Author(s): I. Meireles; J. Matos; J. Falcao De Melo
Linked Author(s): Jorge Matos
Keywords: Stepped spillway; Skimming flow; Pressure head; Residual energy; Hydraulic jump
Abstract: Experimental research was conducted in skimming flows on a large-scale stepped chute assembled at the National Laboratory of Civil Engineering (LNEC), Lisbon. In the present paper, new data is presented on the development of the pressure head along the floor of the stilling basin next to the chute. The validity of the hypothesis of hydrostatic pressure distribution on the upstream end of the hydraulic jump formed on the stilling basin is analyzed. New dimensionless formulae are presented for predicting the pressure head along the stilling basin floor, in particular in the vicinity of the impact flow region. Dimensionless formulae are also presented for correcting the equivalent clear water depth as well as the specific energy at the upstream end of the hydraulic jump, when they are calculated assuming the hydrostatic pressure distribution on that section.
Year: 2005