9th International Congress on Advances in Civil Engineering, Trabzon, Turkey, 27 - 30 September 2010
The aim of this study is to determine the turbidity and suspended sediment concentration values in the stream Harşit, and evaluate the impact of Torul and Kürtün dams on these parameters. For this reason, a study was fortnightly conducted in four monitoring stations, upstream and downstream of Torul and Kürtün dams, during the four seasons between March 2009 and February 2010.
The yearly average turbidity values were 117 NTU for the upstream of Torul dam with a range of 10-525 NTU, 39 NTU for the downstream of Torul dam with a range of 0-221 NTU, 34 NTU for the downstream of Kürtün dam with a range of 0-406 NTU, and 60 NTU for the downstream of Doğankent HEPP with a range of 0-583 NTU. The greatest turbidity values were observed in spring season due to rainfall in the upstream of Torul dam. The yearly average suspended sediment concentration values were 57.9 mg/L for the first station with a range of 8.2-263.4 mg/L, 12.4 mg/L for the second station with a range of 1.6-54.6 mg/L, 26.2 mg/L for the third station with a range of 0.2-194.6 mg/L, and 29.9 mg/L for the fourth station with a range of 3.2-305.6 mg/L. The greatest suspended sediment concentration values were also observed in spring season in the first.
It was concluded that Torul dam caused to decrease with a 78.6 % in the suspended sediment concentration. When the first and fourth stations were compared, there was decrease with a 48.4 % in terms of suspended sediment concentration. Also, data analysis showed that there was significant correlation between turbidity and suspended sediment concentration values.