Trend Analysis of Stream Flow Changing of chamenjirwatersheedUsing Nun-parametric Tests

Document Type : Research Article


1 Assistant Professor of Water Engineering ,University of Lorestan, Khorramabad, Iran

2 Ph.D. Student of Water Structure, Faculty of Agric., University of Lorestan, Khorramabad, Iran


Trend analysis of changing stream flow of spring in khoramabad city in three times span namely month, season and annual were investigated by statistical method. The data used include data from 4Spring were selected in 40-years period (1348-1388). In this study, the slope of the linear trend in the data sample estimates with using the TSA and then with using TFPWmethodthe effect of coefficient of autocorrelation of data was eliminated, and discharge time series prewhitened, then trend changing of original and prewhitened time series with MK test were analyzed. Ultimately rend analysis of changing of station of precipitation in annual were investigated by statistical method. The results of investigation in annual based on MK_ TFPW presented. Also the results of this research show that at annual scale of stations no trend is significant at 10% decreasing of spring flow is due increase of pickup underground water.


Main Subjects

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Volume 3, Issue 3
September 2017
Pages 415-425
  • Receive Date: 10 October 2016
  • Revise Date: 15 November 2016
  • Accept Date: 29 October 2016
  • First Publish Date: 29 October 2016