Nonlinear Shear Effects of the Secondary Current in the 2D Flow Analysis in Meandering Channels with Sharp Curvature

In order to analyze the shear effect of secondary currents on flow structures in a meandering channel, this research developed two-dimensional shallow water model, which included dispersion stress term accounting for vertical velocity profile. A new equation profile that nonlinear effects was derived from motion channel with sharp curvature. Using experiment data obtained large-scale channels, ratio depth over radius-of-curvature incorporated into intensity proposed equation. Comparisons experimental results by previous showed computed values primary distribution model better fit observed than simulations linear models and without consideration. The simulated channels demonstrated added modeling gave higher accuracy, reducing relative error 19% reproducing skewed distributions particularly regions where spiral were strong, due meanders.