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Observations of presumable groundwater seepage occurrence in Puck Bay (the Baltic Sea)

Matciak M., Bieleninik S., Botur A., Podgórski M., Trzcińska K., Dragańska K., Jaśniewicz D., Kurszewska A., Wenta M.

Oceanological and Hydrobiological Studies

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2015

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Vol. 44, No. 2

267--272

EN

We report the results of recent field measurements of seawater thermohaline structure and transparency carried out in early summer 2014 in Puck Bay. Near-bottom, less saline waters occurred almost in the entire study area. Their occurrence in the shallow part of Puck Bay was accompanied by an increase in the seawater transparency. The most likely explanation of these observations is a submarine fresh groundwater discharge.

2

Upwelling intrusion into shallow Puck Lagoon, a part of Puck Bay (the Baltic Sea) [commun.]

Matciak M., Nowacki J., Krzymiński W.

Oceanological and Hydrobiological Studies

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2011

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Vol. 40, No.2

108-111

EN

In this short communication we present the results of field measurements which show the incidence of waters originating from the deeper layers of Puck Bay in shallow Puck Lagoon. The reason for such a situation is the occurrence of a small-scale upwelling. This phenomenon may play a significant role in shaping the ecosystem conditions of Puck Lagoon, which is unique in terms of its natural values.

3

Upwelling characteristics in the Puck Bay (the Baltic Sea)

Nowacki J., Matciak M., Szymelfenig M., Kowalewski M.

Oceanological and Hydrobiological Studies

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2009

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Vol. 38, No.2

3-16

EN

The spatial distributions of basic water parameters in the Puck Bay, a small semi-closed water body located on the southern coast of the Baltic Sea, were often typical of upwelling phenomenon. In such situations, like those observed in July of 1999, temperature decreased locally and water transparency increased locally. The present study analyzed conditions under which upwelling occurred using maps of horizontal currents at different depths, which were obtained from an operational hydrodynamic model. With north, northwest winds the upwelling in Puck Bay looked like the shallow-water upwelling arising as a direct dynamic response of the water body to the wind direction, without a distinct effect of the Coriolis force. However, upwelling water circulation during other wind directions, i.e. west and northeast winds, did not match this simple scheme and was affected by coastline configuration. The results of many years’ measurements pointed at an important role of upwelling in hydrological regime formation in the shallow parts of the Puck Bay.

4

Variability of the radiant heating rate at the border between water masses with different absorption properties – a theoretical prediction

Matciak M.

Oceanological and Hydrobiological Studies

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2006

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Vol. 35, No.2

193-203

EN

The spatial distribution of the radiant heating rate (RHR) in an area of seawater absorption change was investigated by means of a theoretical model. It was found that a sufficiently high gradient of the absorption coefficient in a horizontal direction could contribute significantly to the water’s warming. When combined with an absorption increase in the vertical direction, it raised the local RHR value to about one and a half times its value in the adjacent area. Moreover, when solar energy propagated through the water of higher absorption and entered the area of lower absorption, the horizontal component of the absorption gradient resulted in a lowering of the RHR value. The highest obtained spatial differences between the radiant heating rate values was of the order of 10-2 oC per hour under the conditions of a cloudless sky with the sun zenith angle at 45o and sea surface irradiance value of nearly 700 W m-2.

5

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

Matciak M.

Oceanological Studies

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2001

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Vol. 30, No. 1-2

99-110

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.

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

Matciak M., Urbański J., Piekarek-Jankowska H., Szymelfenig M.

Oceanological Studies

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2001

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Vol. 30, No. 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.

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

Nowacki J., Matciak M.

Oceanological Studies

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2000

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Vol. 29, No. 4

83-98

EN

The potential chemical impact of a treated sewage discharged from the "Gdansk-Wschod" Sewage Treatment Plant to the Gulf of Gdańsk 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.