Seja dam
| Seja dam | |||||
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| Coordinates | 53 ° 46 '12 " N , 127 ° 18' 20" E | ||||
| Data on the structure | |||||
| Construction time: | 1964-1988 | ||||
| Height above foundation level : | 115.5 m | ||||
| Height of the structure crown: | 323.0 m | ||||
| Building volume: | 2.0671 million m³ | ||||
| Crown length: | 714.2 m | ||||
| Power plant output: | 1,330 MW (4 × 225 MW + 2 × 215 MW) | ||||
| Data on the reservoir | |||||
| Altitude (at congestion destination ) | 315 m | ||||
| Water surface | 2,419 km² | ||||
| Reservoir length | 225 km | ||||
| Storage space | 68,420 million m³ | ||||
| Total storage space : | 98.3 m | ||||
| Design flood : | 9,500 m³ / s | ||||
The Seja Dam ( Russian Зейская ГЭС / Seiskaja GES ) dams the Seja River , a tributary of the Amur , to the Seja Reservoir. It is located in the Amur Oblast of the Russian Far East Federal District .
The entire project was planned before 1964 to generate energy from hydropower and for the purpose of flood protection .
Reservoir
The Seja Reservoir is located south of the Stanowoy Mountains , east of the Tukuringra Mountains and northwest of the Jagdy Mountains . Measured by storage space of 68.42 billion cubic meters, it is the eleventh largest on earth. Upon reaching the target of the dam (for the first time in August 1980), its area is 2419 km², the total length of the bank is 2100 km.
dam
The Seja Dam , which was built near the town of Seja , has an unusual construction. It is a pillar dam with cavities that are supposed to ensure a constant temperature in the wall in order to achieve a favorable pressure distribution. In addition, a concrete was used for the first time , which has a greater resistance to cavitation due to its coarse aggregate . Only half of the concrete was used that would have been necessary in a massive, monolithic dam wall. The construction costs could also be reduced to 60 % of the initially estimated value.
The dam, the completion of which is dated in 1978 as well as in 1975 and 1980, has a building volume of more than 2 million m³ at a height of 115.5 m.
The dam or reservoir serve, among other things, for flood protection in the Seja and Amur. In the past, hundreds of hectares of fertile land were often flooded and larger cities such as Seja and Blagoveschensk were threatened. Today the Seja is a regulated river.
The flood discharge has the following discharge capacities, which depend on the water level:
- at an upper water level of 315 m : 2900 m³ / s
- at 317.5 m : 4800 m³ / s
- at 321.1 m : 8400 m³ / s
- at 322.1 m : 9500 m³ / s
Hydroelectric power plant
The Seja power plant is the first large hydropower plant in south-eastern Siberia , where the annual climate creates large temperature differences of up to 80 ° C. It has six machine units with a total installed capacity of 1330 megawatts (originally 215 MW each, together 1290 MW; converted from 1987 to 1990). The turbines have a special feature because their blades are adjustable and are not attached horizontally to the axis, but at an angle of 45 ° . This allows the turbines to be operated effectively even when the water level in the reservoir is low. The hydropower plant has a total volume of 106,700 cubic meters.
The first turbine went into operation on November 27, 1975, the last in June 1980. Today the power plant is operated by RusHydro .
