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Water 2018, 10(5), 617; https://doi.org/10.3390/w10050617

Time-Lapse Photography of the Edge-of-Water Line Displacements of a Sandbar as a Proxy of Riverine Morphodynamics

1
Interdepartmental Centre for Industrial Research in Building and Construction, University of Bologna, 40126 Bologna, Italy
2
Department of Hydrology and Water Resources Management, Brandenburg University of Technology, 03046 Cottbus, Germany
3
Department of Civil, Chemical, Environmental, and Materials Engineering, University of Bologna, 40126 Bologna, Italy
*
Author to whom correspondence should be addressed.
Received: 26 March 2018 / Revised: 3 May 2018 / Accepted: 6 May 2018 / Published: 9 May 2018
(This article belongs to the Special Issue Watershed Hydrology, Erosion and Sediment Transport Processes)
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Abstract

A simple methodology to track the displacements of a sandbar from a fixed video camera, extracting its morphological features and deriving the associated fluvial morphology is presented, using a small reach of the Po River in Italy as a case study. A camera fixed on a bridge pier acquired images every twelve hours while hourly water levels are derived from a radar hydrometer located upstream of the study area. The quantification of the fluvial bathymetry is achieved by mapping multiple edge-of-water lines of a sandbar before and after high flow conditions in December 2017. Both from video information and 2-D numerical simulations, it is evident that flooding waves can easily remove sediments that accumulated on bars during low flow conditions in this area, redistributing them across the river channel. This video-based methodology—which confirms to be economically attractive if compared to more traditional monitoring systems—proves to be a valuable system to monitor long-term fluvial processes providing detailed indications on how to better plan river management activities. View Full-Text
Keywords: edge-of-water line; sandbar; video camera; iRIC model; river morphodynamics; Po River; time-lapse photogrammetry edge-of-water line; sandbar; video camera; iRIC model; river morphodynamics; Po River; time-lapse photogrammetry
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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Nones, M.; Archetti, R.; Guerrero, M. Time-Lapse Photography of the Edge-of-Water Line Displacements of a Sandbar as a Proxy of Riverine Morphodynamics. Water 2018, 10, 617.

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