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1

Estimation of the attenuation of visible light in watrs of the Gulf of Gdansk with the use of Secchi transparency

100%
Matciak M.
Oceanological Studies
|
1997
|
vol. 26
|
issue 4
35-40
EN
Simple formula for computing irradiance attenuation in the Gulf of Gdansk waters in a func-tion of chlorophyll a concentration is obtained on the basis of field data. In its derivation, the relationship between Secchi depth and diffuse attenuation coefficient of visible irradiance was applied.
2

Theoretical approach to the estimation of water optical properties from the radiance field in the sea

100%
Matciak M.
Oceanological Studies
|
2001
|
vol. 30
|
issue 1-2
99-111
EN
A general problem of determining water inherent optical properties from natural light radiance distribution in the sea and its depth dependency is analysed. Expressions for light-beam attenuation coefficient of practical significance are obtained. The presence of internal sources of light energy like fluorescence and Raman scattering by water molecules is included in consideration.
3

The relationship between Secchi depth

63%
Matciak M., Renk H.
Oceanological Studies
|
1997
|
vol. 26
|
issue 2-3
31-37
EN
Seawater transparency estimated by means of the Secchi disc depth depends on all optically active water constituents, among them the chlorophyll a concentration. This parameter is very important for primary production studies, and it might be very useful to investigate its relationship to the water transparency measured in such an easy way. Long-term observations of the chlorophyll a concentration and the associated Secchi disc depth from three stations in the southern Baltic are presented. The data were collected during almost twenty five years (1971-1995). The correlation between these parameters and the influence of chlorophyll a concentrations on the Secchi disc depth are examined.
4

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

51%
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.
5

Presumable groundwater seepage influence on the upwelling events along the Hel Peninsula

51%
Matciak M., Urbanski J., Piekarek-Jankowska H., Szymelfenig M.
Oceanological Studies
|
2001
|
vol. 30
|
issue 3-4
125-132
EN
Low water salinity values were recorded during upwelling events along the marine side of the Hel Peninsula. The most probable explanation of those unexpected results is a submarine groundwater discharge in this region. The hydrogeological structure of the area and some previous studies on salinity anomalies observed in the Gulf of Gdansk seem to confirm the hypothesis. This report encourages further complex research aimed at studying this phenomenon.
6

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

51%
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.
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