Articles | Volume 22, issue 4
https://doi.org/10.5194/os-22-2471-2026
https://doi.org/10.5194/os-22-2471-2026
Research article
 | 
17 Aug 2026
Research article |  | 17 Aug 2026

High current speed events in a harbor channel driven by resonant sub-hourly sea level dynamics: an example from Varna, Black Sea

Jüri Elken, Laura Piho, and Maarja Kruusmaa

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Short summary
Three novel Hydromast stations revealed occasional high-amplitude current and water-level oscillations in the 2.4-km-long navigation channel, with dominant periods of 37 and 19 minutes. The oscillation events reflect resonant long-wave forcing from the open sea. The maximum changes in currents and sea level – 0.8 m s−1 and 0.8 m – are harmful to ship navigation, harbor operations, and coastal management. Approaches for detecting and forecasting strong sub-hourly oscillations are discussed.
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