Özet:

The aim of this study is to determine overflow susceptibility of the streams causing flood-overflow in Araklı district of Trabzon province and its surroundings with their morphometric features. On the 18th of June in 2019, 9 people lost their lives in the overflow that occurred in the Çamlıktepe neighborhood of Araklı District. The overflow that took place in Karadere Stream Basin destroyed many buildings. In the study, Karadere Stream Basin has been evaluated together with neighboring Yanbolu Stream, Küçükdere Creek, Manahoz Creek and Kastel Creek Basin in terms of morphometric features. Using Digital Elevation Model having 10*10 m cell size covering the basins, the boundaries of the basins have been determined. Indices of drainage density (Dd), stream frequency (Fs), basin shape (Rf), elongation ratio (Re), basin relief (Bh), relief ratio (Rh), ruggedness number (Rn), time of concentration (Tc), hypsometric integral (Hi) and curve (Hc) have been applied to the specified basins by using Geographic Information System software. With the results of the indices, a grading has been done in terms of flood-overflow, and overflow susceptibility of the basins has been determined. Accordingly, overflow susceptibility has been specified as high in Karadere and Kastel Stream Basins, medium in Manahoz Stream Basin, and low in Yanbolu stream and Kucukdere Basin. Due to the relief and climatic-human characteristics of the basins, experiencing overflow on a disaster scale is probable in the basins. It will be beneficial to consider natural (morphometric and geomorphological) and human factors causing flood and overflow when basin management studies are carried out.