FREQUENCY ANALYSIS OF MEAN MONTHLY STREAM FLOW IN CORUH BASIN TURKEY

YERDELEN C., KAHYA E.

Fresenius Environmental Bulletin, cilt.19, sa.7, ss.1300-1311, 2010 (SCI-Expanded) identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 19 Sayı: 7
  • Basım Tarihi: 2010
  • Dergi Adı: Fresenius Environmental Bulletin
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED)
  • Sayfa Sayıları: ss.1300-1311
  • İstanbul Teknik Üniversitesi Adresli: Hayır

Özet

This paper analyzes mean monthly stream-flow data recorded from 29 stream-flow gauging sites in Coruh 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-moment-based heterogeneity measure. We divided Coruh basin into 5 subregions and single sites. A number of L-moments-based 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 Coruh 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.