Modeling Bedload Transport Trajectories along a Sine-generated Channel

Donatella Termini, Li He, Dong Chen, Yafei Jia, Li He, Yaoxin Zhang

Risultato della ricerca: Articlepeer review

Abstract

This study explores the influences of flow discharge and particle size on bedload transport trajectoryby applying a depth-averaged two-dimensional model to a 110° sine-generated laboratory flume withwide-and-shallow sections. Calculated results exhibit two erosion regions in a bend: Zone-1 ‒ foreside of thepoint bar near the convex bank and Zone-2 ‒ near the apex of the concave bank. Sediments eroded fromZone-1 are mainly transported along the same-side convex bank rather than crossing the channel centerline,indicating the crucial role of longitudinal flow in shaping point bars. Most particles from Zone-2, however,behave more complicated by changing their trajectories with the developing bar-pool topography. Besides,sensitivity analyses indicate that, the shifting of bedload trajectory in the curved channel is not susceptible toparticle size while considerably varies with flow discharge. Moving particles in a meandering channel are ultimatelyconstrained within the belt of “concave bank‒crossing bar‒concave bank” after the bend topographyis fully developed and the bed deformation reaches a dynamic equilibrium.
Lingua originaleEnglish
pagine (da-a)542-552
Numero di pagine11
RivistaWater Resources
Volume46
Stato di pubblicazionePublished - 2019

All Science Journal Classification (ASJC) codes

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