Author(s): C. V. Alonso; F. D. Shields Jr.; D. M. Temple
Linked Author(s): Carlos V. Alonso
Keywords: No Keywords
Abstract: Knowledge of hydrodynamic forces on single bodies is applied to the problem of measuring drag and lift of large wood (LW) in the form of branching logs and root wads submerged in steady, uniform flows representative of conditions encountered in natural streams. Drag and lift are characterized using drag and lift coefficients that are not known a priori due to the complexity of the flow and LW geometry. Parametric charts are presented detailing the dependence of time-mean drag and lift coefficients on LW geometry and orientation. The results exhibit lack of scaling similarity, and they also suggest assumed drag and lift coefficients for large wood in rivers may be misleading when based on coefficients measured for single cylindrical logs.
Year: 2009