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  1. 2 Oceanological Studies

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  1. 2 1997

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  1. 1 Jedrasik J.

  2. 1 Kowalewski M.

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1

A three-dimensional hydrodynamic model of the Gulf of Gdansk

100%
Kowalewski M.
Oceanological Studies
|
1997
|
vol. 26
|
issue 4
77-98
EN
A three-dimensional, baroclinic, hydrodynamic model was based on the coastal ocean circulation model (Blumberg and Mellor 1987) known as POM (Princeton Ocean Model), which was adapted to Baltic conditions. The way of horizontal advection calculation has been modified by using TVD filtration (Total Variation Diminishing) thus oscillations in frontal zones have been elimi-nated. To predict water exchange between the Gulf of Gdansk and the open sea, the model covers the whole Baltic Sea together with the Danish Straits. The model has been verified based on three-year simulation of spreading of freshwater introduced by 49 biggest rivers. The influence of wind has been taken into account assuming the variable fields of shear stress every 6 hours. Thermic conditions have been affected by heat fluxes calculated from meteorological data. Calculated and measured salinity and temperature distributions are in relatively good accordance for the surface layer. Seasonal changes in vertical distributions of temperature as well as formation and disappearance of thermocline have been approximated properly.
2

The influence of the advection on the water temperature distribution

88%
Jedrasik J.
Oceanological Studies
|
1997
|
vol. 26
|
issue 4
41-64
EN
The influence of advection on spatial distribution of temperature in the Gulf of Gdansk is ana-lysed. In this analysis heat fluxes are completely omitted. The advection is brought about mainly by winds and depends particularly on their direction. Eastern winds curry the surface waters (usually contaminated) out of the Gulf and cause the inflow of cool bottom waters from the Gdansk Deep. The same winds induce the movement of the oceanic salty and oxidized water from the Bornholm to the Gdansk Deep via the Slupsk Channel. The advection during eastern winds is a desirable phenomenon for restoring the Gulf of Gdansk waters. The temperature distribution depends also on the advection influenced by meridional winds.
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