Author(s): Zehra Buyuker; Joana Baltazar; Gokcen Bomba; Antonio Heleno Cardoso
Linked Author(s): António Heleno Cardoso, Joana Baltazar
Keywords: No Keywords
Abstract: Lateral water intakes built in the berms of mobile bed rivers and integrated in urban water supply systems or in diversion channels lead to the occurrence of a phenomenon known as the "Bulle effect". This phenomenon impacts on the sustainability of water diversion systems and leads to intricate engineering problems. Various engineering solutions have been tried to mitigate or solve these problems. The use of submerged vane-fields inserted in the bifurcation zone seems to be one of the most promising solutions. However, there is a considerable gap of knowledge regarding the hydro-morpho-dynamics of vane-controlled mobile-bed water diversions and the design criteria of vane-fields. For the purpose of deepening our understanding of the phenomena involved, an experiment was conducted in a rectangular T-linked channel system which consisted of a main channel and a smaller diversion channel. The flow field and bed morphology were measured after the bifurcation zone reached the equilibrium stage. The results demonstrated a significant reduction in sediment transported from the main channel to the diversion channel thanks to the presence of vanes. More remarkably, the vane-field prevented the diversion channel vortex to start from inside the main channel, contrarily to what has been observed in the absence of vanes.
Year: 2024