Safety Analysis of the Baihetan Dam: By Investigating the Pressure Distribution on the Plunge Pool Floor
Independent thesis Advanced level (professional degree), 20 credits / 30 HE creditsStudent thesis
Baihetan Dam is sited on the lower reaches of the Jinsha River in the southwest of China between the boarders of Sichuan and Yunnan province. The dam is scheduled to be taken into operation in the year of 2020 with an installed generation capacity of 14 GW which will put Baihetan Dam on the map as the third largest hydropower station in the world considering installed power output. In comparison, the world’s biggest dam Three Gorges has an installed generation capacity of 22,5 GW.
To ensure a sufficient safety evaluation in terms of erosion (scour) formation at the bottom of the plunge pool, pressure simulations in the plunge pool floor in an experimental model at the Department of Hydraulic Engineering in Tsinghua University, Beijing, China has been performed. Data from two experiments with two different outflow configurations has been obtained and analyzed together with three earlier performed experiments on the same experimental model.
The results from outflow configuration one had an incomplete data set and could not be compared to the other experiments. The results retrieved from the other experiments however showed the importance of a spillway design with nappe splitters and nappe blocks implemented and the value of a sufficient water cushion in the plunge pool. All four outflow configurations with nappe splitters or nappe blocks implemented held a hydrodynamic pressure below the recommended maximum pressure value of 15 cm water head (experimental model scale) stated by the East Asian Investigation and Design Institute, whilst the one configuration with no nappe splitters or nappe blocks exceeded the value. The design of outflow configuration two is four nappe splitters implemented in two spillways and two nappe blocks in two spillways. In this thesis, this configuration has proven to be the most suitable one in terms of maximum pressure minimization and pressure distribution at the plunge pool floor.
Place, publisher, year, edition, pages
2013. , 110 p.
UPTEC STS, ISSN 1650-8319 ; 13042
Hydropower, China, Baihetan Dam, safety evaluation, scour, experimental model.
IdentifiersURN: urn:nbn:se:uu:diva-212476OAI: oai:DiVA.org:uu-212476DiVA: diva2:677971
Vattenfall Vattenkraft, Elforsk
Systems in Technology and Society Programme
2013-09-02, Rum 14113, Lägerhyddsvägen 1, 75106, Uppsala, 20:25 (Swedish)
Chunbo, Jiang, Professor
Andrésdóttir, Elísabet, universitetsadjunkNorrlund, Per