Frequency analysis of mean monthly streamflow in Çoruh basin, Turkey

Cahit Yerdelen*, Yashar Karimi, Ercan Kahya

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

16 Citations (Scopus)


This paper analyzes mean monthly stream-flow data recorded from 29 stream-flow gauging sites in Çoruh basin, Turkey. In regional mean monthly stream-flow analysis based on L-moments, at first, discordancy measures have been used to screen data on each of the 29 gauging sites. Homogeneity of the basin has been tested using L-momentbased heterogeneity measure. We divided Çoruh basin into 5 subregions and single sites. A number of L-momentsbased frequency distributions (i.e., generalized logistic (GLO), generalized extreme value (GEV), generalized Pareto (GPA), generalized normal (GNO), Pearson type III (PE3), and 5-parameter Wakeby (WAK) distribution) have been used in order to find a suitable distribution for quantile estimates. We determined that the GNO, GPA, and WAK distributions appeared to be a robust distribution in Çoruh basin. Finally, we carried out the Monte Carlo simulations for the quantile estimation accuracy. As a result, the GPA, GNO and WAK distributions generated similar quantiles.

Original languageEnglish
Pages (from-to)1300-1311
Number of pages12
JournalFresenius Environmental Bulletin
Issue number7
Publication statusPublished - 2010


  • Ç
  • Discordancy measure
  • L-moment
  • Oruh basin
  • Quantile estimation
  • Regional frequency analysis


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