Abstract
Abstract The decision to build a new waterway (strait) in the Polish part of the Vistula Spit was made in 2017. The new connection between the Gulf of Gdańsk and the Vistula Lagoon is planned as an artificial navigable channel with a lock and a small port. During storm surges and wind tides in the gulf or in the lagoon, sluicing will be required for vessels to tackle the Vistula Spit. This procedure does not require significant water flow through the channel in normal conditions. However, in the case of a lock failure or in the case of controlled opening of the gate to increase water exchange in the lagoon or to reduce flood risk in the Vistula Lagoon, high flow rates may occur in the navigable channel and in the neighboring port basin. In order to inves-tigate the hydraulic conditions in such extraordinary situations, numerical modeling of the hydrodynamics during water damming in the gulf or in the lagoon is performed. To analyze the hydrodynamics of the artificial connection between the sea and the lagoon during periods of high water stages, mathematical modeling is required. This paper presents the shallow water equations (SWE) model adapted to simulate the flow through the port basin and the navigable channel. The calcula-tions allowed the relation between the water head and the capacity of the navigable channel to be found, as well as to analyze circulations which may occur in the port basin.
Highlights
The Vistula Lagoon is located in the east part of the Gulf of Gdańsk (Baltic Sea) (Fig. 1)
The lagoon represents a transboundary water body divided into two parts by the country border between Poland and Russia
The only connection between the Vistula Lagoon and the Baltic Sea is through the Strait of Baltiysk, which is 2 km long, 440 m wide and approximately 8.8 m deep
Summary
The Vistula Lagoon is located in the east part of the Gulf of Gdańsk (Baltic Sea) (Fig. 1). The length of the lagoon is 90.7 km, and its width varies from almost 6 km up to 13 km. The lagoon is a shallow basin with a mean depth of about 2.75 m. It is separated from the Gulf of Gdańsk by the Vistula Spit. The only connection between the Vistula Lagoon and the Baltic Sea is through the Strait of Baltiysk (located in the Russian part of the lagoon), which is 2 km long, 440 m wide and approximately 8.8 m deep. The total area of the lagoon measures 838 km, of which 472.5 km belongs to Russia. The shoreline is 270 km long [1] [2]
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