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Typologie des impacts potentiels des ouvrages hydroélectriques sur les populations de truite situées en aval

Abstract : Research conducted on Brown trout populations downstream of impoundments has showed the influence of several natural constraints. First, population dynamics analysis of 3 Brown trout (Salmo trutta) populations, along with a multiple-sites analysis (53 stations) of relationships between by-passed sections populations and their physical habitat templet, showed several structuring factors. The first filter is stream width. On top of that, natural flood events constrain the populations. Furthermore, habitat fragmentation related to the size of each dam affects juveniles variability, while flow replenishment along the bypassed section parlty determines trout abundance. The second step consisted in characterizing the physical habitat in which the different salmonid regulated reaches are to be found, for the entire hydroelectric EDF (Electricité de France) facilities. 15 types were established, based on their mountain range (Alps, Pyrénées and Massif Central), on the combination of two major hydromorphological variables (stream gradient and mean annual streamflow), and on the flow-sediment regime. Finally, litterature general knowledge on impacts of impoundments on trout populations and specific knowledge from the multiple-sites analysis were combined with the different types of regulated reaches physical habitats. General knowlege on stream habitats sensitivity of a given area can be gained from this combination. Using these results, it is possible to build an ecological risk assessment framework for bypassed reaches trout populations : this framework assess the risk related to a given impoundment, risk which comes on top of preexisting physical natural constraints defined according to the type the reaches belong to.
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https://pastel.archives-ouvertes.fr/pastel-00575427
Contributor : Gwenaëlle Fahrner <>
Submitted on : Thursday, March 10, 2011 - 11:10:56 AM
Last modification on : Monday, May 18, 2020 - 2:35:31 PM

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Gwenaelle Fahrner. Typologie des impacts potentiels des ouvrages hydroélectriques sur les populations de truite situées en aval. Biodiversité et Ecologie. AgroParisTech, 2010. Français. ⟨NNT : 2010AGPT0092⟩. ⟨pastel-00575427⟩

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