Journal
ENVIRONMENTAL MONITORING AND ASSESSMENT
Volume 188, Issue 2, Pages -Publisher
SPRINGER
DOI: 10.1007/s10661-015-5082-5
Keywords
Flow monitoring; Surface flow; Flow measurement; Flow velocity; Large-scale particle image velocimetry; Camera observations
Categories
Funding
- American Geophysical Union Horton (Hydrology) Research Grant
- Ministero degli Affari Esteri project Italy-USA [PGR00175]
- UNESCO Chair in Water Resources Management and Culture
- National Science Foundation [BCS-1124795]
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Monitoring surface water velocity during flood events is a challenging task. Techniques based on deploying instruments in the flow are often unfeasible due to high velocity and abundant sediment transport. A low-cost and versatile technology that provides continuous and automatic observations is still not available. Among remote methods, large-scale particle image velocimetry (LSPIV) is an optical method that computes surface water velocity maps from videos recorded with a camera. Here, we implement and critically analyze findings obtained from a recently introduced LSPIV experimental configuration during a flood event in the Tiber River at a cross section located in the center of Rome, Italy. We discuss the potential of LSPIV observations in challenging environmental conditions by presenting results from three tests performed during the hydrograph flood peak and recession limb of the event for different illumination and weather conditions. The obtained surface velocity maps are compared to the rating curve velocity and to benchmark velocity values. Experimental findings show that optical methods should be preferred in extreme conditions. However, their practical implementation may be associated with further hurdles and uncertainties.
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