Glider-Based Active Acoustic Monitoring of Currents and Turbidity in the Coastal Zone
Type | Article | ||||||||
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Date | 2020-09 | ||||||||
Language | English | ||||||||
Author(s) | Gentil Mathieu1, Many Gaël1, 2, Durrieu De Madron Xavier1, Cauchy Pierre1, 3, Pairaud Ivane![]() ![]() |
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Affiliation(s) | 1 : CEFREM, CNRS, Université de Perpignan Via Domitia, 52 Avenue Paul Alduy, 66860 Perpignan, France 2 : LA, Observatoire Midi-Pyrénées, 14 Avenue Edouard Belin, 31400 Toulouse, France 3 : COAS, School of Environmental Sciences, University of East Anglia, Norwich NR4 7TJ, UK 4 : Univ Brest, CNRS, Ifremer, IRD, Laboratoire d’Océanographie Physique et Spatiale (LOPS), IUEM, F-29280 Plouzané, France 5 : CNRS-Sorbonne Universités (UPMC Univ. Pierre et Marie Curie, Paris 06)-CNRS-IRD-MNHN, UMR 7159, Laboratoire d’Océanographie et de Climatologie (LOCEAN), Institut Pierre Simon Laplace (IPSL), 4 Place Jussieu, F-75005 Paris, France 6 : IFREMER, DHYSED, ZI Pointe du Diable, 29280 Plouzané, France |
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Source | Remote Sensing (2072-4292) (MDPI AG), 2020-09 , Vol. 12 , N. 18 , P. 2875 (22p.) | ||||||||
DOI | 10.3390/rs12182875 | ||||||||
WOS© Times Cited | 2 | ||||||||
Note | This article belongs to the Special Issue Recent Advances in Ocean Physics, Geochemistry and Biology from Unmanned Marine Vehicles | ||||||||
Keyword(s) | glider, optics, acoustics, satellite, coastal hydrodynamics, suspended particulate matter, particulate fluxes, Gulf of Lions, Mediterranean | ||||||||
Abstract | The recent integration of Acoustic Doppler Current Profilers (ADCPs) onto underwater gliders changes the way current and sediment dynamics in the coastal zone can be monitored. Their endurance and ability to measure in all weather conditions increases the probability of capturing sporadic meteorological events, such as storms and floods, which are key elements of sediment dynamics. We used a Slocum glider equipped with a CTD (Conductivity, Temperature, Depth), an optical payload, and an RDI 600 kHz phased array ADCP. Two deployments were carried out during two contrasting periods of the year in the Rhone River region of freshwater influence (ROFI). Coastal absolute currents were reconstructed using the shear method and bottom tracking measurements, and generally appear to be in geostrophic balance. The responses of the acoustic backscatter index and optical turbidity signals appear to be linked to changes of the particle size distribution in the water column. Significantly, this study shows the interest of using a glider-ADCP for coastal zone monitoring. However, the comparison between suspended particulate matter dynamics from satellites and gliders also suggests that a synoptic view of the processes involved requires a multiplatform approach, especially in systems with high spatial and temporal variability, such as the Rhone ROFI area. |
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