Physical Modelling of Local Scour Downstream of Ogee Spillway

The local scour in the bed of rivers is a famous phenomenon that usually occurs as a result of the water action. In which becomes an important topic to study while designing hydraulic and strategic structures. Because of the complexity of the topic, no certain methodology was developed to predict the scour profile but the majority of the found results were based on experimental studies. It is worth to mention that the local scour downstream of the spillway is an essential reason for the partial or total collapse of the body of the spillway. In principle, the produced scour may have different shapes and specifications according to various factors, most importantly, the type and the shape of the structure, elevation of tailwater, nature and size of sediments and other hydraulic condition.

The purpose of this study is to investigate the local scour profile, location and depth downstream of S65E ogee spillway, a repeated structure along Kissimmee river, which are operated by South Florida Water Management District (SFWMD), USA. The investigation will be conducted on a physical model at the hydraulic laboratory of Gaziantep University, Turkey after suggesting some minor changes on the current design of spillway for the purpose of minimizing the resulted local scour under extreme conditions of drought and flooding.