Journal article

Hydrological and thermal effects of hydropeaking on early life stages of salmonids: A modelling approach for implementing mitigation strategies

Roser Casas-Mulet, Svein Jakob Saltveit, Knut Tore Alfredsen

Science of The Total Environment | ELSEVIER SCIENCE BV | Published : 2016

Abstract

Alterations in hydrological and thermal regimes can potentially affect salmonid early life stages development and survival. The dewatering of salmon spawning redds due to hydropeaking can lead to mortality in early life stages, with higher impact on the alevins as they have lower tolerance to dewatering than the eggs. Flow-related mitigation measures can reduce early life stage mortality. We present a set of modelling tools to assess impacts and mitigation options to minimise the risk of mortality in early life stages in hydropeaking rivers. We successfully modelled long-term hydrological and thermal alterations and consequences for development rates. We estimated the risk of early life stag..

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Grants

Awarded by Centre for Environmental Design of Renewable Energy (CEDREN)


Funding Acknowledgements

The authors would like to thank the Centre for Environmental Design of Renewable Energy (CEDREN), who funded important parts of the work through the Research Council of Norway grant 201779. Thanks also to Marco Toffolon who provided access to the air2stream model and to Teklu Hailegeorgis and Ana Adeva Bustos for setting up the unregulated discharge model for Lundesokna.