- Gümüşhane Üniversitesi Sosyal Bilimler Dergisi
- Vol: 14 Issue: 1
- Relationship between Basin Morphometry and Flood-Overflow: Case of Tabakhane Stream (Ünye-Ordu, Türk...
Relationship between Basin Morphometry and Flood-Overflow: Case of Tabakhane Stream (Ünye-Ordu, Türkiye)
Authors : Vedat Avci
Pages : 1-22
View : 15 | Download : 5
Publication Date : 2023-02-01
Article Type : Research
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 (two dimensional) and relief (three dimensional) morphometric features of the Tabakhane Stream Basin within the scope of flood-overflow relationship. For this purpose, drainage density (Dd), stream frequency (Fs), basin shape (Rf), elongation ratio (Re) and Gravelius index (Kg), basin relief (Bh), relief ratio (Rh), ruggedness value (Rn), time of concentration (Tc), hypsometric curve (Hc) and hypsometric integral (Hi) analyses were performed. In this study, Digital Elevation Model (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 (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).