科研之友
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摘要
Flows on stepped spillways have been widely studied in various research institutions. They are motivated by the attractive low costs related to the darn construction using roller compacted concrete and the high energy dissipations that are produced by such structures. The application of stepped spillway has a great using value in small or medium hydraulic project with a low water head and a small amount of discharge. The Chanson method is used to calculate the water surface profile in the stepped spillway of one reservoir, and the result from numerical computation is compared with the on-site physical model test. The water surface elevation and energy dissipation are discussed based on the results. The conclusions in this paper are summarized as: I. The on-site physical model test indicates that the energy dissipation ratio is about 70% to 90% at the exit of the stepped spillway. The energy dissipation efficiency is significant even without construction of stilling basin. 2. The numerical computation shows the water surface of fully developed uniform aerated flow is within the designed limit. The water surface elevations in the spillway at all the stake positions are about I m below the sidewall elevation. Thus the safe running of the spillway can be ensured. 3. The difference between numerical computation and experimental result is about 0.5 m to 0.6 m in the elevation. However, the basic flow characteristics in this study correspond to the real stepped spillway situation generally and thus this difference can be neglected.
- 出版日期2013-9
- 单位水利部交通运输部国家能源局南京水利科学研究院; 云南农业大学
