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You are here : eLibrary : IAHR World Congress Proceedings : 36th Congress - The Hague (2015) ALL CONTENT : Water engineering : Air entrainment and pressure development in skimming flow on an abrupt slope change on stepped spill...
Air entrainment and pressure development in skimming flow on an abrupt slope change on stepped spillways
Author : M.J. OSTAD MIRZA(1,2), J. MATOS(2) , M. PFISTER(1) & A.J. SCHLEISS(1)
ABSTRACT
Numerous stepped spillways were built to date, namely on RCC gravity dams or on valley flanks besides embankment
or rockfill dams, while some others are currently under design or construction. In some cases, slope changes may be
required on stepped chutes, due to the topography, leading to reduced excavation and related economic benefits. A quite
limited number of stepped spillways have been built with slope changes, whereas no systematic scientific investigation
for designing such type of configuration has been conducted to date. Thus, there is a lack of information with regards to
the main flow features along abrupt slope changes on stepped spillways. The present study is focussed on an
experimental investigation of the air entrainment and pressure development on skimming flow on stepped spillways, in
the vicinity of an abrupt slope change. Physical modelling was conducted in a relatively large scale facility, where
detailed air-water flow measurements were gathered upstream and downstream of a 50˚-30˚slope change. In addition,
dynamic pressure measurements were obtained on both vertical and horizontal faces of several steps in the vicinity of
the slope change. The results on the air entrainment and pressure development are presented and discussed. A
substantial influence was observed on the air entrainment and pressure development pattern, in comparison with typical
results for constant sloping stepped spillway flows.
File Size : 1,047,271 bytes
File Type : Adobe Acrobat Document
Chapter : IAHR World Congress Proceedings
Category : 36th Congress - The Hague (2015) ALL CONTENT
Article : Water engineering
Date Published : 12/08/2015
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