Streamflow Trends in the Sakarya Basin

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dc.contributor.authorKalayci S.
dc.contributor.authorKahya E.
dc.date.accessioned2020-03-26T16:55:51Z
dc.date.available2020-03-26T16:55:51Z
dc.date.issued2004
dc.departmentSelçuk Üniversitesien_US
dc.description.abstractThe detection and attribution of past trends, changes, and variability in hydroclimatic variables is critical for the understanding of potential future changes resulting from anthropogenic activities. Secular trends in monthly streamflow data are evaluated for the past 31 years for 11 stations in Sakarya basin, Turkey. Several nonparametric tests, which were used successfully in water quality trend analysis, were also applied to detect trends in streamflow over Sakarya basin in this study. These tests were developed because the assumptions of classical parametric methods (i.e., normality, linearity, independence) are usually not met by typical water quality data. Moreover seasonality in data compounds the analysis problem. These data idiosyncrasies are mostly common in streamflow data as well. The non-parametric methods are more flexible and in turn can handle the foregoing difficulties. They are the Spearman's Rho test, the Mann-Kendall test, the seasonal Mann-Kendall test, Sen's T test, and the Van Belle and Hughes test. The magnitudes of linear trends were computed by using Sen's estimator. The homogeneity of trend direction at multiple stations and, in different seasons, was also tested by the Van Belle and Hughes test. The results show that all stations except one generally have downward trends according to the same conclusion from all four tests at the 95% significance level. The Van Belle and Hughes homogeneity tests for seasonal trends indicated that all monthly trends are homogeneous for the remaining ten stations. Based on the same test's procedures, a global trend did not exist for the basin.en_US
dc.identifier.citationKalaycı, S., Kahya, E., (2004). Streamflow Trends in the Sakarya Basin. ARI Bulletin of the Istanbul Technical University, 54(1), 79-84.
dc.identifier.endpage84en_US
dc.identifier.issn1434-5641en_US
dc.identifier.issue1en_US
dc.identifier.scopusqualityN/Aen_US
dc.identifier.startpage79en_US
dc.identifier.urihttps://hdl.handle.net/20.500.12395/19369
dc.identifier.volume54en_US
dc.indekslendigikaynakScopusen_US
dc.indekslendigikaynakTR-Dizinen_US
dc.language.isoenen_US
dc.relation.ispartofARI Bulletin of the Istanbul Technical Universityen_US
dc.relation.publicationcategoryMakale - Uluslararası Hakemli Dergi - Kurum Öğretim Elemanıen_US
dc.rightsinfo:eu-repo/semantics/closedAccessen_US
dc.selcuk20240510_oaigen_US
dc.subjectNon-parametric testsen_US
dc.subjectSakarya basinen_US
dc.subjectStreamflowen_US
dc.subjectTrend analysisen_US
dc.subjectTurkeyen_US
dc.titleStreamflow Trends in the Sakarya Basinen_US
dc.typeArticleen_US

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