Analysis of trends of low flow in river stations in eastern Slovakia

Zeleňáková, Martina; Purcz, Pavol; Soľáková, Tatiana; Demeterová, Beata

doi:10.11118/actaun201260050265

Cited by 10 publications

(5 citation statements)

References 6 publications

(6 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…If only the results of an analysis for the period 1951-2020 are considered, the statistical values of the Mann-Kendall and Sen tests do not indicate any substantial changes in flow values for most rivers. Similar results have been obtained by Zele ňáková et al [70] who adopted a similar approach in their study. A wider perspective of changes in flow characteristics and climatic conditions over the years is provided by the multitemporal analysis of [59,71], so the latter should be preferred when analysing long-term changes in hydrometeorological characteristics [72].…”

Section: Discussionsupporting

confidence: 90%

Directions and Extent of Flows Changes in Warta River Basin (Poland) in the Context of the Efficiency of Run-of-River Hydropower Plants and the Perspectives for Their Future Development

Sojka

2022

Energies

View full text Add to dashboard Cite

This paper presents changes in the flow of 14 rivers located in the Warta River basin, recorded from 1951 to 2020. The Warta is the third-longest river in Poland. Unfortunately, the Warta River catchment area is one of the most water-scarce regions. It hosts about 150 hydropower plants with a capacity of up to 5 kW. The catchment areas of the 14 smaller rivers selected for the study differ in location, size, land cover structure and geological structure. The paper is the first study of this type with respect to both the number of analyzed catchments, the length of the sampling series and the number of analyzed flow characteristics in this part of Europe. The analysis of changes in the river flows was performed with reference to low minimum, mean and maximum monthly, seasonal and annual flows. Particular attention was paid to 1, 3, 7, 30 and 90-day low flows and durations of the flows between Q50 and Q90%. In addition, the duration of flows between Q50 and Q90% were analysed. Analysis of the direction and extent of particular flow types was performed by multitemporal analysis using the Mann–Kendall (MK) and Sen (S) tests. The analysis of multiannual flow sequences from the years 1951–2020 showed that the changes varied over the time periods and catchments. The most significant changes occurred in the low flows, while the least significant changes occurred in the high flows. From the point of view of the operation of the hydropower sector, these changes may be unfavourable and result in a reduction in the efficiency of run-of-river hydropower plants. It was established that local factors play a dominant role in the shaping of river flows in both positive and negative terms, for the efficiency of the hydropower plants.

show abstract

Section: Discussionsupporting

confidence: 90%

Directions and Extent of Flows Changes in Warta River Basin (Poland) in the Context of the Efficiency of Run-of-River Hydropower Plants and the Perspectives for Their Future Development

Sojka

2022

Energies

View full text Add to dashboard Cite

show abstract

“…Water supply system Paljevštica exists from 1971, but in the early 1980s, it was significantly expanded by joining other settlements of the Brus municipality to this water system (settlements Kobilje, Paljevštica, the part of Brus around industrial zone etc.). Zelenakova et al (2012) state that the most frequent anthropogenic cause of decrease of flow value, besides the construction of reservoirs, is the use of the water in the river's sources for water supply. In the period 1961-1985, Rasina River had about 1.36 times more water per year, than in the period 1985-2009(Stričević, 2015.…”

Section: Fig 3 Graphical View Of Trends and Points Of Change For Twmentioning

confidence: 99%

Trends of mean annual river discharges in the Zapadna Morava river basin

Langović

Manojlović

Cvorovic³

2017

B SERBIAN GEOGRAPHIC

View full text Add to dashboard Cite

Zapadna Morava River basin covers a surface of 15850 km2, which is approximately 18% of the territory of the Republic of Serbia. In its basin, 38 active surface stations are registered. The goal of this paper is the trend analysis of the mean annual river discharges in the Zapadna Morava River basin and their noticing in a longer series of time, as well as determining their intensity. Fifty years period of time (1965 - 2014) is taken for a time series. Because there is no empirical data for mean annual discharge values for all stations for the given period, the number of the hydrological stations, which are processed in this paper, is reduced to 21. Mann-Kendall test has been used for noticing the trend, Sen test has been used for estimating the curves inclinations of the linear trend, while Pettitt?s test has been used for determining the turning point of change. Also, classification of the years by water richness has been performed in this paper in order to determine wet and dry periods. For the needs of identification of medium watery, wet and dry years, the combined method has been used on the data examples from representative stations in the basin. Based on the processed data and the obtained results, it has been established that the most rivers in the basin of the Zapadna Morava River have a slightly decreasing trend of the flow values, whereby the change of the trend is not significant. On the most rivers, the change period has begun in the early eighties of the past century. On a large number of profiles, the watery period was appearing in the beginning of eighties, while the dry season is characteristic for the period from 1990 to 1994.

show abstract

“…The most popular test for assessing the homogeneity of drought characteristics, recommended by, among others, the WMO (2009) is the Mann–Kendall test [ 55 , 56 , 57 ]. In the paper, the Mann–Kendall test with the Hamed and Rao correction for autocorrelation was used for assessing the stationarity of the time series of duration T max and volume V max of annual maximum droughts.…”

Section: Methodsmentioning

confidence: 99%

The Risk of Extreme Streamflow Drought in the Polish Carpathians—A Two-Dimensional Approach

Baran-Gurgul

2022

IJERPH

View full text Add to dashboard Cite

Poland has relatively small water resources compared to other European countries. Droughts are a characteristic feature of the Polish climate; however, recent years have been particularly warm, causing longer and more severe droughts, including streamflow droughts. The most unfavourable streamflow droughts, considering the economic or social (including health-related) consequences, are the longest and/or the ones with the largest volumes. Such prolonged and severe droughts may constitute a natural disaster threatening public health. The main aim of this article was to define the spatial variability of the annual maximum streamflow drought in the Polish Carpathians and the risk of the maximum streamflow drought of a duration and volume exceeding the given value occurring in this region. This was conducted based on a 30-year time series of daily flows in selected gauging cross sections on rivers in the Polish Carpathians. One- and-two-dimensional probability distributions (utilising a copula function) of the two most important maximum streamflow drought characteristics were identified, specifically duration and volume, which, in consequence, led to identifying the maximum streamflow droughts of a given return period (a given risk level). Maps of maximum streamflow drought hazard were developed and understood as spatial distributions of the maximum streamflow drought frequency of duration and volume exceeding the annual given values. Analysis of the maps allowed for the selection of areas/basins being more or less at risk of extreme annual streamflow drought of a duration and/or volume exceeding the given value.

show abstract

Analysis of trends of low flow in river stations in eastern Slovakia

Cited by 10 publications

References 6 publications

Directions and Extent of Flows Changes in Warta River Basin (Poland) in the Context of the Efficiency of Run-of-River Hydropower Plants and the Perspectives for Their Future Development

Directions and Extent of Flows Changes in Warta River Basin (Poland) in the Context of the Efficiency of Run-of-River Hydropower Plants and the Perspectives for Their Future Development

Trends of mean annual river discharges in the Zapadna Morava river basin

The Risk of Extreme Streamflow Drought in the Polish Carpathians—A Two-Dimensional Approach

Contact Info

Product

Resources

About