HYDRAULIC STUDY FOR SUBSTANTIATING THE CONDITIONS FOR PASSING FLOWS THROUGH DEEP DIVERSION SPILLWAYS OF THE BUREYA WATERWORKS FACILITY

摘要

Beginning with the low-water autumn-winter season of 2002/2003, flows at the Bureya waterworks facility during the erection of the dam, filling of the storage, and startup of the generating sets are passed only through deep diversion spillways (DDS). The project, developed by the Lengidro-proekt Company, stipulates that these spillways are to serve for four years until the startup of the last generating set (three generating sets are equipped with disposable wheels for this period). Such temporary spillways have been used in the erection of concrete dams of the Krasnoyarsk and Zeisk waterworks facilities, but the DDS of the Bureya facility are designed for operation at a higher head and have a large cross section. The Bureya DDS also differ from the two mentioned DDS in their layout, structure, and conditions of mating the tailrace. Depending on the height of the erected dam eight spans of the DDS together with the hydraulic units are to pass maximum diversion flows in the first two years, at a rate of 8600 and 10,130 m~3/sec, which corresponds to inflow provision of 1 %. In the subsequent two years eight and five (respectively) DDS spans together with hydraulic units should provide diversion of maximum design flows repeated once every 1000 years; with allowance for accumulation in the storage the flow rates will be 11,300 and 8080 m~3/sec, respectively. The maximum design head in the mentioned spillways should reach 61, 71, 93 and 101.5 m with growth in the levels of storage.