Wyniki wyszukiwania

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Stability of the water levels regime on the lakes in Poland

100%

Wrzesinski D., Plewa K.

Badania Fizjograficzne nad Polską Zachodnią. Seria A: Geografia Fizyczna

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2016

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tom 67

2

Assessing the suitability of habitat for wintering Siberian cranes (Leucogeranus leucogeranus) at different water levels in Poyang lake area, China

100%

Chen B., Cui P., Xu H., Lu X., Lei J., Wu Y., Shao M., Ding H., Wu J., Cao M., Liu G.

Polish Journal of Ecology

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2016

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tom 64

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nr 1

Poyang lake area (1000–3246 km²) is the most important wintering ground for the globally critically endangered Siberian crane (Leucogeranus leucogeranus). More than 98% of the Siberian crane population overwinters in Poyang lake area. Remote-sensing and the spatial analysis tools of geographic information system (GIS) technology were used to assess the suitability of the habitat for wintering Siberian cranes in Poyang lake area at different water levels. The results demonstrated that as the water level increased within the range of 7.93–12.16 m, the area of unsuitable habitat increased gradually, but the areas of good, fair and poor habitat decreased. When the water level reached 12.16 m, good habitat for Siberian cranes covered an area of only 3005 ha, which is only 0.93% of the area of the total lake area. When human disturbance factors including vehicles, fishing and construction activities were added to the analysis of the current distribution of Siberian crane habitat, the results again indicated that the area of good habitat decreased with an increase in water level within the range of 7.93–12.16 m. Additionally, the areas of good habitat occurred primarily in the region of two national nature reserves, which are the Poyang Lake National Nature Reserve and the Nanjishan National Nature Reserve. Our study provides important data and an important theoretical basis for water level management and nature reserve construction in Poyang lake area.

3

Interaction between surface water and groundwater

100%

Skalova J., Klementova E.

Zeszyty Naukowe Akademii Rolniczej w Krakowie. Inżynieria Środowiska

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2001

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tom 21

The paper presents the changes of groundwater table on the low section of the Hron river in Tlmače-Kálna area. The data used for analyses of ground water level and for the determination of the relationships between groundwater level and precipitation and between groundwater level and water level in the Hron river were collected in 1963-1997 from the sensing heads of Slovak Hydrometeorology Institute (SHI) situated along the Hron River in this area.

4

Aquatic chemistry in correlation with water level in the Kasprowa Niznia Cave [Tatra Mts]

100%

Dumnicka E., Galas J., Wojtan K.

Acta Hydrobiologica

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1995

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tom 37

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nr 3

The values of conductivity, total hardness, alkalinity, total residue, total fixed residue, and calcium concentration measured at the times of low water level in the Kasprowa Niżnia Cave were distinctly higher than those measured during high water level. Silicate values had the opposite pattern. Means of the above chemical factors were significantly different (p < 0.05 or p < 0.005). No dependence between the remaining parameters measured and water level in the studied cave was observed.

5

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Impact of different irrigation water levels on yield and some quality parameters of lettuce (Lactuca sativa L. var. Longifolia cv.) under unheated greenhouse condition

84%

Senyigit U., Kaplan D.

Infrastruktura i Ekologia Terenów Wiejskich

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2013

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nr 2/IV

The experiment was carried out to determine the effects of different irrigation water levels on yield and some quality parameters of lettuce (Lactuca sativa L. Var. Longifolia cv.) under greenhouse conditions. Irrigation water was applied through drip irrigation method with 7 days interval during the total growing season. Irrigation treatments consisted of six different water levels (I1: non-irrigation, I2: 25 %, I3: 50 %, I4: 75 %, I5: 100 % and I6: 125 % of cumulative evaporation measured from Class A pan). The amount of irrigation water ranged between 0 and 106.3 mm among the treatments. Evapotranspiration (ET) values varied from 69.1 to 158.5 mm for the treatments. The highest yield was obtained from the I5 followed by I4. A significant polynomial relation (R2=0.77) was obtained between the yield and irrigation water, and linear relation (R2=0.99) was obtained between the yield and ET. This indicated that when irrigation water increased, yield also increased to a certain point. However, when the amount of irrigation water exceeded the plant water requirement, lettuce yield decreased. Yield response factor (Ky) was determined as 1.97. Since Ky ˃ 1, lettuce was very sensitive to water deficiency. In addition, the highest water use efficiency (WUE) and irrigation water use efficiency (IWUE) values were calculated in the I5 with 0.60 t ha.mm-1 and 0.96 t ha.mm-1 respectively. The best plant quality parameters which were plant weight (239.11 g), plant height (26.30 cm), plant diameter (44.82 cm), root weight (17.31 g), root length (9.02 cm), root diameter (10.04 cm) and leaf number (49) were also obtained in I5. As a result, it was suggested that I5 can be the most appropriate irrigation water level for lettuce with higher WUE, IWUE, yield and quality under greenhouse conditions.

6

84%

Alemayehu T., McCartney M., Kebede S.

International Journal of Ecohydrology and Hydrobiology

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2010

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tom 10

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nr 2-4

The water resources of the Lake Tana catchment are largely untapped. Currently, water resource development is being promoted to stimulate economic growth. This study utilized the WEAP model to determine the likely impact of a number of possible development scenarios on lake water levels. For each scenario, the model was used to simulate water demand in three sectors (i.e. irrigation, hydropower and downstream environmental flows) over a 36-year period of varying flow and rainfall. The simulation results revealed that if all the planned development occurs on average 2198 GWhy-1 power could be generated and 677 Mm3 y-1 of water supplied to irrigation schemes. However, the mean annual water level of the lake would be lowered by 0.44 meters. As well as adverse ecological impacts this would have significant implications for shipping and the livelihoods of local people.

15

The ecological amplitude of Acorus calamus young shoots under water level gradient

84%

Cao Y., Guo Z., Yang Y., Wang G., Xie Z.

Polish Journal of Ecology

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2015

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tom 63

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nr 4

This paper analysed the influence of the gradient of water levels (-54–120 cm) on Acorus calamus (A. calamus) young shoots in terms of their growth characteristics (germination rate, basal stem, height and biomass), leaf characteristics (number, area and moisture content), chlorophyll (chl) fluorescence parameters (Fv/ Fm, ETR, qP and qN) and other indicators. Based on a Gaussian model, we determined and quantified the response relationship between A. calamus young shoots and water level. The results showed that the ecological amplitude of water level for A. calamus young shoots was -52.3−141.8 cm, and the optimum range was -3.5−69.3 cm; a variety of indicators suggested that the optimum depth for A. calamus young shoots was from18.8 cm to 49.6 cm. The A. calamus seedling growth characteristics which were sensitive to changes in the water level were the germination rate and biomass. The germination rate was more sensitive to the submergence water depth, but the biomass was obviously influenced by the groundwater depth. Therefore, the A. calamus could be a suitable species for ecological restoration of land/inland water ecotones in lakes, rivers and reservoirs.

16

Zastosowanie sztucznych sieci neuronowych do predykcji szeregow czasowych stanow wod i przeplywow w rzece

84%

Krzanowski S., Walega A.

Acta Scientiarum Polonorum. Formatio Circumiectus

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2007

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tom 06

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nr 4

59-73

17

The influence of water use intensity on nitrate concentration in shallow well water

84%

Rutkoviene V., Cesoniene L., Kutra S.

Polish Journal of Environmental Studies

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2009

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tom 18

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nr 3

435-442

Water enters shallow wells from shallow resources of groundwater, therefore the groundwater is especially susceptible to chemical and microbiological pollution. The aim of this study is to determine the effect of intensity of shallow well usage on the nitrate concentration in water. It has been found that concentrations of nitrate ions in the water of shallow wells depends on the quality of water in the basin feeding the well, processes in the water and well depth. Concentration of nitrate ions in newly filled water is higher than that in well water, but due to chemical and biochemical reactions it decreases rather fast and in most cases becomes lower. The rate at which the drained wells refill is different. Re-establishment of the same amount of water ranges between two and five days. In the beginning because of big difference in levels, the rate is higher, and then it slows down and asymptotically approaches the main level. An average rate of filling-up makes 3% of well volume per day, ranging from 7% the first day to 1% the fifth day. The nitrate concentration decreases approximately to eight days at a rate of 8 mg l⁻¹/day, and after the eighth day it increases at a rate of 12 mg l⁻¹. Changes of concentration of nitrates in the top layer of water could be summarized as the reaction of the first order. Mathematical patterns of well refilling and changes in nitrates determine the limits of the nitrate concentration changes in water, though they are not precisely adapted to a separate well.

18

Seasonal and annual probabilistic forecasting of water levels in large lakes (case study of the Ladoga Lake)

84%

Myakisheva N., Gaidukova E., Shanochkin S. V., Batmazova A. A.

International Letters of Natural Sciences

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2021

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tom 82

19

The evolution of the southern Baltic coastal zone

84%

Mojski J. E.

Oceanologia

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2000

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tom 42

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nr 3

This article discusses the formation and evolution of the coastal zone of the southern Baltic from the decay of the last Scandinavian ice-sheet, which took place some 14 ka BP. During the first 4 ka, the shores of the then southern Baltic basins were shaped under the dominant influence of considerable variations in water level and the young, post-glacial topography emerging from under the ice. Later, until the beginning of the Atlantic transgression, the shores were also unstable, because sea level changes resulting from periodic connections with the World Ocean followed one another in rapid succession. Since that transgression destroyed much of the former shoreline, its reconstruction is at best highly problematical, and in some places no longer possible. The maximum range of the Litorina Sea gave rise to a coastal zone that in many places is to this day quite conspicuous in the local topography and sediments. During the last 4 ka, the shoreline has changed relatively little, thus the present shoreline is largely redolent of the original one. In the coming 100 years or so, the abrasion of the cliffs along the southern Baltic shore will probably accelerate, as will the retrogradation of certain sections of the shoreline, with the result that the shoreline will be less of a straight line than it is at present. Land up to a height of 1 m above sea level will be inundated. The greatest changes in the lie of the shoreline are to be expected in the River Wisła (Vistula) delta and around the Zalew Szczeciński (Oderhaff, Szczecin Lagoon).

20

Seasonal and multiannual changes of water levels in lakes of Northeastern Poland

84%

Gorniak A., Piekarski K.

Polish Journal of Environmental Studies

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2002

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tom 11

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nr 4

Seasonal and multiannual hydrological changes were analysed in seven lakes of northeastern Poland on the basis of a 40-year series of everyday observations of the water level in the years 1961-2000. In the unmodified hydrological lakes occurs an unimodal cycle of variation in the water level with a spring maximum, whose magnitude depends on atmospheric precipitation in the form of snow in the period December- March. In lakes with hydrology transformed by man, seasonal water level changes depend on their economic function in the catchment. An anthropogenic increase in the amplitude of the varying water level in lakes is the factor intensifying the eutrophication of water bodies. Multiannual cycles of variation in lake levels take different spans of time depending on hydrological characters of the lakes.

Ograniczanie wyników

Stability of the water levels regime on the lakes in Poland

Assessing the suitability of habitat for wintering Siberian cranes (Leucogeranus leucogeranus) at different water levels in Poyang lake area, China

Interaction between surface water and groundwater