Probabilistic Analysis of Debris Motion in Steady-State Currents for Varying Initial Debris Orientation and Flow Velocity Conditions
Publication: Journal of Hydraulic Engineering
Volume 147, Issue 9
Abstract
Floodborne debris impact loads depend on several factors, including debris orientation and velocity. Due to the random nature of turbulent flood flows, debris motions are inherently random. This study presents a probabilistic characterization of debris motions in steady-state currents with relatively high Reynolds numbers. An item of debris was released, multiple times, in the open channel flows, at two angles and three current velocities. The debris motions were recorded via a camera. The characteristics of the debris motions including the trajectory, orientation, and velocity were extracted using image processing and were analyzed statistically. The results indicate that the debris orientation and lateral displacement followed a Gaussian distribution. The current velocity and release angle had a smaller effect on the debris lateral displacement than did the orientation. The analysis also highlights the combined effect of the current velocity and release angle on the lateral displacement and orientation of the debris. Empirical relationships were developed for estimating the mean trajectory and orientation of debris in steady currents, as a function of the release angle, and Froude number.
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Data Availability Statement
Some or all data, models, or code that support the findings of this study are available from the corresponding author upon reasonable request. The data include videos of debris motion, as well as data files for debris position, orientation, and velocity (Kasaei et al. 2021).
Acknowledgments
This study was partially funded by the New York State Department of Environmental Conservation, Award No. 77362.
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Journal of Hydraulic Engineering
Volume 147 • Issue 9 • September 2021
Copyright
© 2021 American Society of Civil Engineers.
History
Received: Jun 11, 2020
Accepted: Apr 11, 2021
Published online: Jul 7, 2021
Published in print: Sep 1, 2021
Discussion open until: Dec 7, 2021
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