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The Influence of Modern Alluvial Areas on Sea Level Changes in The Neva Bay During Storm Surges in The Conditions of Operation of The Saint Petersburg Flood Prevention Faculty Complex

https://doi.org/10.59887/2073-6673.2024.17(2)-9

Abstract

Using numerical experiments with a three-dimensional baroclinic hydrodynamic model of the Baltic Sea, which covers the refined grid area around the Neva Delta and Neva Bay, and takes into account the operations of the Saint Petersburg Flood Prevention Facility Complex (FPFC), we investigate the influence of modern alluvial areas on sea level changes in the Neva Bay and Neva Delta during storm surges, under different volumes of Neva River discharge. The hydrological conditions that developed in early December 2015, when Storm Desmond approached St. Petersburg, which caused three dangerous level rises in the east of the Gulf of Finland, one after the other. The alluvial deposits of territories do not have noticeable changes in the sea level of the Neva Bay with the gates of the FPFC closed during storm surges. It is shown that, depending on the runoff of the Neva, with the gates of the FPFC closed, additional sea level rises in the Neva Bay due to alluviation do not exceed 1–5 cm, while in the Neva Delta they reach 20.5 cm. The rise of the sea level to 161 cm at the Mining University, at which floods are recorded in St. Petersburg, occurs due to alluviation 1–2 hours earlier. At the maximum volume of Neva runoff for the autumn-winter period, 27 hours after the closure of the gates of the FPFC, a dangerous flood is recorded in the Neva Bay near the Mining University point, and 48 hours later — a particularly dangerous one.

About the Authors

N. A. Tikhonova
St Petersburg State University; Zubov State Oceanographic Institute
Russian Federation

33-35 10th line V.O., 199178 St Petersburg

Kropotkinsky Lane 6, 119034 Moscow



E. A. Zakharchuk
St Petersburg State University
Russian Federation

33-35 10th line V.O., 199178 St Petersburg



A. V. Gusev
Zubov State Oceanographic Institute; Marchuk Institute of Numerical Mathematics of the RAS; Shirshov Institute of Oceanology of the RAS
Russian Federation

Kropotkinsky Lane 6, 119034 Moscow

8 Gubkina Str., 119333 Moscow

Nakhimovsky av. 36, 117997 Moscow



V. S. Travkin
St Petersburg State University; Zubov State Oceanographic Institute
Russian Federation

33-35 10th line V.O., 199178 St Petersburg

Kropotkinsky Lane 6, 119034 Moscow



A. A. Pavlovsky
St Petersburg State University; State “Research and Design Center of St. Petersburg Master Plan”
Russian Federation

33-35 10th line V.O., 199178 St Petersburg

1–3 Zodchego Rossi Str., 191023 St Petersburg



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Review

For citations:


Tikhonova N.A., Zakharchuk E.A., Gusev A.V., Travkin V.S., Pavlovsky A.A. The Influence of Modern Alluvial Areas on Sea Level Changes in The Neva Bay During Storm Surges in The Conditions of Operation of The Saint Petersburg Flood Prevention Faculty Complex. Fundamental and Applied Hydrophysics. 2024;17(2):103-118. (In Russ.) https://doi.org/10.59887/2073-6673.2024.17(2)-9

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