Minimizing scour downstream of hydraulic structures using single line of floor water jets

Abstract

Local scour downstream of control structures may result in damage or complete failure of the control structure. In this paper, one hundred and seventeen runs were carried out to study the effect of single line of floor water jets on the scour hole parameters downstream of a control structure (Fayoum type weir) with different jet discharges, locations, and tailwater depths. Cases of floor without water jets were included to estimate the influence of using the suggested system. Obtained results were analyzed and graphically represented. The suggested system is easy to be used as an extra element to the existing structures to increase the performance of stilling basin. Results indicated that the system of suggested floor water jets gave from 50% to 90% reduction in maximum scour depth and from 42% to 85% reduction in scour hole length compared to the case of the floor without water jets.