Author(s): Masayuki Takahashi, Yuki Yamamoto, Iwao Ohtsu
Linked Author(s): Masayuki Takahashi
Keywords: Stepped spillway, nonaerated skimming flow, surface profile, boundary layer development, energy dissipation
Abstract:
For a large discharge and/or small dam height, the nonaerated flow region occupies a large portion of the skimming flow in stepped spillways. For the hydraulic design of stepped channels, it is important to know the depth and the velocity in nonaerated skimming flows to estimate the specific energy. However, most experimental studies for stepped channels have focused on aerated skimming flows, and characteristics of nonaerated skimming flows have not yet been clarified. This study presents reasonable equations for estimating the boundary layer development and the water surface profile along the spillways for nonaerated skimming flows. The energy head along the channel is obtained, indicating that the energy dissipation for the stepped spillway becomes larger than that for the smooth spillway. (2598, 68, 345)
Year: 2017