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Article

Bottom-Pressure Development Due to an Abrupt Slope Reduction at Stepped Spillways

1
Laboratory of Hydraulic Constructions (LCH), Ecole Polytechnique Fédérale de Lausanne (EPFL), CH-1015 Lausanne, Switzerland
2
Faculty of Civil Engineering, K.N. Toosi University of Technology, Tehran 1996715433, Iran
3
CERIS, Instituto Superior Técnico, Universidade de Lisboa, 1049-001 Lisbon, Portugal
4
Civil Engineering Department, Haute Ecole d’Ingénierie et d’Architecture de Fribourg (HEIA-FR, HES-SO), CH-1705 Fribourg, Switzerland
*
Author to whom correspondence should be addressed.
Academic Editor: Marco Franchini
Water 2022, 14(1), 41; https://doi.org/10.3390/w14010041
Received: 22 November 2021 / Revised: 17 December 2021 / Accepted: 17 December 2021 / Published: 24 December 2021
(This article belongs to the Special Issue Advances in Spillway Hydraulics: From Theory to Practice)
Fluctuating bottom-pressures on stepped chutes are relevant for the spillway design. An abrupt slope reduction causes a local alteration of the bottom-pressure development. Little information is available regarding the air–water flow properties near an abrupt slope reduction on stepped chutes, particularly on the local pressure evolution. Nevertheless, the option of providing a chute slope reduction may be of interest in spillway layout. The experiments presented herein include pressure distributions on both vertical and horizontal step faces, subsequent to an abrupt slope reduction on stepped chutes. A relatively large-scale physical model including abrupt slope reductions from 50° to 18.6° and from 50° to 30° was used, operated with skimming flow. The data indicate a substantial influence of the tested slope reductions on the bottom-pressure development. In the vicinity of the slope reduction, the mean pressure head near the edge of the horizontal step face reached 0.4 to 0.6 times the velocity head upstream of the slope reduction, for critical flow depths normalized by the step height ranging between 2.6 and 4.6. View Full-Text
Keywords: air–water flow; bottom-pressure; skimming flow; slope reduction; stepped spillway air–water flow; bottom-pressure; skimming flow; slope reduction; stepped spillway
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MDPI and ACS Style

Ostad Mirza Tehrani, M.J.; Matos, J.; Pfister, M.; Schleiss, A.J. Bottom-Pressure Development Due to an Abrupt Slope Reduction at Stepped Spillways. Water 2022, 14, 41. https://doi.org/10.3390/w14010041

AMA Style

Ostad Mirza Tehrani MJ, Matos J, Pfister M, Schleiss AJ. Bottom-Pressure Development Due to an Abrupt Slope Reduction at Stepped Spillways. Water. 2022; 14(1):41. https://doi.org/10.3390/w14010041

Chicago/Turabian Style

Ostad Mirza Tehrani, Mohammad J., Jorge Matos, Michael Pfister, and Anton J. Schleiss. 2022. "Bottom-Pressure Development Due to an Abrupt Slope Reduction at Stepped Spillways" Water 14, no. 1: 41. https://doi.org/10.3390/w14010041

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