2017/08/30 by Saiyu Yuan, Hongwu Tang, Yang Xiao +2
Agricultural and Biological Sciences · Engineering · Environmental Science · #Hydraulic flow and structures #Hydrology and Sediment Transport Processes #Soil erosion and sediment transport
paper · doi:10.1080/00221686.2017.1354932
crossref issued 2017/08/30 · crossref published 2017/08/30 · crossref published-online 2017/08/30 · openalex publication_date 2017/08/30 · crossref created 2017/08/30 · crossref published-print 2018/05/04 · crossref deposited 2018/10/01 · openalex created_date 2025/10/10 · crossref indexed 2026/08/01 · openalex updated_date 2026/08/01
The knowledge of the dynamics of urban channel confluences is insufficient as most past studies have focused on natural river confluences. This paper reports experimental observations on bed morphology and hydrodynamics of the urban confluences and their dependence to the discharge ratio. Typical hydrodynamic and morphological features such as the shear layer, helical cells, bars and scour holes are identified. Nevertheless, the presence of a region of low-velocity flow for a small discharge ratio differs from results obtained in previous studies. Two sand ridges associated with the corridors of the eroded sediment from the scour holes merge into a mid-stream bar. Results also show that the intense shear towards the bed by downwelling and upwelling flows involved in helical motions is responsible for the mid-stream scour hole.