Comparison of Mann–Kendall and innovative trend method for water quality parameters of the Kizilirmak River, Turkey

Comparison of Mann–Kendall and innovative trend method for water quality parameters of the Kizilirmak River, Turkey

•Trends of various water parameters in the Kizilirmak River, Turkey are investigated by using two different trend methods.•Recently proposed a method by Şen (2012) is compared with the well-known Mann–Kendall trend method.•Şen’s method shows low, medium and high values of data on the Cartesian coord...

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Bibliographic Details
Published in:Journal of hydrology (Amsterdam) 2014-05, Vol.513, p.362-375
Main Authors: Kisi, Ozgur, Ay, Murat
Format: Article
Language:eng
Subjects:
Climatology
Design parameters
Earth sciences
Earth, ocean, space
Exact sciences and technology
Freshwater
Geochemistry
Hydrology
Hydrology. Hydrogeology
Kizilirmak River
Mann–Kendall trend test
Mineralogy
Rivers
Silicates
Stations
Trend analysis
Trends
Water geochemistry
Water parameters
Water quality
Water resources
Şen trend test
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Summary:•Trends of various water parameters in the Kizilirmak River, Turkey are investigated by using two different trend methods.•Recently proposed a method by Şen (2012) is compared with the well-known Mann–Kendall trend method.•Şen’s method shows low, medium and high values of data on the Cartesian coordinate system.•Şen’s method is not based on a set of assumptions.•Data can be also analyzed by Şen method with less data, and can have any a skewed distribution. Low, medium and high values of a parameter are very important issues in climatological, meteorological and hydrological events. Moreover these values are used to decide various design parameters based on scientific aspects and real applications everywhere in the world. With this concept, a new trend method recently proposed by Şen was used for water parameters, pH, T, EC, Na+, K+, CO3-2, HCO3-, Cl−, SO4-2, B+3 and Q recorded at five different stations (station numbers and locations: 1535-Sogutluhan (Sivas), 1501-Yamula (Kayseri), 1546-Tuzkoy (Kayseri), 1503-Yahsihan (Kirsehir), and 1533-Inozu (Samsun)) selected from the Kizilirmak River in Turkey. Low, medium and high values of the parameters were graphically evaluated with this method. For comparison purposes, the Mann–Kendall trend test was also applied to the same data. Differences of the two trend tests were also emphasised. It was found that the Şen trend test compared with the MK trend test had several advantages. The results also revealed that the Şen trend test could be successfully used for trend analysis of water parameters especially in terms of evaluation of low, medium and high values of data.
ISSN:0022-1694
1879-2707