Experimental Analysis of the Source and Sink Relationship in a Meandering Bend

  • Li HE
Keywords: experimental flume; depth-averaged velocity; bed deformation; pool-bar complexes; source-sink relation

Abstract

The source-sink-relationships in natural rivers are compound results of various influencing factors, and correlated fitted equations are kind of qualitative description. Experiment analyses was conducted in a laboratory flume to reach a quantitative description, whose center line follows a sine-generated curve with deflection angle of 30 degree. Three-dimensional velocities, bed deformation and composition of the pool-bar complexes in the meander bend are analyzed. The comparison of deformed bed and the depth-averaged velocities founds that, the maximum depth-averaged velocities of sections around the transition reach occurred at the edge of pool with smaller transverse slope, and the maximum depth-averaged velocities for sections around the apex section occurred at the edge of pool with larger transverse slope. Quantitative analysis of the composition of pool-bar complexes revealed the source-sink relation of moved particles. It shows that, moved particles sourced from the concave bank are mainly come from area down the apex section, and moved particles sourced from the convex bank are mainly come from area upper the apex section. Besides, there exit an area with strong sediment exchange, namely the bar around the convex-side of the apex section.

Published
2018-02-24
Section
Articles