Abstract
This study attempts to find out the best-fit probability distribution function to low flows using the up-to-date data of intermittent and non-intermittent rivers in four hydrological basins from different regions in Turkey. Frequency analysis of D ¼ 1-, 7-, 14-, 30-, 90- and 273-day low flows calculated from the daily flow time series of each stream gauge was performed. Weibull (W2), Gamma (G2), Generalized Extreme Value (GEV) and Log-Normal (LN2) are selected among the 2-parameter probability distribution functions together with the Weibull (W3), Gamma (G3) and Log-Normal (LN3) from the 3-parameter probability distribution function family. Selected probability distribution functions are checked for their suitability to fit each D-day low flow sequence. LN3 mostly conforms to low flows by being the best-fit among the selected probability distribution functions in three out of four hydrological basins while W3 fits low flows in one basin. With the use of the best-fit probability distribution function, the low flow-duration-frequency curves are determined, which have the ability to provide the end-users with any D-day low flow discharge of any given return period.
Original language | English |
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Pages (from-to) | 30-39 |
Number of pages | 10 |
Journal | Water Science and Technology: Water Supply |
Volume | 19 |
Issue number | 1 |
DOIs | |
Publication status | Published - Feb 2019 |
Bibliographical note
Publisher Copyright:© 2019 IWA Publishing. All rights reserved.
Keywords
- Frequency analysis
- Intermittent river
- Low flow
- Low flow-duration-frequency curve