Wyniki wyszukiwania

1

Physical water and retaining properties of hydrogenic soil of the Vistula delta

100%

Piascik H., Smolczynski S., Orzechowski M.

Polish Journal of Soil Science

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1998

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tom 31

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nr 2

2

Water management in the Vistula delta (Poland)

100%

Kowalik P. J.

Meteorology Hydrology and Water Management. Research and Operational Applications

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2016

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tom 04

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nr 1

This paper presents past and recent water management in the area called the Vistula Delta Fens (Żuławy Fens). This area (56 x 56 km) is located at the outlet of the Vistula River to the Baltic Sea, at the shore of the Gulf of Gdańsk. A large part of the area (30%) is located below sea level as potentially submerged depressions. A multitude of rivers, channels, ditches and pumping stations have been constructed here over several centuries. The area is characterized by highly productive alluvial soils, surface water with a high potential for fish-farming and fishery, and attractive tourist areas at the banks of the rivers and channels. Historically, floods have occurred repeatedly as a result of: (i) – breaks in the dams along big rivers, e.g. after heavy rains and high water levels (in summer); (ii) – dam breaks caused by accumulation of ice-cakes in winter or during spring times; (iii) – dam breaks after storms on the sea with increasing sea water levels at the river outlets (mainly in winter); (iv) – overflow of water into flat land after heavy rains followed by slow drainage of water from the fields, ditches, channels and pumping stations (in summer); (v) – overflow of water into depressions and swamps below sea level after interruptions of, or decreases in, the pump operations at the pumping stations. The EU directive on flood control advises that the member countries should: (i) – produce maps of the areas vulnerable to floods to facilitate communication and planning; (ii) – develop management plans for flooding events; (iii) – exchange experience and codes of good practice during flood; (iv) – facilitate a close cooperation between the scientific community and politicians in the field of flood protection; (v) – raise the level of knowledge, communication and awareness among local societies living in areas prone to flooding.

3

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Hydrology and morphology of two river mouth regions (temperate Vistula Delta and subtropical Red River Delta)

84%

Pruszak Z., Van Ninh P., Szmytkiewicz M., Hung N. M., Ostrowski R.

Oceanologia

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2005

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tom 47

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nr 3

The paper presents a comparative analysis of two different river mouths from two different geographical zones (subtropical and temperate climatic regions). One is the multi-branch and multi-spit mouth of the Red River on the Gulf of Tonkin (Vietnam), the other is the smaller delta of the river Vistula on a bay of the Baltic Sea (Poland). The analysis focuses on the similarities and differences in the hydrodynamics between these estuaries and the adjacent coastal zones, the features of sediment transport, and the long-term morphodynamics of the river outlets. Salinity and water level are also discussed, the latter also in the context of the anticipated global effect of accelerated sea level rise. The analysis shows that the climatic and environmental conditions associated with geographical zones give rise to fundamental differences in the generation and dynamic evolution of the river mouths.

4

The importance of redox processes for the formation of water conditions in alluvial soils of the Vistula River delta

84%

Ostrowski J.

Journal of Water and Land Development

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2001

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nr 05

Alluvial soils of the Vistula River delta are one of the most fertile soils in Poland. Part of the area is a depression, whose agricultural utilization relies upon the efficient reclamation systems on polders. High ground water levels enhance redox processes, restriction of which is one of more important functions of the draining systems. This paper presents short characteristics of the redox status of alluvial soils in the delta and describes processes and consequences of oxygen deficits in soils. The importance of indices of oxygen deficit for the formation of water conditions, which would favour agricultural utilization of the delta soils, is underlined.

5

Distribution, abundance and environmental conditions of the clonal aquatic fern Salvinia natans (L.) All. in the Vistula Delta (Baltic Sea Region)

67%

Galka A., Szmeja J.

Biodiversity: Research and Conservation

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2012

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tom 28

6

Energy values and energy resources of two prawns in Baltic coastal waters: the indigenous Palaemon adspersus and the non-indigenous Palaemon elegans

67%

Janas U., Bruska O.

Oceanologia

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2010

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tom 52

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nr 2

281-297

Until recently only two palaemonid species inhabited the southern Baltic: Palae- mon adspersus and Palaemonetes varians. Soon after the year 2000 a new species – Palaemon elegans – arrived and quickly established itself as a new component in the trophic web. The objects of this research were to define the energy value and energy resources of P. elegans and to compare them with the corresponding values for the native P. adspersus. These parameters will supply information about this new link in the trophic web and may help to explain the part played by the new prawn and its population in the energy flow. This work demonstrated that the energy values of both prawn species were very much the same: the average energy value of P. elegans was 16.5±2.1 J mg−1 DW (19.3 ± 2.5 J mg−1 AFDW) (N = 150), that of P. adspersus was 16.7 ± 2.1 J mg−1 DW (19.5 ± 2.5 J mg−1 AFDW) (N= 71). No statistically significant differences in energy value were found between the two species with respect to sex, size or season. The results show that P. elegans is an energetically valuable food item for predators. Its energy resources in Polish brackish coastal waters can be as high as 150 kJ m−2; the highest among the palaemonid species in this area, they constitute a rich supply of food for other organisms.

7

New data on the non-indigenous gammarids in the Vistula Delta and the Vistula Lagoon

67%

Surowiec J., Dobrzycka-Krahel A.

Oceanologia

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2008

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tom 50

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nr 3

443-447

This communication reports on the occurrence of non-indigenous gammarid species of Ponto-Caspian and of North American origin – in the lower course of the River Vistula, in its Delta and in the Vistula Lagoon.

8

Facies model of the contemporary delta lobe of the Vistula River

67%

Koszka-Maron D.

Oceanological and Hydrobiological Studies

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2009

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tom 38

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nr Suppl.1

57-68

9

Population structure and regeneration of Phragmites australis [Cav.] Trin ex Steud. in flood control ditches in the depression wetland [Zulawy Wislane, Northern Poland]

67%

Boszke P., Bociag K., Szmeja J.

Polish Journal of Ecology

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2005

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tom 53

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nr 1

The population structure of Phragmites australis (Cav.) Trin. ex Steud. was examined in seven categories of overgrowing flood control ditches, differing on time which had elapsed from the last clean-up. Density, biomass, frequency of development stages, as well as the size and habit of the shoots, were determined in the populations. Site conditions in the ditches and the proportion of the common reed in the total biomass of plants were also examined. The rate at which populations in cleaned ditches regenerate is very quick. Three years after the maintenance works in ditches the reed population is already fully regenerated. Well developed reed rushes, which biomass is about 650 g d.w.m⁻², are dominant. Its density amounts to 76 ± 25 shoots m⁻². Flowering and fruiting shoots are the most numerous. The first signs of population regression were observed in the ditches left without cleaning for more than 5 years. Population density is gradually lower, the proportion of generative shoots is reduced, and the reed is lighter and has smaller assimilation area. In the 11-year-old and older ditches the reed is replaced by other plant species, mainly grasses and shrubs.

10

Program rewitalizacji gospodarczej obszaru delty Wisły i Zalewu Wiślanego

59%

Kowalik P.

Zeszyty Problemowe Postępów Nauk Rolniczych

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2008

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tom 528

Opracowanie dotyczy rewitalizacji obszaru delty Wisły i Zalewu Wiślanego. Opracowanie składa się z dwóch części: część pierwsza nazwana może być częścią diagnostyczną, część druga to wspomaganie przyszłych decyzji. Omawia się zabezpieczenie przeciwpowodziowe, rolnictwo, przemysł, usługi oraz budżet. Przedstawiono silne i słabe strony regionu i omówiono bariery rozwojowe. Wskazano na priorytetowe działania i inwestycje w regionie.

Ograniczanie wyników

Physical water and retaining properties of hydrogenic soil of the Vistula delta

Water management in the Vistula delta (Poland)

Hydrology and morphology of two river mouth regions (temperate Vistula Delta and subtropical Red River Delta)

The importance of redox processes for the formation of water conditions in alluvial soils of the Vistula River delta

Distribution, abundance and environmental conditions of the clonal aquatic fern Salvinia natans (L.) All. in the Vistula Delta (Baltic Sea Region)

Energy values and energy resources of two prawns in Baltic coastal waters: the indigenous Palaemon adspersus and the non-indigenous Palaemon elegans

New data on the non-indigenous gammarids in the Vistula Delta and the Vistula Lagoon

Facies model of the contemporary delta lobe of the Vistula River

Population structure and regeneration of Phragmites australis [Cav.] Trin ex Steud. in flood control ditches in the depression wetland [Zulawy Wislane, Northern Poland]

Program rewitalizacji gospodarczej obszaru delty Wisły i Zalewu Wiślanego