Environmental impact of water exchange blocking in a strait – a multidisciplinary study in the Baltic Sea

Liblik, Taavi; Buschmann, Fred; Siht, Enriko; Kuprijanov, Ivan; Väli, Germo; Lipp, Maarja; Erm, Ants; Laanemets, Jaan; Eschbaum, Redik; Verliin, Aare; Saks, Lauri; Zekker, Ivar

doi:10.1016/j.oceano.2023.06.002

Artykuł - szczegóły

Tytuł artykułu

Environmental impact of water exchange blocking in a strait – a multidisciplinary study in the Baltic Sea

Autorzy

Liblik Taavi , Buschmann Fred , Siht Enriko , Kuprijanov Ivan , Väli Germo , Lipp Maarja , Erm Ants , Laanemets Jaan , Eschbaum Redik , Verliin Aare , Saks Lauri , Zekker Ivar

Wybrane pełne teksty z tego czasopisma

Identyfikatory

DOI

10.1016/j.oceano.2023.06.002

Warianty tytułu

Języki publikacji

Abstrakty

In this study, we report the environmental impact of water exchange blocking by a 3 km road dam built in 1896 in the shallow Väike Strait, north-eastern Baltic Sea. Using a multidisciplinary measurement campaign and numerical simulations, we show ecological conditions in the strait have considerably altered; the previously free-flowing strait now comprises two bays with separate circulation systems. Water exchange in the area close to the dam has decreased 10–12-fold. Since advection is weakened, exchange with the atmosphere and sediments has a relatively greater role in shaping water characteristics. Consequently, occasional very high sea surface temperature, salinity, and total nitrogen, and strong diurnal cycles in water temperature (>4°C) and dissolved oxygen (>4 mg l−1) were observed near the dam in summer. Oxygen levels are continuously below saturation in winter and concentration occasionally drops to hypoxic levels with ice cover. Nitrogen content in sediments near the dam is 3–4 times higher than in neighboring areas. The dam also modifies sea level, wind wave and suspended matter patterns in the strait. Sediments near the dam show elevated content of hazardous substances likely associated with traffic on the dam road. The phytobenthos community near the dam is dominated by annual green algae, which massively decompose during winter. The dam likely impedes fish migration between suitable feeding and spawning areas, also there have been fish kills caused by rapid fluctuations in sea levels, amplified by dam. The construction of new openings would alleviate negative impacts of the dam.

Słowa kluczowe

water exchange environmental impact of marine structures shallow sea fish migration Baltic Sea

Wydawca

Polish Academy of Sciences, Institute of Oceanology
Elsevier

Czasopismo

Oceanologia

Rocznik

2024

Tom

Vol. 66 (1)

Strony

9--25

Opis fizyczny

Bibliogr. 71 poz., fot., map., rys., tab., wykr.

Twórcy

autor

Liblik Taavi

Taavi.liblik@taltech.ee

Tallinn University of Technology, Tallinn, Estonia

autor

Buschmann Fred

Tallinn University of Technology, Tallinn, Estonia

autor

Siht Enriko

Tallinn University of Technology, Tallinn, Estonia

autor

Kuprijanov Ivan

Tallinn University of Technology, Tallinn, Estonia

autor

Väli Germo

Tallinn University of Technology, Tallinn, Estonia

autor

Lipp Maarja

Tallinn University of Technology, Tallinn, Estonia

autor

Erm Ants

Tallinn University of Technology, Tallinn, Estonia

autor

Laanemets Jaan

Tallinn University of Technology, Tallinn, Estonia

autor

Eschbaum Redik

University of Tartu, Estonian Marine Institute, Tartu, Estonia

autor

Verliin Aare

University of Tartu, Estonian Marine Institute, Tartu, Estonia

autor

Saks Lauri

University of Tartu, Estonian Marine Institute, Tartu, Estonia

autor

Zekker Ivar

University of Tartu, Estonian Marine Institute, Tartu, Estonia

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Bibliografia

Identyfikator YADDA

bwmeta1.element.baztech-b19dcbd3-59bf-4ef0-a35e-76996f00cb14