Gamma autoregressive models and application on Kizilirmak Basin

Sarlak N., Sorman A. U.

TEKNIK DERGI, vol.18, no.3, pp.4219-4227, 2007 (SCI-Expanded) identifier identifier

  • Publication Type: Article / Article
  • Volume: 18 Issue: 3
  • Publication Date: 2007
  • Journal Name: TEKNIK DERGI
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus, TR DİZİN (ULAKBİM)
  • Page Numbers: pp.4219-4227
  • Middle East Technical University Affiliated: Yes


Stochastic models are required to generate synthetic values of flows statistically similar to observed ones to use in the simulation studies of water related structures. Such models are extremely important for generation of flows of streams with short record length. Autoregressive time series (AR) models are the most used models in this area. In recent years, AR models valid for gamma distribution are developed. In these studies, method of moments and modified maximum likelihood methods are used to estimate the model parameters. The aim of this study are comparing two AR models under gamma distribution assumption and applying these models for monthly data set of EIE 1501 and EIE 1517 streamflow gauging stations located in Kizilirmak Basin. The results of each model are interpreted for researchers using these models in their further studies.