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An indicator to characterize hydrological alteration due to hydropeaking

Courret, Dominique and Baran, Philippe and Larinier, Michel An indicator to characterize hydrological alteration due to hydropeaking. (2021) Journal of Ecohydraulics. 1-18. ISSN 2470-5357

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Official URL: https://doi.org/10.1080/24705357.2020.1871307

Abstract

Hydropeaking by hydroelectric facilities generates sudden changes in river flows and can affect the composition, abundance and structure of fish and invertebrate populations over long distances. To assess the level of hydrological alteration, as a factor of risk of biological impacts, a synthetic indicator was developed. Based on the analysis of 97 hydrometric stations and 1 575 years of unaltered flow data, rates of change in flow were calculated. Formulas representing the fastest natural variations, depending on the mean stream flow, the type of variation (increase or decrease) and the range of variation were established. Based on the analysis of 80 hydrometric stations and 491 years of flow data affected by hydropeaking, a method was developed to identify hydropeaks, essentially defined as variations with a rate of change greater than the maximum natural value computed using the formulas. A synthetic indicator differentiating five levels of hydrological alteration was developed using linear discriminant analysis based on five parameters characterizing hydropeaking regimes. Examples show that this indicator is sensitive to changes in the management of hydroelectric facilities and provides information on the spatial and temporal evolutions in hydropeaking regimes, including the progressive attenuation during downstream propagation.

Item Type:Article
Additional Information:This is an accepted manuscript of an article published by Taylor & Francis in Journal of Ecohydraulics on 15 Jun 2021 , available online: http://www.tandfonline.com/doi/abs/10.1080/24705357.2020.1871307
Audience (journal):International peer-reviewed journal
Uncontrolled Keywords:
Institution:French research institutions > Centre National de la Recherche Scientifique - CNRS (FRANCE)
Other partners > Ecole Nationale Supérieure de Mécanique et d'Aérotechnique - ENSMA (FRANCE)
Université de Toulouse > Institut National Polytechnique de Toulouse - Toulouse INP (FRANCE)
Université de Toulouse > Université Toulouse III - Paul Sabatier - UT3 (FRANCE)
Other partners > Université de Poitiers (FRANCE)
Other partners > Office français de la biodiversité - OFB (FRANCE)
Other partners > Etudes et COnseils en Gestion de l'Environnement Aquatique - ECOGEA (FRANCE)
Laboratory name:
Funders:
Agence de l'eau Adour-Garonne (FRANCE) - Office français de la biodiversité - OFB (FRANCE)
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Deposited On:23 Jun 2021 14:54

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