The Process of Plunge Pool Bed Form Changes by a Vertical Jet Impinging Upon Non-Cohesive Sediment

Abstract

The scour process induced by plunging jets is an important topic for hydraulic engineers. It is important to forecast the various scour hole characteristics for avoiding the failure of a hydraulic structure. Base on this evidence, this study aimed to investigate the equilibrium morphology caused by vertical circular impinging jet. Aderibigbe andRajaratnam (1996) classified the flow patterns over asymptotic scour hole based on the values of the erosion parameter (Ec) and the pressure parameter (K) as either the strongly deflected Jet regime (SDJR) or the weakly deflected jet regime (WDJR). It appears that the two regimes are linked by a narrow transition regime. Chakravarti et al. (2013) conducted experiments to investigate the effect of static and dynamic scouring in plunge pool under submerged circular vertical jets. In this study, the process of changing the plunge pool bed form has been studied under vertical jet impinging upon non-cohesive sediment.

Keywords

• dynamic scour
• static scour
• vertical jet
• spray
• froude number of jet