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Title

TREND ANALYSIS OF STREAMFLOWS IN EAST AZARBAYJAN PROVINCE

Pages

 Start Page 71 | End Page 81

Abstract

 The aim of this study is TREND analysis of STREAM FLOWs 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 often 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 timescale. In seasonal time scale, negative TRENDs observed at almost all the stations. In monthly time scale STREAM FLOW TRENDs were negative for most of the stations and none of the stations experienced positive significant TRENDs (evenat 10% level). The strongest negative TREND observed in Tazek and (Soofi-Chay), which was significant at 10% level.

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