Water restrictions under climate change: a Rhone-Mediterranean perspective combining 'bottom up' and 'top-down' approaches | Les restrictions en eau soumises au changement climatique : une perspective Rhône-Méditerranéenne conjuguant les approches 'bottom up' et 'top-down'

[Departement_IRSTEA]Eaux [TR1_IRSTEA]ARCEAU [TR2_IRSTEA]GEUSI [ADD1_IRSTEA]Adaptation des territoires au changement global [ADD2_IRSTEA]Hydrosystèmes et risques naturels<br/>I.S.RIVERS 2018, Lyon, FRA, 04-/06/2018 - 08/06/2018

International audience

English. Drought management plans require an overview of future climate conditions for ensuring long term relevance of existing decision-making processes. To that end, 'bottom up' approaches have been developed to best match decision-making needs as catchment intrinsic sensitivity to climate change. Due to severe low-flow and drastic snowpack decrease, Mediterranean-climate catchments are subject to substantial alterations of water availability in France. In order to adapt to these concerns, drought action plans including water restrictions have been set up by Prefecture in the Rhône-Méditerranée district. The objective of this study is to provide a perspective in catchment responses through potential water restrictions under climate scenarios. We have implement over 1958-2013 a 'bottom up' framework for analyzing responses of 105 catchments to a wide range of 1350 climate scenarios using response surfaces. In addition, a set of 'top-down' projections have been superimposed to visualize perspective at various time scales. Results from a first cluster analysis highlight potential needs to adapt water restrictions, mainly for temperature sensitive catchments more subject to consequent water restriction increase.