Author(s): Javad Farhoudi; Ebrahim Valizadegan
Linked Author(s):
Keywords: Stilling basin; Scoring; Riprap protection
Abstract: Scour downstream of hydraulic structures is one of the most severe problems which may endanger the efficiency of their appurtenances and threaten the stability of stilling basins. Knowledge of sediment laden fluid hydraulics would be vital to understand the characteristics of the scour evolution to estimate a pertinent protection criterion downstream of stilling basins. The scour phenomenon has been widely studied by several researchers which go back to early twentieth. Despite the importance of the bed protection downstream of stilling basins, few works have been reported which, dictates the necessity of more research works in this regards. The present work encounters the investigation of riprap protection downstream of a stilling basin which served to an Ogee spillway as an energy dissipater. Starting with review of previous works, an experimental program was designed to investigate the pertinent size of a riprap protection downstream of a stilling basin in accordance with the characteristics of the incoming flow. The analysis was made on the base of dimensional analysis which resulted in design curves and relationships to determine the acceptable criterion for riprap protection downstream of a stilling basin in relation to mean flow properties.
Year: 2004