Wyniki wyszukiwania - Biblioteka Nauki

1

The impact of climatic conditions of spring flood formation on hydrograph shape of the Desna River

100%

Khrystyuk B. , Gorbachova L. , Koshkina O.

Meteorology Hydrology and Water Management. Research and Operational Applications

|

2017

|

tom Vol. 5, Iss. 1

63--70

EN

Climatic factors are the most important of all the factors that influence the hydrograph shape of a river; this is because they are dynamic in space and time. The presence of hydrographs with a similar shape in long-term observation series of water runoff indicates that from time to time in the catchment of a river the same conditions of water runoff formation repeat. This is due to the cyclicity of climatic and – as a consequence – hydrological processes. The classification of hydrographs based on the similarity of their shapes on the Desna River (observation period 18852010) was carried out using the geometrical similarity criterion (ρ) and the average Euclidean distance between values of hydrograph pairs (η). 41 classes of hydrographs, which included from 1 to 6 hydrographs, were obtained. Among them were determined 12 classes with low probability, 9 classes with medium probability and 20 classes with high probability. An analysis of the conditions of hydrograph formation for each of the identified classes was performed for the following factors: the sums of daily air temperatures and precipitation during the period of positive air temperature (from July) and the period of negative air temperatures, and also during the period of temperature transition through 0ºC up to the peak discharges, index of depth of soil freezing, index of snow water equivalent, index of soil moisture content, and index of snowmelt. In general, hydrographs which are included in one class have similar climatic conditions to those of water runoff formation. However, in some cases, a combination of different values and dynamic factors can lead to the formation of similar hydrograph shapes.

2

The impact of climatic conditions of spring flood formation on hydrograph shape of the Desna River

75%

Khrystyuk B. , Gorbachova L. , Koshkina O.

Meteorology Hydrology and Water Management. Research and Operational Applications

|

2017

|

tom 05

|

nr 1

EN

Climatic factors are the most important of all the factors that influence the hydrograph shape of a river; this is because they are dynamic in space and time. The presence of hydrographs with a similar shape in long-term observation series of water runoff indicates that from time to time in the catchment of a river the same conditions of water runoff formation repeat. This is due to the cyclicity of climatic and – as a consequence – hydrological processes. The classification of hydrographs based on the similarity of their shapes on the Desna River (observation period 1885- 2010) was carried out using the geometrical similarity criterion (ρ) and the average Euclidean distance between values of hydrograph pairs (η). 41 classes of hydrographs, which included from 1 to 6 hydrographs, were obtained. Among them were determined 12 classes with low probability, 9 classes with medium probability and 20 classes with high probability. An analysis of the conditions of hydrograph formation for each of the identified classes was performed for the following factors: the sums of daily air temperatures and precipitation during the period of positive air temperature (from July) and the period of negative air temperatures, and also during the period of temperature transition through 0ºC up to the peak discharges, index of depth of soil freezing, index of snow water equivalent, index of soil moisture content, and index of snowmelt. In general, hydrographs which are included in one class have similar climatic conditions to those of water runoff formation. However, in some cases, a combination of different values and dynamic factors can lead to the formation of similar hydrograph shapes.

3

Studies on ground water dynamics in a protected part of the Narew River valley

51%

Mioduszewski W. , Kowalewski Z. , Slesicka A.

Journal of Water and Land Development

|

1997

|

nr 01

EN

Field studies and numerical calculations have been performed to find the relationship beetwen ground and surface water levels in lower part of the Narew National Park. This part of the valley is under the influence of regulated stretch of the river. The studies show that the ground water level on the protected area depends on both surface water level in the river and old river beds and on atmospheric conditions (rainfall and evapotranspiration). Some proposals for water management in this area are given.

PL

Badania dynamiki wód gruntowych w chronionej części doliny rzeki Narew Zachowanie walorów przyrodniczych doliny rzeki w Narwiańskim Parku Narodowym w dużym stopniu zależy od utrzymania wysokiego uwilgotnienia zalegających tu gleb organicznych. Wykonana regulacja rzek spowodowała obniżenie wód gruntowych w dolnej części Parku, pomimo piętrzenia wody na jazie Rzędziany. Wykonane zostały badania terenowe i obliczenia numeryczne do ustalenia zależności pomiędzy poziomem wód powierzchniowych a zwierciadłem wód gruntowych. Badania wykazały, że poziom wód gruntowych zależy nie tylko od wysokości piętrzenia wody na jazie, ale w dużym stopniu również od warunków atmosferycznych (opadów i ewapotranspiracji). Do utrzymania wysokiego uwilgotnienia gleb torfowych niezbędne są zmiany w eksploatacji jazu Rzędziany. Proponuje się ustawienie klapy jazu na stałym poziomie, a wówczas zwierciadło wody w rzece będzie się wahało w zależności od wielkości przepływu, przekraczając często ustaloną obecnie rzędną piętrzenia 100,70 m npm. Badania wskazały również na potrzebę zachowania i stymulowania wystąpienia zalewów wiosennych doliny.

4

Simulation of the early spring floods from a reservoir

51%

Jedryka E.

Journal of Water and Land Development

|

1997

|

nr 01

EN

The paper presents an analysis of the possibility to facilifete floods in the Narew National Park from the Siemianówka Reservoir. The analysis has been based on a series of calculations made with the use of simulation-optimization model of water management in the Upper Narew. Considering various reservoir parameters, amounts and periods of floods and the values of typical flow rates, a possibility of reservoir utilization to improve water relations in a marshland valley is presented.

PL

Symulowanie zalewów wczesnowiosennych przy udziale zbiornika W artykule przedstawiono analizę możliwości wspomagania zalewów na terenie Narwiańskiego Parku Narodowego przy udziale zbiornika Siemianówka. Analizę tę przeprowadzono na podstawie serii obliczeń wykonanych przy użyciu modelu symulacyjno-optymalizacyjnego gospodarki wodnej Górnej Narwi. Wariantując wametry zbiornika, wielkości i terminy zalewów oraz wielkości przepływów charakterystycznych, przedstawiono możliwości wykorzystania zbiornika retencyjnego dla poprawy stosunków wodnych doliny łęgowej.