Tide-gauge station Bakar is the oldest Croatian station established in December 1929 by the Geophysical Institute (Zagreb). The station worked until the begining of World War II. It was reestablished in 1949 and it is still in operation. The station is equipped with analog float-type instrument installed over a stilling well located in the Custom Office (Bakar city). The well is connected to the sea via a connecting pipe. The station was modernized in the early 2000s when digital sensors were installed, along with GPRS modems for real/near-real time data acquisition. Digital float-type sensor was installed in October 2003 (OTT Thalimedes) next to the analog instrument. Radar sensor (OTT Kalesto) was installed in open air (~300 m southeast from the well) in September 2004. Digital instruments measure 1-min averages of sea level and transmit them with 15 min latency to Geophysical Department. Ancillary air pressure is also measured (1-min averages). Analog data are digitized (hourly resolution) and processed once a year. All instruments measure sea level relative to the same reference level. Analog instrument is considered the main one while the other two instruments measure high-frequency oscilations and serve as backup. Station is leveled to the national geodetic network via bench marks BV15663 and A510.
Bakar sea-level time series is over 90 years long which makes it the longest series of an oceanographic parameter measured in Croatia. Due to its length and quality, Bakar sea levels were used in studies of different processes (e.g., mean sea level, seasonal cycle, sea-level response to planetary forcing, storm surges, the basin-wide and bay seiches, tides). List of papers that made use of the Bakar data can be found here.
The Bakar tide-gauge station is located at the head of the Bakar Bay in the Adriatic Sea.
Latitude: 45o 18.3’
Longitude: 14o 32.4’
More information about the station can be found in these papers:
Međugorac I, Pasarić M, Orlić M (2021): Historical sea-level measurements in Bakar (Adriatic Sea). In preparation.
Pasarić M, Orlić M (2008): Mareografska postaja Bakar: mehanički ili radarski instrument? U: Ožanić, N. (ed.), Znanstveno savjetovanje - Hidrološka mjerenja i obrada podataka - Zbornik radova, 26-28. Rijeka: Digital pointtiskara d.o.o, 319-328.
Orlić M, Pasarić, M (1998): Sedam desetljeća mareografskih mjerenja u Bakru. Prirodoslovna istraživanja riječkog područja. Prirodoslovni muzej, 201-211.