Akademik Veri Yönetim Sistemi
ARABIAN JOURNAL OF GEOSCIENCES, cilt.13, 2020 (SCI-Expanded)
This paper describes an instability in the Yokuslubag village of the Yusufeli district of Artvin in Northeastern Turkey. The Arkun Dam was one of the dams planned on the basin of the coruh River. The Yokuslubag landslide area starting at 600 m upstream is on the left side of the Arkun Dam. The sliding area is approximately 2 km(2). The landslide consists of rockfalls, rotation slides, planar slides, slope wash deposit and alluvial fans. The causes of the slidings are the toe erosion by the coruh River, high slope angles varying between 20 degrees and 35 degrees, rockfalls in the Berta Formation and hydrothermal and physical weathering. Lithology boundaries and possible sliding surfaces were determined with drilling and resistivity studies. One hundred iron bars were fixed on the landslide, and the movements of these iron bars were recorded. The Yokuslubag landslide was determined as a huge creep. Two possible sliding surfaces were determined. When the water was accumulated in the reservoir, the toe of landslide would be under reservoir lake. This would increase landslide velocity and may cause dam failure. According to the first possible sliding surface, the sliding material amount was calculated as approximately 100 x 10(6) m(3). This material would fill approximately 1/3 of the reservoir of the Dam. If the second possible sliding surface mobilized, approximately 130 x 10(6) m(3) of material would move into the reservoir. According to these possibilities, the Arkun Dam project was canceled, and other alternatives were considered.