1
M.sc. Student, Department of Water Engineering, University of Tabriz, Tabriz, Iran
2
Associate Professor, Department of Water Engineering, University of Tabriz, Tabriz, Iran
3
Professor, Department of Water Engineering, University of Tabriz, Tabriz, Iran
Abstract
The aim of this study is trend analysis of streamflows of east Azarbayejan in three time scales, which are monthly, seasonal and annual using the non-parametric methods. For this purpose the information of discharges of ten hydrometric stations (1983 -2008) were used. The Mann-Kendal test was used after removing the all significant autocorrelation effects from the data. In order to estimate the slope of trend line the Sen,s estimator method was used.Results showed that about 30% of the stations showed statistically significant negative trends in annual time scale. The strongest negative trend line slope belonged to the Vanyar station having the slope of 0.35 (m3/s/year) in annual time scale. In seasonal time scale, negative trends observed at almost all the stations. In monthly time scale streamflow trends were negative for most of the stations and none of the stations experienced positive significant trends (even at 10% level). The strongest negative trend observed in Tazekand (Soofi-Chay), which was significant at 10% level.
Ghezel saflo, M., Dinpashoh, Y., Ghorbani, M. & Fakheri-Fard, A. (2012). Trend Analysis of Streamflows in East Azarbayjan Province. Irrigation Sciences and Engineering, 35(1), 71–82.
MLA
Ghezel saflo, M., Dinpashoh, Y., Ghorbani, M., & Fakheri-Fard, A. "Trend Analysis of Streamflows in East Azarbayjan Province", Irrigation Sciences and Engineering, 35, 1, 2012, 71–82.
HARVARD
Ghezel saflo, M., Dinpashoh, Y., Ghorbani, M., & Fakheri-Fard, A. (2012). 'Trend Analysis of Streamflows in East Azarbayjan Province', Irrigation Sciences and Engineering, 35(1), pp. 71–82.
CHICAGO
Ghezel saflo, M., Dinpashoh, Y., Ghorbani, M. & Fakheri-Fard, A., "Trend Analysis of Streamflows in East Azarbayjan Province." Irrigation Sciences and Engineering, 35 1 (2012): 71–82,
VANCOUVER
Ghezel saflo M., Dinpashoh Y., Ghorbani M., Fakheri-Fard A. Trend Analysis of Streamflows in East Azarbayjan Province. JISE. 2012;35(1):71–82 (In Persian).
