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    Öğe
    Clustering of Black Sea Region Stations Using K-Means, Fuzzy C-Means and Silhouette Index Analysis Methods
    (Eskisehir Teknik Üniversitesi, 2023) Kir, Gürkan; Keskin, Asli Ülke; Zeybekoglu, Utku
    In recent years, there has been a noticeable increase in the number of disasters caused by the effects of global climate change. In this context, various studies are carried out in our country and in the world in order to reduce the effects of climate change. The classification of regions affected by climate change into similar classes in terms of climate parameters is important in terms of applying similar methods in studies to be carried out in these regions. Thus, a correct strategy will be determined in the studies to be carried out in order to reduce the effects of climate change. Within the scope of the study, annual temperature records of 31 stations in the Black Sea Region belonging to the Turkish State Meteorological Service for the period 1982-2020 were evaluated. Cluster analysis was carried out using the Fuzzy C-Means and K-Means methods. As a result of the study, the optimum number of clusters was determined by Silhouette index analysis. The most suitable classification for the temperature observations was obtained by the K-Means method by choosing the number of clusters as 5.
  • [ X ]
    Öğe
    Evaluation of The Homogeneity and Trends of Precipitation, Temperature and Wind Speed Parameters in The Black Sea Region
    (Hakan ÇAGLAR, 2023) Keskin, Asli Ülke; Kir, Gürkan; Zeybekoglu, Utku
    In recent years, there has been a noticeable increase in the number of disasters caused by the effects of global climate change. In this context, various studies are carried out in our country and in the world in order to reduce the effects of climate change. In the study, homogeneities and trends of precipitation, temperature and wind speed series of 31 stations in the Black Sea region were investigated. In addition, evaluations were made considering possible tendencies to disrupt homogeneity. In homogeneity analysis, Standard Normal Homogeneity Test (SNHT), Buishand Range Test (BRT), Pettitt Test (PT) and Von Neumann Ratio Test (VN), known as Absolute homogeneity tests, were used. Possible trends of stations were investigated using Spearman's Rho (SR) and Mann Kendall (MK) tests. According to the results of the homogeneity analysis, while the precipitation series of 30 stations were homogeneous, three stations were determined as homogeneous in the wind speed results. When the temperature series of the stations were examined, it was determined that the homogeneity was impaired in all stations. According to the results of the trend analysis, the significant increase trends determined especially in the temperature series show that the region started to warm up over time as an effect of global climate change.