Author(s): Raul Antonio Lopardo
Linked Author(s): Raúl Antonio Lopardo
Keywords: No Keywords
Abstract: The probability of an original contribution for the design of spillways within the “steady state hydraulics”, based on mean values, is today obviously scarce. On the other hand, the stilling basins are structures submitted to macroturbulent flows, being the phenomena of the jump the responsible for the greater part of the processes linked to energy dissipation. The techniques and random variables record and its computer processing were not spread sufficiently in the hydraulic laboratories in the sixties, and the large dams had not suffered yet the deterioration that only it is possible then from the important floods. The long delay in the construction of large dams in Argentina provided sufficient time for the development of basic and applied research about this. The almost whole national and bi-national projects were carried out in this institute, producing original results. It is of underlining that the mentioned hydroelectric dams include stilling basin with exceptional characteristics, as large specific discharge, oscillatory hydraulic jumps, strong relationships of river contraction, restitution levels not always adapted to the discharge and usually abnormal operation conditions. This paper deals on the laboratory contribution for the design and verification of stilling basins en the large dams located in flatland valleys, as the Parana River and the Uruguay River. The intermittent cavitation due to pressure fluctuations induced by hydraulic jumps, the effect of aeration in flows with low Froude Numbers and the pressure fluctuations effects in local scour, downstream the end sill are presented with exemples.
Year: 2001