Hydraulics of Skimming Flow on Modeled Stepped Spillways
2000; American Society of Civil Engineers; Volume: 126; Issue: 12 Linguagem: Inglês
10.1061/(asce)0733-9429(2000)126
ISSN1943-7900
AutoresRobert M. Boes, Jorge Matos, Iwao Ohtsu, Y. Yasuda, Masayuki Takahashi, Sandip P. Tatewar, Ramesh N. Ingle, P. D. Porey, Geoffrey Pegram, Andrew K. Officer, Samuel R. Mottram,
Tópico(s)Urban Stormwater Management Solutions
ResumoTwo sets of models of stepped spillways of slope 1 upon 0.6 with the same crest-shape and with a range of step sizes (0.25–2.0 m on the 1:10 scale and 0.5–2.0 m on the 1:20 scale models) were built and studied. In the range of prototype unit flows considered (0.8–3.8 m2/s on the 1:10 scale models and 1.8–21.7 m2/s on the 1:20 models), the residual specific energy is independent of these step sizes, at positions where measurements were made on the spillways (from 30 m below the crest) once fully aerated skimming flow is established. The residual specific energy at the toe of a 50-m-high (or higher) stepped spillway, within the range of step heights tested, is <60% of the residual specific energy at the same level on a similar smooth spillway experiencing flows up to 20 m2/s; at these flows and at this height, the stepped spillway was found to be in equilibrium. The reduction of specific energy is lower than that expected from previous studies; these findings are likely to impact on the design of stepped sp...
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