K. Warren Frizell. 2011. "Cavitation on Stepped Spillways - Lab Studies of Damage Potential". Bureau of Reclamation, Report Number PAP-1032.
Abstract: Beginning in the summer of 2009, Reclamation initiated a test program to investigate the cavitation potential of the new auxiliary spillway being designed by the Corp of Engineers for Folsom Dam in Sacramento, CA. This spillway is a novel design that features a high velocity flow exposed to a series of steps at a slope of 1V:2.48H, terminating in a modified type III stilling basin. Testing of a sectional model of the step geometry revealed a high- intensity shear layer above the step tips where turbulent energy production is high. Reduced atmospheric testing within the low ambient pressure chamber (LAPC) allowed for visualization of cavitation structures that would be probable in non-aerated prototype spillway flows. Due to scale effects in simulating the cavitation in this manner, damage to the model resulting from the visualized implosions of cavitation bubbles and vortices typically does not occur. The test program showed good potential to provide generalized data for stepped spillways and Reclamation’s Dam Safety Office and Science and Technology Programs provided additional funds to extend the data to additional slopes. This memorandum will detail lab studies to document cavitation damage to the stepped spillway surfaces based on the cavitation that had been visualized in the LAPC testing. Science and Technology funding was used to complete this task in FY2010.
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