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Chapitre D'ouvrage Année : 2020

Mapping of Estuarine Transport from Spatial Remote-Sensing Products: Application to Authie Bay (France)

Résumé

In many domains of application such as sedimentology, remote sensing may be used to fill the gap of field sampling. This gap is often due to unavailable logistics or inaccessible areas. It is recognized that sediment transport directions can be assessed from grain-size parameters of sediment samples, but the determination of transport trend patterns from grain-size remote sensed products has still not been carried out. The main objective of this study was to determine sediment transport trends in the Authie estuary (North of France) using Sentinel-2 data for different periods. This estuary is marked by a critical erosion of the northern shore due to a prograding sandy spit and a general sandfilling. In order to analyse seasonal variations, a set of 4 images were analysed for a period between 2016 and 2018, two during summer and two during winter. A new methodology was developed for mapping sediment transport trend based on grain-size parameters (mean, sorting and skewness) determined from remote sensing data. Three sectors of the estuary were selected according to their main morphodynamics characteristics (e.g. critical erosion and sandfilling sectors). The resulting transport vectors were spatially coherent with sedimentary bedforms (i.e. megaripple) and consistant with known transport directions. Maps of potential sediment transport show spatial variation between summer and storm periods. Our results suggest a changes according the period and some vectors demonstrate a change in direction following the formation of new structures or channel deviations. This study demonstrates that remote sensing combined to grains-size trend analysis can be a useful approach for sediment transport trends determination with a high spatial resolution. Further investigations are needed to identify the role of topographic variations and to obtain a long-term transport trend in order to understand as the spatial variability in sandfilling and erosion processes within the estuary.
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Dates et versions

hal-04309806 , version 1 (27-11-2023)

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Benoit Menuge, Vincent Sipka, Charles Verpoorter, Arnaud Héquette. Mapping of Estuarine Transport from Spatial Remote-Sensing Products: Application to Authie Bay (France). Estuaries and Coastal Zones in Times of Global Change : Proceedings of ICEC-2018, Springer Singapore, pp.809-830, 2020, Springer Water, 978-981-15-2080-8. ⟨10.1007/978-981-15-2081-5_47⟩. ⟨hal-04309806⟩
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