State of the Dam of the Sayano-Shushenskaya Hydropower Plant in the Last Stage of Reconditioning of the Pressure-Face Concrete and Contact Zone of the Rock Bed

Stafievskii, V. A.; Bulatov, V. A.; Reshetnikova, E. N.; Stefanenko, N. I.; Permyakova, L. S.; Epifanov, A. P.

doi:10.1023/b:hyco.0000021295.53182.aa

Cited by 2 publications

(1 citation statement)

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“…Active storage values were found for the Irkutskoe/Baikal system (46 km 3 [ Vyruchalkina , 2004]), the Bratskoe reservoir (48.2 km 3 [ Nazarov , 1985]), and the Ust'‐Ilimskoe reservoir (2.8 km 3 [ Vyruchalkina , 2004]). For the Sayano‐Shushenskoe reservoir, active storage was calculated using and f ′, given that the top of dead storage is 42 m below the top of the dam [ Stafievskii et al , 2003]). This resulted in a value of 13.5 km 3 .…”

Section: Methodsmentioning

confidence: 99%

Simulation of reservoir influences on annual and seasonal streamflow changes for the Lena, Yenisei, and Ob' rivers

Adam¹,

Haddeland²,

Su³

et al. 2007

J. Geophys. Res.

132

123

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Since the 1930s, combined streamflow from the largest Eurasian rivers discharging to the Arctic Ocean has been increasing. For many of these rivers, an increase in annual streamflow volume has been accompanied by a shift in seasonality (e.g., earlier snowmelt runoff in the spring). These changes in annual and seasonal streamflow may be due to direct effects of climate change (e.g., increased precipitation, or changes in snow accumulation and ablation patterns), indirect effects of climate change (e.g., changes in permafrost), or human effects (e.g., storage and release of river runoff in reservoirs). We develop and describe a method to estimate the potential contributions of artificial reservoirs to long‐term changes in annual and seasonal streamflow between 1937 and 1998. Reservoir effects on downstream flow are simulated using a reservoir routing model coupled off‐line to the Variable Infiltration Capacity (VIC) land surface hydrology model for the Lena, Yenisei and Ob' river basins. The effects of reservoirs on basin average evaporation are also represented. We perform trend analysis on long‐term (≥30 years) time series of seasonal and annual streamflow and isolate the effects of reservoirs. Although reservoirs have had little effect on trends in annual discharge from the Lena, Yenisei, and Ob' river basins, we conclude that they are responsible for many of the seasonal changes that have been observed. For the Lena, reservoirs account for up to 80% and 30% of the observed winter and spring trends, respectively. For the Yenisei, reservoirs account for up to 100%, 40%, and 60% to 100% of the observed winter, spring, and late summer to early fall trends, respectively. For the Ob', reservoirs may account for more than 70% of the observed trends during the months of January to March. A result of this study is a set of reconstructed streamflow at the outlets of the Lena, Yenisei, and Ob' river basins which can be used in subsequent studies to improve the understanding of climate change effects on runoff generation in the Eurasian Arctic.

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Section: Methodsmentioning

confidence: 99%

Simulation of reservoir influences on annual and seasonal streamflow changes for the Lena, Yenisei, and Ob' rivers

Adam¹,

Haddeland²,

Su³

et al. 2007

J. Geophys. Res.

132

123

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Condition of the thrust front of the Sayano-Shushenskaya HPP after completion of repairs to reduce its perviousness

Permyakova¹,

Epifanov²,

Stefanenko³

2008

Power Technol Eng

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It is required to regulate filling of the reservoir with consideration of the temperature field of the structure.The Sayano-Shushenskaya gravity-arch dam has been in service in the design mode since 1990. During the 16-year period of normal service, it has been repeatedly subjected to large-scale technogenic effects. The most significant of these has been repair work performed to eliminate seepage within a zone of cracking of the first column of the dam between elevations 344 and 359 m. This work was conducted in 1996 in the concrete of the thrust face in sections 19, and 21 -46 at high upper-pool levels (UPL) using "Rodur" twocomponent epoxy resins [1,2]. Injection of the loosened rock bed of the channel dam with a material of similar composition was carried out during the period from 1998 through 2003 [3]. Work on restoration of the anti-seepage properties of the upper portion of the deep grout curtain was conducted in several stages: under sections 40 -42 in 1998, sections 26 -29 in 1999, sections 30 -39 in 2000, sections 15 -25 in 2001, and under sections 43 -48 in 2002 and 2003. In each of the stages, the repair work was done in two phases: first phase -at minimum upper-pool levels; and, second phase -with the UPL close to maximum. Individual subhorizontal cracks with the greatest seepage, which were situated within the concrete of the first column between elevations 374 and 386 m (upper zone of cracking) were subjected to "medical treatment" in 2004. In 2006, work involving repair of a permeable section of the right-bank grout curtain, which was located between elevations 344 and 413 m, was begun during the stage of the reservoir's filling.Timely repair operations within the concrete of the thrust face and bed of the channel dam using non-traditional procedures and materials made it possible to achieve the following expected results:-heavy seepage through the cracked section of the thrust front between elevations 344 and 359 and 359 and 386 m has been suppressed; residual seepage flows have amounted to 5 liters/sec (1996) and 8.5 liters/sec (2004), whereas their maximum values in the periods prior to the repair had been 458 and 55 liters/sec, respectively; -the concrete in the lower section of the thrust face has been pressed in the cantilever direction, and residual additional compression has amounted to from 1 to 2 MPa; and, -seepage flow within the bed of the channel dam has been reduced from 549 (1996) to 50 liters/sec.In individual years of the repair and post-repair periods, the conditions under which the reservoir has been filled have been characterized by a large influx in different stages of the rise in the UPL, and prolonged maintenance of high levels at elevations close to the normal backwater level (NBL). In 2001 and 2004, the maximum rate of filling of the reservoir reached 1.9 m/day. After a rapid increase in hydrostatic load occurs during sudden filling of a reservoir, the temperature of the concrete in the downstream face does not have time to rise significantly. And, radial displacements...

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State of the Dam of the Sayano-Shushenskaya Hydropower Plant in the Last Stage of Reconditioning of the Pressure-Face Concrete and Contact Zone of the Rock Bed

Cited by 2 publications

References 1 publication

Simulation of reservoir influences on annual and seasonal streamflow changes for the Lena, Yenisei, and Ob' rivers

Simulation of reservoir influences on annual and seasonal streamflow changes for the Lena, Yenisei, and Ob' rivers

Condition of the thrust front of the Sayano-Shushenskaya HPP after completion of repairs to reduce its perviousness

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