Relationship between Basin Morphometry and Flood-Overflow: Case of Tabakhane Stream (Ünye-Ordu, Türkiye)

Authors : Vedat AVCİ

Pages : 1-22

View : 45 | Download : 11

Publication Date : 2023-02-01

Article Type : Research Paper

Abstract :In the province of Ordu, in August 2018, Tabakhane and Ceviz stream overflowed due to heavy rains, settlements established in the stream bed were damaged and five hundred thousand people in the province were affected by floods and overflows. In this study, it was aimed to evaluate the areal insert ignore into journalissuearticles values(two dimensional); and relief insert ignore into journalissuearticles values(three dimensional); morphometric features of the Tabakhane Stream Basin within the scope of flood-overflow relationship. For this purpose, drainage density insert ignore into journalissuearticles values(Dd);, stream frequency insert ignore into journalissuearticles values(Fs);, basin shape insert ignore into journalissuearticles values(Rf);, elongation ratio insert ignore into journalissuearticles values(Re); and Gravelius index insert ignore into journalissuearticles values(Kg);, basin relief insert ignore into journalissuearticles values(Bh);, relief ratio insert ignore into journalissuearticles values(Rh);, ruggedness value insert ignore into journalissuearticles values(Rn);, time of concentration insert ignore into journalissuearticles values(Tc);, hypsometric curve insert ignore into journalissuearticles values(Hc); and hypsometric integral insert ignore into journalissuearticles values(Hi); analyses were performed. In this study, Digital Elevation Model insert ignore into journalissuearticles values(DEM); is used as the basic data. SYM was created by digitization of 1/25000 scale topography maps of the study area. Geographical Information Systems insert ignore into journalissuearticles values(GIS); software was used to determine the basin boundary, areal and relief morphometric properties were obtained using formulas in the literature. Accordingly, the values of Dd 2,51, Fs 2,97, Rf 0,31, Re 0,63 and Kg were found to be 1,38 in the Tabakhane Stream Basin. According to the results of relief morphometric analysis, the values of Bh were found to be 653 m, Rh as 0,05, Rn as 0.31, Tc as 126, 13 minutes and Hi as 0,30. The high Dd and Fs values in the basin indicate high flood potential. The hypsometric curve of the basin having a longitudinal shape shows a concave appearance. This indicates that floods in the upper basin can cause flooding in the downstream basin. When the climate and morphometric characteristics of the basin are evaluated together, it is seen that the flood-overflow risk is high and therefore the studies to be done to reduce flood losses in the basin should be taken into consideration.
Keywords : Basin morphometry, Flood, Tabakhane Stream, Ünye Ordu,

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