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Assessing the impact of climate change on discharge in the Horyn River basin by analyzing precipitation and temperature data

Lobodzinskyi Oleksandr, Vasylenko Yevheniia, Koshkina Olha, Nabyvanets Yurii

Meteorology Hydrology and Water Management. Research and Operational Applications

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2023

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Vol. 11, Iss. 1

93--106

EN

It is important to investigate the hydrological consequences of current climate change. Hydrological responses to climate warming and wetter conditions include changes in discharge (frequency, amplitude, and volume). This paper describes current climate change and its impact on hydrological flow within the Horyn River basin. Daily air temperature and precipitation data obtained from the 17 meteorological stations located in and nearby the Horyn River basin, in combination with hydrological data (such as daily water discharges obtained from 9 water gauges), were used for the analysis of climate variability and its hydrological consequences. Analyses of meteorological variables and water discharges are crucial for the assessment of long-term changes in the river regime. Thiessen polygons were used to determine the area of influence of assigned specific meteorological stations, which affect the river’s catchments within the Horyn River basin. As a result of the trend analysis, it was observed that discharge within the Horyn River basin decreased over time. These results were congruent with the trends of precipitation data and air temperature data of the stations determined by the Thiessen polygons and basin boundaries. To understand current changes in the daily flow in the basin, changes in air temperature and precipitation for the period 1991-2020 were compared with the period of the climatic norm (1961-1990). A similar analysis was done for daily water discharges. Increasing air temperature and decreasing precipitation in the current period led to a significant decrease in discharges in the Horyn River basin, especially during the spring flood period.

2

Mathematical modelling of rainfall runoff from small catchments of the northwest coast of the Black Sea

Moniushko M., Daus M., Zakharova M.

Meteorology Hydrology and Water Management. Research and Operational Applications

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2015

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Vol. 3, Iss. 1

45--50

EN

This article is devoted to the use of a mathematical model of a flood runoff for calculating rainfall runoff hydrographs from small catchments of the northwest coast of the Black Sea. The described model was tested and applied for the following catchments located in various geographical conditions, with various amounts of initial data: experimental catchments in Zacarpathian, the northwest of the Black Sea region – Ukraine and the Republic of Moldova, small catchments of the northern part of Vietnam, etc. This work was carried out on the basis of Moldavian Water-Balance Station databases. The development of a complex approach to a mathematical simulation of the formation of the processes of rain floods from small catchments is also given further investigation in this article. A brief description of the structure of a flood runoff spatial model from small catchments then provided. As well as this, the advantages of using radiolocation measurement of rainfall in the mathematical modeling of the formation of a flood runoff are shown. The results of construction runoff hydrographs confirm the possibility of applying this spatial model with the use of radar information. The optimization of model parameters was made with the data of 123 floods. The values of the quality criterion S/σ turned out not to exceed the value 0.8 in 81% of the considered cases of floods.

3

Long-term trends of groundwater runoff changes of the Volyn Polissia Rivers (Ukraine)

Grebin V., Solovey T.

Biuletyn Państwowego Instytutu Geologicznego

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2013

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nr 456 Hydrogeologia z. 14/1

179--184

EN

In this study the contribution of individual sources of river flow Volyn Polissia (Ukraine) by base flow separation techniques for two specific periods: 1961–1990, and 1991–2010, the multiplicity of 1961–1990 was considered as representative to obtain reliable values climate standards. The calculations indicate significant changes in the structure of river outflow. The share of power in the downstream river snow fell from 47 to 28%, and has increased the role of groundwater. Average annual runoff into rivers Polesie groundwater runoff in the Volyn Ukraine for the period 1961–1990 was approximately 38% of the total outflow. Today (1990–2010 onwards) component supply groundwater runoff rose about 1.4 times and is 53%.

PL

W pracy określono udział poszczególnych źródeł w zasilaniu rzek Polesia Wołyńskiego (Ukraina) za pomocą metody genetycznego podziału hydrogramu odpływu dla dwóch charakterystycznych okresów: 1961–1990 i 1991–2010. Wielolecie 1961–1990 uznano za reprezentatywne do uzyskania miarodajnych wartości normy klimatycznej. Przeprowadzone obliczenia świadczą o istotnych zmianach w strukturze odpływu rzecznego. Udział zasilania śnieżnego w odpływie rzecznym zmniejszył się z 47 do 28%, natomiast została wzmożona rola wód podziemnych. Średni roczny odpływ podziemny do rzek Polesia Wołyńskiego na obszarze Ukrainy dla okresu 1961–1990 wynosił około 38% odpływu całkowitego. Współcześnie (1990–2010) składowa zasilania podziemnego rzek wzrosła około 1,4 razy i wynosi 53%.

4

Wpływ hydrogramu fali powodziowej na zachowanie się wałów przeciwpowodziowych

Grodecki M.

Czasopismo Techniczne. Środowisko

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2011

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R. 108, z. 3-Ś

53--57

PL

W artykule przedstawiono wyniki symulacji numerycznych zachowania się wałów przeciwpowodziowych w trakcie przejścia wezbrań o różnych hydrogramach. Wykazano, iż kształt hydrogramu fali powodziowej w znaczny sposób wpływa na uzyskane wielkości wycieków oraz stateczność wału.

EN

In this paper results of numerical simulations of a flood embankments behavior during floods with different hydrographs are presented. It’s proved that shape of the hydrograph can affect the leakage quantity and stability of the embankment.

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Zastosowanie modelu Singha i Quiroga do prognozowania hydrogramu wypływu wody przez prostokątną wyrwę w zaporze ziemnej

Kubrak J., Szydłowski M.

Przegląd Naukowy Inżynieria i Kształtowanie Środowiska

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2002

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Vol. 11, No. 1

240--250

EN

The earth dams breach erosion is analyzed using dimensionless analytical Solutions for rectangular breach given by Singh and Quiroga (1988). Data for the historical failure of Teton Dam are used to test these solutions. The calculated changes of breach bottom elevation with time are used for prediction breach outflow hydrograph. The one-dimensional unsteady flow model in reservoir was applied for prediction breach outflow hydrograph.