LIDAR Observations of Free-Surface Time and Length Scales in Hydraulic Jumps
Publication: Journal of Hydraulic Engineering
Volume 146, Issue 4
Abstract
A hydraulic jump is a complex, rapidly varied flow phenomenon occurring in the transition from supercritical to subcritical flows. Hydraulic jumps are characterized by instationary motions including jump toe oscillations and free-surface fluctuations. A light detection and ranging (LIDAR) instrument was used to continuously record the time-varying free-surface features of fully aerated hydraulic jumps with fully developed inflow conditions and high spatial and temporal resolution. The free-surface features were analyzed with two processing methods considering a freely moving hydraulic jump and a case where each instantaneous hydraulic jump profile was shifted to the mean jump toe position. The results provided detailed dimensionless distributions of the mean profiles, as well as free-surface fluctuations and jump toe oscillations that increased with increasing Froude numbers. The high spatial resolution data provided continuous free-surface time and length scales along the hydraulic jumps. Largest free-surface scales were observed close to the jump toe linked with longitudinal oscillations of the hydraulic jumps, and the dimensionless free-surface scales increased with the Froude number. The present study provides new insights into free-surface turbulent structures, highlighting the strong relationship between jump toe movements and free-surface fluctuations in hydraulic jumps.
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Data Availability Statement
Some or all data, models, or code generated or used during the study are available from the corresponding author by request (raw LIDAR data and MATLAB postprocessing tools).
Acknowledgments
The authors thank Rob Jenkins and Larry Paice (WRL, UNSW Sydney) for their technical assistance.
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Published In
Journal of Hydraulic Engineering
Volume 146 • Issue 4 • April 2020
Copyright
©2020 American Society of Civil Engineers.
History
Received: Feb 11, 2019
Accepted: Aug 15, 2019
Published online: Jan 20, 2020
Published in print: Apr 1, 2020
Discussion open until: Jun 20, 2020
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