Author(s): Zhi Yang; Biao Huang; David Zhu
Linked Author(s): David Z. Zhu
Keywords: Equal mobility erosion rate non-cohesive sediment sewer flushing
Abstract: Systematic experiments have been conducted on the hydraulic flushing behavior of two types of non-cohesive sediment beds, continuous deposition and localized deposit, in circular sewer pipes. The study investigated the relationship between the flushing quantity and system parameters, including approaching flow rate, particle size and fraction, deposition configuration and deposition location, under steady states. The results show that the flushing quantity increases with increasing flow rate, sediment height, and decreasing particle size under both deposition types. The flushing quantity decreases with time, especially for continuous deposition, with a sharp decrease in the initial flushing phase. Three types of bed surfaces (ripple, flat and dune) can be observed during flushing, influenced by the particle Reynolds number. An empirical equation for predicting sediment flushing quantity was proposed by analyzing shear stress and erosion rates through data fitting.
Year: 2025