" after 7 p.m., and the Neva "filled the coasts" by the morning [3, p. 23].