Author(s): Yang Xia, Sai-Yu Yuan, Yang Xiao, Hong-Wu Tang
Linked Author(s): Saiyu Yuan
Keywords: Channel confluence, adsorption, phosphorus, distribution, bed sediments
Abstract: Revealing the distribution of phosphorus uptake on bed sediments at the channel confluence is important for understanding the contaminant transport at confluence zone. Experiments have been carried out in a plexiglass circulating flume with a 90-degree junction to study the relation of the flow structure and the P distribution on bed sediments. The results show that the adsorption amount of P varied significantly in different hydraulic zones. In the separation zone, the adsorption amount of P is high as the flow is nearly static in this area. There is a low adsorption strip in the maximum velocity zone where the horizontal velocity reaches a maximum. The adsorption amount of P is low at the downstream of the distorted shear layer, but P enrichment is observed at the upstream of the distorted shear layer due to the significant downwelling flow in this area. Comparing with turbulence, velocity is the main factor affecting the distribution of P uptake on the bed sediment at channel confluence
Year: 2017