CHAPUIS , Margot

Fieldtrip of the Hydrosystems' Commission of the CNFG (French National Committee of Geography), July 2023. Fieldtrip organized by Margot Chapuis (Université Côte d'Azur, UMR 7300 ESPACE) thanks to the help of the Hydrosystems' Commission supervisors: Anaëlle Vayssière and Ludovic Drapier.

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Aiming at a long term and sustainable river corridor management requires to consider the complexity of forms and processes affecting the various compartments of the hydrosystem (biotopes and biocenosis), at different spatial and temporal scales. Starting from a coupled geomorphological and biogeographical approach, we analyze some of the...

The Roya is a 60 km-long semi-alluvial riverbed, with alpine/mountain influence upstream and Mediterranean influence downstream. It is characterized by steep and narrow gorges (mean slope: 3.2%) on long reaches, and a local wandering pattern when the narrow valley floodplain allows it (mean active width: 40 m). Sediment load on the catchment...

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Braided rivers are characterised by a multichannel pattern maintained by a dynamic hydrologic regime with alternance of floods and low water periods. In this context, the aquatic habitat mosaic displays high turnover rates. Nevertheless, benthic invertebrate communities present in these systems are adapted to these dynamic...

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Braided rivers are dynamic hydrosystems characterised by a multiple channels morphology and a marked hydrology with high amplitude variations and high diversity of macro-, meso-and microhabitats: channel types, geomorphic units and flowing conditions. After the WFD publication¹ and the objective to achieve good ecological status, restoration...

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Continuazione degli studi relativi alla tempesta Alex svolti dal CNRS: 1/ Mappatura della precipitazione accumulata in valle durante la tempesta Alex; 2/ Modellazione idrologica delle portate del Roia in Francia-Italia; 3/ Trasporto sedimentario nel Roia: scambio di esperienze dopo 7 anni di monitoraggio e modellazione dei flussi sedimentari...

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Instream channel restoration is a common practice in river engineering that presents a challenge for research. One research gap is the development of monitoring techniques that allow for testable predictions of sediment transport and supply. Here we use Radio Frequency Identification (RFID) transponders to compare the short-term (1-year)...

Les rivières en tresses sont des hydrosystèmes davantage étudiés depuis ces dernièresannées1,2. L'utilisation d'indicateurs permet de dresser un diagnostic sur ces milieux,notamment leur dynamique hydrosédimentaire. Dans un contexte actuel de restauration, denombreuses opérations sont entreprises sur ces milieux, afin d'atteindre le bon état...

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Documenting and interpreting channel responses to catastrophic floods help understanding how rapid fluvial metamorphosis can propagate in a catchment under sediment cascading effects. The recent example of the October 2020 Storm Alex in SE France (~ 500 mm of rain in 24 h) provides a unique opportunity to investigate major geomorphic responses...

The Var River (South-Eastern France) is currently undergoing an ambitious restoration project that aims at restoring its 'natural' active braiding pattern ('Mediterranean facies') on the channelized downstream reach of the river. As part of the ongoing feedback evaluation of such project, this study aims at: (1) quantifying the morphological...