Low-flow analysis of streamflows in Slovenia using R software and lfstat package
- Authors: Manca Petek, Mira Kobold, Mojca Šraj
- Citation: Acta hydrotechnica, vol. 27, no. 46, pp. 13-28, 2014.
- Abstract: Understanding and predicting low flows are among the most important tasks of effective water management. Due to the unfavourable distribution of rainfall throughout the year, drought and associated water scarcity have been a great problem also in Slovenia in recent years. For accurate and efficient analysis of low flows it is necessary to analyse several indices; furthermore the results of such analyses should be properly evaluated. In the article main low-flow indices are presented and calculated for 55 gauging stations in Slovenia. Among the presented indices are base flow index, some low-flow statistics such as mean annual minima of n days, mean, 70-, 90-, and 95-percentile flow; the seasonality index, seasonality ratio and recession analysis together with the recession constant. The R package lfstat was used for calculations and analyses. The results are presented both analytically and graphically and also correlation analysis was carried out to indicate the relationship among the calculated indices.
- Keywords: low flows, low flow indices, base flow index, statistics, seasonality, recession curve
- Full text: a46mp.pdf
- References:
- ARSO (2014). Arhiv površinskih voda. http://vode.arso.gov.si/hidarhiv/pov_arhiv_tab.php (Pridobljeno 15. 6. 2014.).
- Beck, H.E, van Dijk, A.I.J.M., Miralles, D.G., de Jeu, R.A.M., Bruijnzeel, L.A., McVicar, T.R., Schellekens, J. (2013). Global patterns in base flow index and recession based on streamflow observations from 3394 catchments, Water Resources Research 49(12), 7843–7863.
- Beran, M., Rodier, J.A. (1985). Hydrological aspects of drought: a contribution to the International Hydrological Programme. UNESCO, Paris, 149 p.
- Bezak, N., Horvat, A., Šraj, M. (2015). Analysis of flood events in Slovenian streams, Journal of Hydrology and Hydromechanics 63(2), 134–144.
- Burn, D.H. (1997). Catchment similarity for regional flood frequency analysis using seasonality measures, Journal of Hydrology 202(1-4), 212–230.
- Direktiva 2000/60/ES Evropskega parlamenta in Sveta z dne 23. oktobra 2000. (2000). http://eur-lex.europa.eu/legal-content/EN/TXT/?uri=CELEX:32000L0060 (Pridobljeno 4. 4. 2015.)
- Fleig, A. K., Tallaksen, L. M., Hisdal, H., Demuth, S. (2006). A global evaluation of streamflow drought characteristics, Hydrology and Earth System Sciences, 10(4), 535–552. http://www.hydrol-earth-syst-sci.net/10/535/2006/hess-10-535-2006.pdf (Pridobljeno 24. 10. 2014.)
- Hisdal, H., Tallaksen, L.M. (2000). Drought Event Definition. V: Hisdal, H. (ur.), Tallaksen, L.M. (ur.). Techical Report to the ARIDE project No. 6. University of Oslo, Department of Geophysics, 41 p.
- Hrvatin, M. (1998). Pretočni režimi v Sloveniji, Geografski zbornik 38, 59–87.
- IZVRS (2014). Ukrep DDU26. http://www.izvrs.si/pregledovalnik_vtpv/maske/DDU/DDU26.pdf (Pridobljeno 19. 3. 2015.)
- Janža, M. (2006). Analiza odvisnosti indeksa baznega odtoka od lastnosti povodja. Geografski informacijski sistemi 2005–2006, Ljubljana, Geografski inštitut Antona Melika ter inštitut za antropološke in prostorske študije ZRCSAZU, 103–111.
- Kobold, M., Brilly, M. (1994). Low flow discharge analysis in Slovenia. FRIEND '97 – Regional Hydrology: Concepts and Models for Sustainable Water Resource, 119–131.
- Koffler, D., Laaha, G. (2014). Package 'lfstat', Calculation of Low Flow Statistics for daily stream flow data, 37 p. http://cran.r-project.org/web/packages/lfstat/lfstat.pdf (Pridobljeno 22. 10. 2014.)
- Kovačič, T. (2012). Analiza vpliva lastnosti porečja na indeks baznega odtoka = Analysis of the influence of catchment characteristics on baseflow index. Thesis, Univerza v Ljubljani, FGG, 105 p. (in Slovenian).
- Laaha, G., Blöschl, G. (2006). Seasonality indices for regionalizing low flows, Hydrological Processes, 20(18), 3851–3878.
- Mikoš M., Kranjc A., Rakovec J., Brilly M. (2002). Terminology in hydrology. Acta hydrotechnica, 20(32). http://ksh.fgg.uni-lj.si/ksh/acta/ (Pridobljeno 27. 10. 2014.)
- MOP (Ministrstvo za okolje in prostor). (2014). Pregled pomembnih zadev upravljanja voda na vodnih območjih Donave in Jadranskega morja. Ljubljana, MOP, 132 p. http://www.mko.gov.si/fileadmin/mko.gov.si/pageuploads/podrocja/voda/nuv_II/PZUV.pdf (Pridobljeno 2. 4. 2015.)
- Omuto, C.T., Gumbe, L.O. (2009). Estimating water infiltration and retention characteristics using a computer program in R, Computers & Geosciences 35(3), 579–585.
- Petek, M. (2014). Analiza nizkih pretokov vodotokov v Sloveniji = Low flow analysis of stream flows in Slovenia. Thesis, Univerza v Ljubljani, FGG, 68 p. (in Slovenian).
- R-project (2014). R-project, version 3.0.2. http://www.r-project.org/ (Pridobljeno 20. 2. 2014.)
- Smakhtin, V.U. (2001). Low flow hydrology: a review, Journal of Hydrology 240(3–4), 147–186.
- Srebrnič, T. (2005). Časovna razporeditev padavin in pretokov v Sloveniji z analizo sezonskosti = Time distribution of precipitation and discharges in Slovenia with analysis of seasonality. Thesis, Univerza v Ljubljani, FGG, 137 p. (in Slovenian).
- Šraj, M., Bezak, N., Brilly, M. (2012). The influence of the choice of method on the results of frequency analysis of peaks, volumes and durations of flood waves of the Sava River in Litija, Acta hydrotechnica 25(42), 41–58. (In Slovenian).
- Tallaksen, L.M. (1989). Analysis of time variability in recessions. FRIENDS in Hydrology, IAHS Publication, 187, 85–96.
- Tallaksen, L.M. (1995). A review of baseflow recession analysis, Journal of Hydrology 165, 349–370.
- Thiemig, V., Rojas, R., Zambrano-Bigiarini, M., De Roo, A. (2013). Hydrological evaluation of a satellite-based rainfall estimates over the Volta and Baro-Akobo Basin, Journal of Hydrology 499, 324–338.
- World Meteorological Organization (WMO) (2009). Manual of Low-flow Estimation and Prediction. Operational Hydrology Report No. 50. (WMO-No. 1029). Geneva, 136 p.
- Young, A.R., Round, C.E., Gustard, A. (2000). Spatial and temporal variations in the occurence of low flow events in the UK, Hydrology and Earth System Sciences 4, 35-45.
- Zgonik, T. (2008). Sezonskost mesečnih pretokov v Sloveniji = Seasonality of monthly discharges in Slovenia. Thesis, Univerza v Ljubljani, FGG, 115 p. (in Slovenian).