Author(s): K. Shiono; T. Ishigaki; Y. Muto; H. Imamoto
Linked Author(s): Yasunori Muto, Taisuke Ishigaki
Keywords: Flood; Meandering channels; Boundary shear stress; Secondary flow
Abstract: Measurements of boundary shear stress in meandering channels for overbank flow were carried out using a Preston tube and a heated thin-film sensor. Both results of magnitude and distribution of the boundary shear stress in cross sections along the meandering channels are in good agreement, even in strong three-dimensional flow regions. Measurements of secondary flow were also carried out using a laser Doppler anemometer. The distributions of the boundary stress and secondary flow along the meandering channels for over bank flow show that locations of peak and dip on the boundary shear stress distribution well correspond to those of the secondary flow downwards and upwards motion respectively. Tractive force experiments were carried out and the result with supporting the result of the boundary shear stress suggests that a number of secondary flow cells exist in the latter half of the meandering channels.
Year: 1999