Experimental investigations on high-velocity jet characteristics and its influence on plunge pool rock scour
Publish Year: 1383
نوع سند: مقاله کنفرانسی
زبان: English
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شناسه ملی سند علمی:
HDRS_20
تاریخ نمایه سازی: 16 آذر 1384
Abstract:
In high dams, water spill operations for flood management by means of highvelocity jets often imply the dissipation of the flowenergy directly on the rocky riverbed. This paper presents updated information on ongoing research on plunge pool scour. Experimental investigations have been conducted to estimate jet turbulence intensity at issuance for prototype velocities up to 30 m/s. This parameter is of key importance for the definition of the jet characteristics at impact downstream and for dynamic pressures in the pool bottom. Turbulence intensities of 3 to 14% were observed for velocities between 10 and 29.5 m/s. Furthermore, experimental work is underway to assess the influence of pool geometry (lateral confinement) on jet development and on pressures at the water-rock interface. Besides a better understanding of plunge pool scour formation, the research results aim at improving measures for rock scour management, such as pre-excavation and tailpond dams.
Authors
P.A. Manso
Laboratory of Hydraulic Constructions, Swiss Federal Institute of Technology Lausanne (EPFL), Switzerland
E.F.R. Bollaert
Laboratory of Hydraulic Constructions, Swiss Federal Institute of Technology Lausanne (EPFL), Switzerland
A.J. Schleiss
Laboratory of Hydraulic Constructions, Swiss Federal Institute of Technology Lausanne (EPFL), Switzerland
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