Investigation of seasonal changes in some water quality parameters and trend analysis: An application to the watershed of Catalan dam

In this study, it was aimed to examine the seasonal changes of some water quality parameters and to make trend analyzes. Seasonal and annual data of 16 different water quality parameters, varying between 8-27 years, were studied at 9 water quality stations located in the Catalan Dam Basin, in the Seyhan River catchment, located in the provincial borders of Adana and Kayseri. Non-parametric Mann-Kendall u(t) Test was used to determine the starting year of the trend. Kruskall-Wallis H Test and Mann-Whitney U Tests were applied to determine seasonal differences. Based on seasonal averages, it was determined that the temperature parameter showed the highest difference at 5% significance level. It has been suggested that especially the water quality parameters showing the trending behavior should be observed at least once in a year a seasonal basis.