Visualization of the Bulle-Effect of River Bifurcations
TimeTuesday, July 246:30pm - 8:30pm
DescriptionThe proposed visualization will highlight the phenomenon of non-linear distribution of near-bed sediment at asymmetric river bifurcations, also known as the Bulle Effect. The visualized results were generated on Blue Waters (NCSA), using the open-source high-order spectral element based Navier-Stokes solver Nek5000 coupled with a Lagrangian particle tracking model developed for this study . The Bulle Effect causes sediment in the lower part of the water-column to preferentially move into the lateral-channel, even in cases where a relatively higher percentage of the total flow continues along the main-channel. This has implications for the construction of such channels for use in irrigation, navigation and delta restoration. The proposed visualization will emphasize the difference in dynamics of sediment traveling at different depths of the channel. Additional flow features, such as velocity or vortical structures, may be also visualized to enhance our understanding of the interactions between the flow and sediment.
 Dutta, S. (2017) Bulle-effect and its implications for morphodynamics of river diversions (Doctoral dissertation, University of Illinois at Urbana-Champaign)