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1

Long-term trends of concentration of nitrates, phosphates and oxygen in the Gulf of Gdansk

100%
Nowacki J., Kowalewski M., Krezel A.
Oceanological Studies
|
1993
|
issue 64/3
123-130
2

Hydrological and hydrodynamic processes ion marine part of Vistula estuary: in situ measurements versus mathematical modelling

100%
Matciak M., Nowacki J., Robakiewicz M.
Oceanological Studies
|
1997
|
vol. 26
|
issue 4
161-174
EN
Hydrological and hydrodynamic processes in Vistula estuary monitored in situ and their repre-sentation by numerical model are presented. The modelled distributions of salinity and tempera-ture from the 22nd September 1995 show acceptable agreement with measurements. Results of hydrodynamic model support observations showing the spreading of fresh water along the Gulf of Gdansk shore.
3

Characteristics of the selected hydrological parameters of the Gulf of Gdansk in the planned area of sewage discharge from the Gdansk -Wschod sewage-treatment plant

100%
Nowacki J., Matciak M. M., Matciak M.
Oceanological Studies
|
2000
|
vol. 29
|
issue 4
81-96
EN
The potential chemical impact of a treated sewage discharged from the ?Gdansk-Wschod? Sewage Treatment Plant to the Gulf of Gdansk was studied. A physical and chemical investigation of the sediments sampled in the area of the planned collector outlet as well as results of an earlier research were the basis for the present paper. A spatial distribution of majority of the studied sediment components shows a distinctive zoning that is clearly due to them being supplied by the Vistula River (Wisla River). This is particular for the mercury, lead, zinc and chromium as well as organic carbon and phosphorus. A distribution of the redox potential shows too a distinctive relation to the Vistula River mouth. Starting a sewage discharge through a new collector located between the two river mouths of the Wisla Smiala and the Wisla Przekop can move westwards the presently observed zoning of increased concentrations of some chemicals. However, most probably such changes will be small and they will not cumulate themselves over time.
4

Escherichia coli survival in the water from the Gulf of Gdansk under laboratory conditions

88%
Krolska M., Latala A., Michalska M., Nowacki J., Sobol Z.
Oceanological Studies
|
1997
|
vol. 26
|
issue 4
133-143
EN
Faecal coliform bacteria (among others Escherichia coli) are routinely used in monitoring of water areas (first of all seaside resorts). Their occurrence indicates recent pollution by municipal sewage. Survival of these bacteria in the sea water depends on the complex of biological, chemi-cal and physical water parameters. There are many conflicting opinions on bacterial death-rate and the data on this phenomenon for the Gulf of Gdansk are rather scarce. The influence of irradi-ance (0-200 mumol photon m-2 s-1), temperature (5-20 ?C) and salinity (0-7.5 psu) on the survival of Escherichia coli strain K-12 has been investigated. The bacterial cultures were incubated for three days under chosen temperature, salinity and irradiance conditions. Experiments were planned based on the factorial design (method x'). The cell density was determined every day by direct viable count on agar plates. The obtained results were analysed statistically in such a way that temperature, salinity and irradiance were independent variables whereas Escherichia coli number and mean mortality coefficient (Km) were the dependent ones. It was found that the effect of salinity (in studied range from 0 to 7.5 psu) on Escherichia coli survival was not statistically significant. However, the survival was strongly correlated with temperature and irradiance. Correlation coefficient (R) between temperature and irradiance and mean coefficient of Escherichia coli mortality (Km) equalled 0.801. This dependence can be described by a function, obtained from nonlinear regression analysis, Km = 6.466 - 0.195 t + 2.215?10-7 t2 i2. The function will be used for the development of a model of matter circulation and energy flow in the Gulf of Gdansk.
5

Nutrients and oxygen in the Gulf of Gdansk

87%
Falkowska L., Bolalek J., Nowacki J.
Oceanological Studies
|
1993
|
issue 64/3
131-162
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