| Text | 420678 2020 10.1111/1365 2664.13590 Scopus 2 s2.0 85081218652 ecological flow environmental policy freshwater ecosystem water management Accounting for flow intermittency in environmental flows design Acuna V.; Jorda Capdevila D.; Vezza P.; De Girolamo A.M.; McClain M.E.; Stubbington R.; Pastor A.V.; Lamouroux N.; von Schiller D.; Munne A.; Datry T. Catalan Institute for Water Research ICRA , Girona, Catalan Institute for Water Research ICRA , Girona, Spain, , Spain; Universitat de Girona UdG , Girona, Universitat de Girona UdG , Girona, Spain, , Spain; Department of Environment, Land and Infrastructure Engineering DIATI , Politecnico di Torino, Torino, Department of Environment, Land and Infrastructure Engineering DIATI , Politecnico di Torino, Torino, Italy, , Italy; Water Research Institute, National Research Council IRSA, CNR , Bari, Water Research Institute, National Research Council IRSA, CNR , Bari, Italy, , , Italy; Water Research Institute, National Research Council IRSA, CNR , Bari, Water Research Institute, National Research Council IRSA, CNR , Bari, Italy, , , Italy; Department of Water Science and Engineering, IHE Delft Institute for Water Education, Delft, Department of Water Science and Engineering, IHE Delft Institute for Water Education, Delft, The Netherlands, , Netherlands; Faculty of Civil Engineering and Geosciences, Delft University of Technology, Delft, Faculty of Civil Engineering and Geosciences, Delft University of Technology, Delft, The Netherlands, , , Netherlands; Faculty of Civil Engineering and Geosciences, Delft University of Technology, Delft, Faculty of Civil Engineering and Geosciences, Delft University of Technology, Delft, The Netherlands, , , Netherlands; School of Science and Technology, Nottingham Trent University, Nottingham, School of Science and Technology, Nottingham Trent University, Nottingham, UK, , United Kingdom; Centre for Ecology, Evolution and Environmental Changes CE3C , Climate Change Impacts, Adaptation and Modelling CCIAM , Faculdade de Ciencias da Universidade de Lisboa, Lisbon, Centre for Ecology, Evolution and Environmental Changes CE3C , Climate Change Impacts, Adaptation and Modelling CCIAM , Faculdade de Ciencias da Universidade de Lisboa, Lisbon, Portugal, , Portugal; IRSTEA Lyon, RiverLy Research Unit, Villeurbanne, IRSTEA Lyon, RiverLy Research Unit, Villeurbanne, France, , France; Serra Hunter, Department of Evolutionary Biology, Ecology and Environmental Sciences, Faculty of Biology, University of Barcelona, Barcelona, Serra Hunter, Department of Evolutionary Biology, Ecology and Environmental Sciences, Faculty of Biology, University of Barcelona, Barcelona, Spain, , Spain; Catalan Water Agency ACA , Barcelona, Catalan Water Agency ACA , Barcelona, Spain, , Spain River ecosystems world wide are affected by altered flow regimes, and advanced science and practice of environmental flows have been developed to understand and reduce these impacts. But most environmental flows approaches ignore flow intermittency, which is a natural feature of 30% of the global river network length. Ignoring flow intermittency when setting environmental flows in naturally intermittent rivers might lead to deleterious ecological effects. We review evidence of the ecological effects of flow intermittency and provide guidance to incorporate intermittency non flow events into existing methods judged as suitable for application in temporary waterways. To better integrate non flow events into hydrological methods, we propose a suite of new indicators to be used in the range of variability approach. These indicators reflect dry periods and the unpredictable nature of temporary waterways. We develop a predictability index for protecting those species adapted to temporary conditions. For hydraulic habitat models, we find that mesohabitat methods are particularly effective for describing complex habitat dynamics during dry phases. We present an example of the European eel to show the relationship between discharge and non flow days and wet area, habitat suitability and connectivity. We find that existing holistic approaches may be applied to temporary waterways without significant structural alteration to their stepwise frameworks, but new component methods are needed to address flow related aspects across both flow and non flow periods of the flow regime. Synthesis and applications. Setting environmental flow requirements for temporary waterways requires modification and enhancement of existing approaches and methodologies, most notably the explicit consideration of non flow events and greater integration of specific geomorphic, hydrogeologic and hydraulic elements. Temporary waterways are among the freshwater ecosystems most vulnerable to alterations in flow regimes, and they are also under great pressure. The methodological modifications recommended in this paper will aid water managers in protecting key components of temporary flow regimes, thereby preserving their unique ecology and associated services. 57 Published version http //www.scopus.com/record/display.url eid=2 s2.0 85081218652 origin=inward Articolo in rivista Blackwell, 0021 8901 Journal of applied ecology Print Journal of applied ecology Print J. appl. ecol. Print Journal of applied ecology. Print annamaria.degirolamo DE GIROLAMO ANNA MARIA TA.P04.005.006 Gestione a scala di bacino delle risorse idriche e sostenibilita dell uso irriguo in agricoltura |
