Abstract
Abstract. Dams located near urban areas have a high risk potential for life and property in downstream. Turkey is one of the most seismically active regions in the world and has at least 1200 large dams with different type. Major earthquakes with the potential of threatening life and property occur frequently here. Kizilirmak basin studied in this article is located in a seismically very active part of Turkey. The northern part of basin is structurally cut by a significant fault system. The shear zone, which is frequently jointed, fractured and faulted at the central part of basin increases total risk of dams within the zone. Consequently, there are so many large dams, which are located close to these faults in the basin. In this paper authors summarize the methods used for the analysis of total risk, discuss the seismic hazards of 36 large dams constructed in the Kizilirmak basin on the basis of the seismic activity of the dam site and their total risk as based on physical properties and the position in the basin. The seismic hazard analyses have indicated that peak ground acceleration changes within a wide range (0.09 g and 0.45 g) for the dam sites of basin. The total risk analyses depending on the seismic hazard rating of dam site and risk rating of the structure have concluded that 23 large dams have high-risk class in the basin.
Highlights
The total risk for dam structures primarily depends on the seismic hazard rating of dam site and the risk rating of the dam and appurtenant structures
The dams, which are classified as risk class II with moderate risk rating, are mainly concentrated on the central part of basin and have entirely been constructed on the secondary branches of Kizilirmak river
This study identified at least twenty-three large dams of the Kizilirmak basin, which must be reanalyzed by selecting appropriate seismic parameters
Summary
The total risk for dam structures primarily depends on the seismic hazard rating of dam site and the risk rating of the dam and appurtenant structures. This paper deals with an evaluation of seismic hazard and total risk, and evaluates 36 large embankment dams, which have a structural height ranging from 15 to 195 m in the Kizilirmak basin locating at the central part of Turkey. So many dam sites were taken into account as control points for the area including main structural features These maps show that the most critical area in the basin is very close to the North Anatolian Fault zone, because the greater acceleration values are seen on this part. This fault is critical for eight large dams considered for this study. The PGA values for these dams range from 0.42 g to 0.45 g
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