Author(s): Felipe Condo-Colcha; Robert K. Niven; Matthias Kramer
Linked Author(s): Matthias Kramer, Robert K. Niven
Keywords: Plastic transport surface detachment turbulent lift
Abstract: In this study, we investigate the detachment mechanisms of circular plastic cylinder at the air-water interface in riverine systems, focusing on vertical forces induced by streamwise flow. Two bed configurations, a smooth and a rough bed, are analyzed under similar flow conditions. The slightly negatively buoyant cylindrical particles experience vertical forces measured using a force sensor. It is proposed that the vertical turbulent forces are related to the vertical turbulent velocity fluctuations, for which the shear velocity is computed through particle image velocimetry measurements. Results reveal that rough bed configurations significantly increase fluctuations in particles traveling at the air-water interface, indicating a stronger influence of turbulence. These findings contribute to understanding the transport dynamics of plastics in riverine systems.
Year: 2025