Experimental investigation of the effect of transversal distance of cubic obstacles on the hydraulic characterization of transverse waves in the staggered arrangement

Document Type : Research Article

Authors

Department of Water Structures, Faculty of Water and Environmental Engineering, Shahid Chamran University of Ahvaz, Ahvaz, Iran

Abstract

Transverse waves are formed by obstacles such as vegetation, bridge pier and dock in the flow path. This study investigated the effect of transversal distance of cubic obstacles on the hydraulic characterization of transverse waves with four wave modes in resonance. The obstacles were arranged staggered at two transversal distances and a constant longitudinal distance. All experiments were performed in a flume with a length of 16 m, a width of 1.25 m, and a height of 0.6 m. The flow discharge was varied between 30 and 38 lit/s in the experiments. The results showed that in resonance relative amplitude of the wave increases by increasing the transversal distance of obstacles (decreasing the density of obstacles) and the highest relative amplitude of 33% was obtained for T/D=9.6, wave mode IV and Q=30 lit/s. With the increase in discharge, the relative amplitude of the wave in each transversal distance and all four wave modes decreased. The Strouhal number value decreased with increasing the obstacles density. Using dimensional analysis and the experimental results, an equation was presented in this study to calculate the Strouhal number in resonance with the help of advanced statistical software and the results of the sensitivity analysis showed that the effect of the obstacle Reynolds number parameter on the Strouhal number is greater than other parameters, and by eliminating this parameter from the equation presented for the Strouhal number, decreased by 46%, and the RMSE and MAE errors become 2 times greater on average.

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Amirkabir Journal of Civil Engineering
Volume 56, Issue 5
2024
Pages 2-2

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