River corridors facing change in Alpine and Mediterranean climate: anthropogenic pressures vs. extreme events vs. climate change, a coupled geomorphic and ecologic point of view - Archive ouverte HAL
Communication Dans Un Congrès Année : 2024

River corridors facing change in Alpine and Mediterranean climate: anthropogenic pressures vs. extreme events vs. climate change, a coupled geomorphic and ecologic point of view

Les corridors fluviaux face au changement en contexte alpin et méditerranéen: pressions anthropiques vs. événements extrêmes vs. changement climatique, couplage entre approches géomorphologique et écologique

Résumé

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 reciprocal relationships between hydrosystem fluctuations and land use (society and/or biocenosis). This systemic approach requires to adopt multiple disciplines’ points of view to capture both the « ordinary regime » of the river and the consequences of an extreme event. Using cutting-edge methodologies in fluvial (bio)geomorphology, we aim at deciphering some aspects of the climate-society interactions, to understand both physical processes (pluri-annual series, extreme flood events) and their consequences on hydro-eco-systems and on land use planning strategies. We base our study on two examples that display typical characteristics of Alpine and Mediterranean hydrosystems and enable a regional analysis and bi-national considerations on river management. The Drac river example aim at: 1/ stressing the importance of considering channel types diversity (macroscale habitats) in restored braided rivers’ sampling protocol to assess their health status 2/ highlighting the major role of inter-annual variability of macroinvertebrates community composition compared to the river morphology driver in the absence of morphogenic flood (Devreux et al., 2022 and 2023). Starting from 1/ trout spawning habitats sediment dynamics and 2/ hillslopes’ vegetation and sediment dynamics, the Roya river displays a unique example of sediment tracking experiment undertaken on a bi-national catchment, before and after a 1000 yrs return period flood event. This constitutes a perfect occasion to explore 1/ land use planning policies on sediment yield on a historical perspective and 2/ climate change effects on river systems sediment dynamics (Chapuis et al., 2022; Chapuis and Adnès, 2023; Chapuis, submit.).
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hal-04649076 , version 1 (16-07-2024)

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Margot Chapuis. River corridors facing change in Alpine and Mediterranean climate: anthropogenic pressures vs. extreme events vs. climate change, a coupled geomorphic and ecologic point of view. Indo-French seminar “State of the Art Techniques in River Corridor Research and Management”, IIT Jammu; Inrae; CEFIPRA; IIT Delhi, Jul 2024, Delhi, India. ⟨hal-04649076⟩
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