Water Resources Management

, Volume 31, Issue 4, pp 1089–1103 | Cite as

A New Approach for Trend Assessment of Annual Streamflows: a Case Study of Hydropower Plants in Serbia

  • Milan Stojković
  • Srđan Kostić
  • Stevan Prohaska
  • Jasna Plavšić
  • Vesna Tripković
Article

Abstract

The authors propose a new approach for trend assessment that takes into account long-term periodicity of annual flows. In particular, analysis is performed of annual flows recorded at the locations of 30 operating and designed hydropower plants (HPPs) in Serbia, in order to assess the current and future water availability for hydropower generation. The composite annual trend is determined by sliding a fixed time window of 30 years along the observed time series with a one-year time step. Such a linear moving window (LMW) approach enables the identification of the flow trend as a median of all values for each time step. Significant trend harmonics are determined using discrete spectral analysis. The results show an alternation of upward and downward trend phases of different durations, namely: 67–87, 33–43 and 21–29 years. On the other hand, the results of the Mann-Kendall test indicate a monotonic downward trend at the studied sites in the Drina River Basin, while statistically insignificant trends are noted at other river basins. The Mann-Kendall test with the Theil-Sen estimator also implies a downward and statistically insignificant flow trend after the observed period, whereas the LMW approach indicates a probable trend increase at all the examined sites. The proposed approach can be used to predict annual flows in order to establish long-term water management plans at hydropower plants.

Keywords

Annual flow trend Long-term periodicity Hydropower plant Water management plans South-east European rivers 

Notes

Acknowledgements

This study was supported by the Ministry of Education, Science and Technological development of the Republic of Serbia as a part of the project TR 37013 "System development to support optimal sustainability of the high dams in Serbia, 2010-2016".

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Copyright information

© Springer Science+Business Media Dordrecht 2017

Authors and Affiliations

  • Milan Stojković
    • 1
  • Srđan Kostić
    • 1
  • Stevan Prohaska
    • 1
  • Jasna Plavšić
    • 2
  • Vesna Tripković
    • 1
  1. 1.Institute for Development of Water Resources “Jaroslav Černi”BelgradeSerbia
  2. 2.University of Belgrade Faculty of Civil EngineeringBelgradeSerbia

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