Preferencje help
Widoczny [Schowaj] Abstrakt
Liczba wyników

Znaleziono wyników: 20

Liczba wyników na stronie
Pierwsza strona wyników Pięć stron wyników wstecz Poprzednia strona wyników Strona / 1 Następna strona wyników Pięć stron wyników wprzód Ostatnia strona wyników

Wyniki wyszukiwania

Wyszukiwano:
w słowach kluczowych:  Dunajec River
help Sortuj według:

help Ogranicz wyniki do:
Pierwsza strona wyników Pięć stron wyników wstecz Poprzednia strona wyników Strona / 1 Następna strona wyników Pięć stron wyników wprzód Ostatnia strona wyników
Water quality data from the upper Dunajec watershed collected by the state monitoring service in the last 25 years (1977-2003) were examined to asses the evolution of water quality indicators and evaluate the limnological status of the recently constructed Czorsztyn reservoir. The characterization of the watershed and its hydrology is followed by the presentation of physico-chemical and some biological descriptors. The discussion emphasises the temporal trends and links between various observations. It has been concluded that the deterioration of physico-chemical water quality of the upper Dunajec river observed between 1977 and 1988 has been partly reversed due to the construction of wastewater treatment plants and possibly due to the collapse of economic development in 1989.
This paper addresses the problem of how drought definition by POT and SPA methods influences drought characteristics. Using the 1984- 2013 daily flows at 24 selected gauging stations in the Dunajec river basin and assuming two threshold levels Q70% and Q95% and four minimum drought durations (5, 7, 10 and 14 days) as the pre-set criteria, it was shown that, when compared to the POT method, the application of the SPA method usually leads to less number of droughts and, consequently, of longer duration. The SPA method, differently from POT, reduces dramatically the number of inter-event times, which suggests that some adjacent POT droughts may be dependent and should be pooled.
Zinc present in water penetrates into the organism of a fish either directly, through the skin and gills, or indirectly, with food taken into the alimentary canal. The toxocity of this metal is associated with the transporting function of blood, which distributes it over the whole organism. The aim of this paper was to assess the zinc content in water and bottom sediments collected from the Dunajec River, and also in selected organs of bleak (Alburnus alburnus L.). The bioaccumulation factors for this element in the muscles, liver, skin and bones of the fish were calculated from the results of the research, which was carried out in 2011. Samples of water and bottom sediments were collected twice, in July and October, at 5 research points located in Szczepanowice, Janowice, Wróblowice, Lusławice, and Zakliczyn. Twenty-nine specimens of bleak were provided by members of the Polish Angling Association (PZW — Polski Związek Wędkarski), from catches performed in the second half of July. The zinc concentration in the samples was determined by inductively coupled plasma atomic emission spectrometry at a wavelength of 206.200 nm, conducted on an Optima 7600 DV spectrometer made by Perkin Elmer. The limit of detection for zinc was 5.9 μg · dm-3. High concentrations of zinc in the water were found, indicative of anthropogenic enrichment of the river with this element. The zinc content in the analysed sediments was below the geochemical background value for bottom sediments in Poland. Zinc concentrations in the fish varied within a range from 152.6 to 352 mg ∙ kg-1 in the skin, from 158.8 to 271.3 mg ∙ kg-1 in the bones, from 27.32 to 97.35 mg ∙ kg-1 in the muscles, and from 82.39 to 230.7 mg ∙ kg-1 in the liver. The mean content of zinc in individual organs decreased in the following order: skin > skeleton > liver > muscles. Zinc concentrations in individual organs of the fish were comparable with the ones determined eslewhere in environments polluted with this element.
In this paper we examine the mineralogy of sediments and the distribution of chromium between par­ticle-size classes, and describe the contaminated sediment distribution in the upper Dunajec River. No relationship between grain-size classes and Cr concentration was found in the contaminated sediments, but chromium concentration increased with decreasing grain-size in non-contaminated sediments. Fragments of leather were identified in the bottom sediments in proximity to wastewater discharges from tanneries. At each of the contaminated sites, Cr is enriched in the organic fraction of the uppermost surface sediments, while the clay fraction is relatively poor in this metal. The contamination factor in sediments is about 100.
W celu ograniczenia erozji dna dolnego odcinka Dunajca zaprojektowano dwa stopnie wodne. Dokonano wstępnej analizy wpływu tych obiektów na dynamikę przepływu rzeki. W analizie wzięto pod uwagę energetyczne wykorzystanie powstałych spadów, ocenę stabilności koryta oraz zachowanie warunków bytowania ichtiofauny.
In the Rożnów Reservoir the taxonomic composition of benthic insect larvae assemblages became distinctly poorer. Among midges the genus Procladius still dominated with a usually small participation of Chironomini and other subgroups. In the polluted River Dunajec above and below the reservoir larvae of the genus Cricotopus (Orthocladiinae) occurred in the greatest numbers. In the Czchów Reservoir, its tributary Łososina, and in the Dunajec below the dam the insect fauna was more diverse, particularly Chironomidae, Ephemeroptera, and Trichoptera. The structure of the benthos assemblages chiefly depended upon the kind of bottom, the current velocity, and the physico-chemical parameters of the water.
Praca dotyczy zanieczyszczeń wód i ścieków na terenie Podhala związkami chromu pochodzącego z rzemiosła garbarskiego. Głównym ośrodkiem podhalańskiego rzemiosła garbarskiego jest miasto i gmina Nowy Targ. Na tym terenie zlokalizowanych jest kilkaset zakładów kuśnierskich. Często zanieczyszczone ścieki garbarskie z tych zakładów nie trafiają do oczyszczalni ścieków w Nowym Targu, lecz są wprowadzane bezpośrednio do kanalizacji i wód powierzchniowych, o czym świadczą badania wykazujące zanieczyszczenie związkami chromu wód zlewni górnego Dunajca późną jesienią i zimą – w okresie, kiedy to produkcja w zakładach garbarskich osiąga maksimum. W zlewni Dunajca, zarówno w cieku, jak i w Zbiorniku Czorsztyńskim dochodzi wtedy do okresowej kumulacji chromu w osadach dennych.
Pierwsza strona wyników Pięć stron wyników wstecz Poprzednia strona wyników Strona / 1 Następna strona wyników Pięć stron wyników wprzód Ostatnia strona wyników
JavaScript jest wyłączony w Twojej przeglądarce internetowej. Włącz go, a następnie odśwież stronę, aby móc w pełni z niej korzystać.