Naslov
Contribution of high-frequency (T < 2 h) sea level oscillations to the Adriatic sea level maxima

Autori
Ruić, Krešimir ; Šepić, Jadranka ; Mlinar, Marko ; Međugorac, Iva

Izvornik
Natural Hazards (0921-030X) 116 (2023), 3; 3747-3777

Vrsta, podvrsta i kategorija rada
Radovi u časopisima, članak, znanstveni

Ključne riječi
Sea level, High-frequency sea level oscillations, Meteotsunamis, Storm surges, Adriatic Sea

Sažetak
Sea level time series of up to 17.5 years length, recorded with a 1 min sampling interval at 18 tide gauges, evenly distributed along the eastern and western coast of the Adriatic Sea (Mediterranean), were analysed in order to quantify contribution of high-frequency sea level oscillations to the positive sea level extremes of the Adriatic Sea. Two types of sea level extremes were defined and identified: (1) residual extremes which are mostly related to storm surges and (2) high-frequency (T < 2 h) extremes, strongest of which are meteotsunamis. The detailed analysis of extremes led to the following conclusions: (1) highfrequency sea level oscillations can dominate positive sea level extremes ; (2) even when not dominating them, high-frequency oscillations can considerably contribute to extreme sea levels ; (3) contribution of high-frequency oscillations to total signal is governed by a combination of bathymetry and atmospheric forcing, resulting in the strongest high-frequency oscillations over the middle Adriatic ; (4) residual extremes mostly happen from October to January when they are also the strongest, while high-frequency extremes spread more evenly throughout the year, with the strongest events peaking during May to September ; (5) tide gauge stations can be divided into three distinct groups depending on the characteristics of high-frequency oscillations which they record. Conclusively, both lowfrequency and high-frequency sea level components must be considered when assessing hazards related to sea level extremes, implying that availability and analysis of 1 min sea level data are a must.

Izvorni jezik
Engleski

Znanstvena područja
Fizika, Geofizika

POVEZANOST RADA