Abstract
Based on the results of field measurements in the spring of 2023, the water intrusion from the receiving reservoir (Vistula Lagoon) 7.5 km deep into the mouth section of the Pregolya River (Kaliningrad) was recorded. The presence of two sharp frontal zones was revealed (the first one is between the marine and lagoon waters, the second one is between the brackish waters of the Kaliningrad Sea Canal and the fresh waters of the Pregolya River), as well as a mixing zone (salinity of 4–5 psu) 20–25 km long between them. It is noted that the near-bottom boundary of the river frontal zone is significantly “deeper” in the estuary of the Pregolya River than it was observed at the turn of the 2000s. The mixing zones within the Kaliningrad Sea Canal and the Vistula Lagoon are independent, because they are separated by a chain of islands, and the lagoon and canal are different hydrological objects.
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