A NEW METHODOLOGY FOR TREND ANALYSIS: A CASE STUDY IN BURDUR AND ISPARTA, TURKEY

Nowadays where global climate change effects have been remarkably perceived, the determination of trends of rainfall, stream flow, and temperatures has become crucial for the planning of water sources and engineering phases of future projects. A bunch of methods are suggested by many researchers to determine these trends and some estimations are tried to be made. A new method based on a graphical method developed by Sen is proposed in this study. This new method was compared with current methods of Mann-Kendall test statistic, regression model and Sen's graphical method. For comparison, the rainfall data of Burdur and Isparta have been chosen, and the trend analyses were performed monthly and annually. As one of the conclusions of this study, it iwas observed that Sen's graphical test and this new method have similar results and it was seen that the results of the regression test support both of these two tests. On the other hand, Mann-Kendall test results were found as partly similar to the results of this study. In conclusion, it is considered that this new test method can be used for trend analysis.