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Water quality time series for Big Melen stream (Turkey): its decomposition analysis and comparison to upstream

An Erratum to this article was published on 26 May 2010


Big Melen stream is one of the major water resources providing 268 km3 year − 1 of drinking and municipal water for Istanbul. Monthly time series data between 1991 and 2004 for 25 chemical, biological, and physical water properties of Big Melen stream were separated into linear trend, seasonality, and error components using additive decomposition models. Water quality index (WQI) derived from 17 water quality variables were used to compare Aksu upstream and Big Melen downstream water quality. Twenty-six additive decomposition models of water quality time series data including WQI had R 2 values ranging from 88% for log(water temperature) (P ≤ 0.001) to 3% for log(total dissolved solids) (P ≤ 0.026). Linear trend models revealed that total hardness, calcium concentration, and log(nitrite concentration) had the highest rate of increase over time. Tukey’s multiple comparison pointed to significant decreases in 17 water quality variables including WQI of Big Melen downstream relative to those of Aksu upstream (P ≤ 0.001). Monitoring changes in water quality on the basis of watersheds through WQI and decomposition analysis of time series data paves the way for an adaptive management process of water resources that can be tailored in response to effectiveness and dynamics of management practices.

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  • Bouza-Deano, R., Ternero-Rodríguez, M., & Fernandez-Espinosa, A. J. (2008). Trend study and assessment of surface water quality in the Ebro River (Spain). Journal of Hydrology (Amsterdam), 361, 227–239. doi:10.1016/j.jhydrol.2008.07.048

    Article  CAS  Google Scholar 

  • Boyacioglu, H. (2007). Development of a water quality index based on a European classification scheme. Water SA, 33, 101–106.

    CAS  Google Scholar 

  • Chang, N. B., Chen, H. W., & Ning, S. K. (2001). Identification of river water quality using the fuzzy synthetic evaluation approach. Journal of Environmental Management, 63, 293–305.

    Article  CAS  Google Scholar 

  • Erturk, A., Gurel, M., Seker, D. Z., Ekdal, A., Tavsan, C., Ugurluoglu, A., et al. (2007). Design of decision support system tools for integrated protection and water quality management in Melen watershed. International congress on river basin management, Antalya, Turkey, 22–24 March.

  • Giljanovic, N. S. (1999). Water quality evaluation by index in Dalmatia. Water Research, 33, 3423–3440.

    Article  Google Scholar 

  • Hallock, D. (2002). A water quality index for ecology’s stream monitoring program. Technical report no. 02-03-52, Washington Department of Ecology, Environmental Assessment Program, Olympia, WA.

  • Khan, F., Husain, T., & Lumb, A. (2003). Water quality evaluation and trend analysis in selected watersheds of the Atlantic region of Canada. Environmental Monitoring and Assessment, 88, 221–242.

    Article  CAS  Google Scholar 

  • Mantas, E. P., Aydin, E., Insel, G., Ozgun, H., Cakmakci, M., Ozturk, D. C., et al. (2007). Conceptual approach for the determination of point sources in Melen watershed. International congress on river basin management, Antalya, Turkey, 22–24 March.

  • Nasirian, M. (2007). A new water quality index for environmental contamination contributed by mineral processing: A case study of Amang (Tin Tailing) processing activity. Journal of Applied Science, 7, 2977–2987.

    Article  CAS  Google Scholar 

  • Neal, C., Robson, A. J., Jeffery, H. A., Harrow, M. L., Neal, M., Smith, C. J., et al. (1997). Trace element inter-relationships for the Humber rivers: Inferences for hydrological and chemical controls. Science of the Total Environment, 194–195, 321–343.

    Article  Google Scholar 

  • Ocampo-Duque, W., Ferré-Huguet, N., Domingo, J. L., & Schuhmacher, M. (2006). Assessing water quality in rivers with fuzzy inference systems: A case study. Environment International, 32, 733–742.

    Article  CAS  Google Scholar 

  • Odemis, B., & Evrendilek, F. (2007). Monitoring water quality and quantity of national watersheds in Turkey. Environmental Monitoring and Assessment, 133, 215–229.

    Article  CAS  Google Scholar 

  • Odemis, B., & Evrendilek, F. (2008). Multivariate analysis of watershed health and sustainability in Turkey. The International Journal of Sustainable Development and World Ecology, 15, 265–272.

    Article  Google Scholar 

  • Pesce, S. F., & Wunderlin, D. A. (2000). Use of water quality indices to verify the impact of Córdoba City (Argentina) on Suquía River. Water Research, 34, 2915–2926.

    Article  CAS  Google Scholar 

  • Qian, Y., Migliaccio, K. W., Wan, Y., & Li, Y. (2007). Trend analysis of nutrient concentrations and loads in selected canals of the Southern Indian River Lagoon, Florida. Water, Air, and Soil Pollution, 186, 195–208.

    Article  CAS  Google Scholar 

  • Rodríguez-Blanco, M. L., Villanueva-Vigo, J., Taboada-Castro, M. M., & Taboada-Castro, M. T. (2005). Variations in trace elements and suspended solids in a stream under different hydrological conditions: Example of a rural catchment. In C. A. Brebbia, & J. S. Antunes Do Campo (Eds.), River basin management III (pp. 203–212). Southampton: WIT Press.

    Google Scholar 

  • Sanchez, E., Colmenarejo, M. F., Vicente, J., Rubio, A., García, M. G., Travieso, L., et al. (2007). Use of the water quality index and dissolved oxygen deficit as simple indicators of watersheds pollution. Ecological Indicators, 7, 315–328.

    Article  Google Scholar 

  • Simoes, F. S., Moreira, A. B., Bisinoti, M. C., Gimenez, S. M. N., & Yabe, M. J. S. (2008). Water quality index as a simple indicator of aquaculture effects on aquatic bodies. Ecological Indicator, 8, 476–484.

    Article  Google Scholar 

  • Tavsan, C. (2008). Investigating best management practices with the purpose of decreasing non-point nutrient loads in Melen basin. Gradute thesis, Graduate School of Istanbul Technical University (ITU), Istanbul (in Turkish).

  • TSMS (Turkish State Meteorological Service) (2009). Weather forecast of Turkey. Available at

  • Zagatto, P. A., Lorenzetti, M. L., Pérez, L. S. N., Menegon, N., Jr., & Buratini, S. V. (1998). Proposal for a new water quality index. Verhandlungen-Internationale Vereinigung für theoretische und angewandte. Limnologie, 26, 2449–2451.

    CAS  Google Scholar 

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Correspondence to F. Evrendilek.

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Karakaya, N., Evrendilek, F. Water quality time series for Big Melen stream (Turkey): its decomposition analysis and comparison to upstream. Environ Monit Assess 165, 125–136 (2010).

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  • Decomposition analysis
  • Monitoring
  • Time series
  • Water quality index