Vol.11, No 3, 2013 pp. 199 - 210
UDC
628.161.1(282)(497.11)=111
DOI: 10.2298/FUACE1303199G
TREND ANALYSIS OF WATER QUALITY PARAMETERS FOR THE NISAVA RIVER
Milan Gocic#, Slavisa Trajkovic
Faculty of Civil Engineering and Architecture, University of Niš
E-mail: #milan.gocic@gaf.ni.ac.rs
The data of 12 water quality parameters have been daily monitored at the Nis station on the Nisava River during 2000-2004. The trend analysis was performed on monthly, seasonal and annual time series using the Mann-Kendall test, the Spearman’s Rho test and the linear regression at the 5% significance level. The monthly results showed that significant trends were found only in pH, total hardness, Ca and SO4 data. The results in seasonal series indicated that the significant trends were detected in pH, total hardness, Cl, Ca and SO4 data. In annual series, the trends were insignificant at the 5% significance level.
Key words:
trend analysis, water quality parameters, Mann-Kendall test, Spearman’s Rho test, linear regression, Nisava River
ANALIZA TRENDA PARAMETERA ZA KVALITET VODE NA RECI NIŠAVI
Podaci 12 parametara kvaliteta vode su prikupljani na mernoj stanici Niš tokom perioda 2000-2004. Analiza trenda je urađena za mesečne, sezonske i godišnje vremenske serije korišćenjem Mann-Kendall testa, Spearmanovog Rho testa i linearne regresije za 5% nivoa značajnosti. Mesečni rezultati pokazuju da značajni trendovi postoje samo za sledeće podatake: pH, ukupnu čvrstoću, Ca i SO4. Rezultati sezonskih serija ukazuju das u značajni trendovi detektovani za pH, ukupnu čvrstoću, Cl, Ca i SO4. Za godišnje serije, trendovi nisu značajni za 5% nivoa značajnosti.
Ključne reči:
analiza trenda, parametri kavaliteta vode, Mann-Kendall test, Spearman’s Rho test, linearna regresija, Nišava
