Tendances observées sur les régimes hydrologiques de l’Arc Alpin

Bard, Antoine; Renard, Benjamin; Lang, Michel

doi:10.1051/lhb/2012006

Cited by 7 publications

(2 citation statements)

References 14 publications

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“…An increase in the severity of hydrological droughts, in terms of both duration and intensity found to be related to climate change, has been observed in the Mediterranean basin (Aubé, 2017;Bard et al, 2012;Giuntoli et al, 2015;Marx et al, 2018;Ruiz-Villanueva et al, 2014;Sauquet et al, 2015;Van Vliet et al, 2013;Vidal et al, 2016). The increase in the severity of low-water levels contributes to degrading the water resources in terms of both quantity and quality (Nosrati, 2011;Chiogna et al, 2018), thus impacting ecosystems connected to the river (Folegot et al, 2018).…”

Section: Introductionmentioning

confidence: 99%

Identification of the contributing area to river discharge during low-flow periods

Gillet

Salle²,

Ayral

et al. 2021

Hydrol. Earth Syst. Sci.

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Abstract. The increasing severity of hydrological droughts in the Mediterranean basin related to climate change raises the need to understand the processes sustaining low flow. The purpose of this paper is to evaluate simple mixing model approaches, first to identify and then to quantify streamflow contribution during low-water periods. An approach based on the coupling of geochemical data with hydrological data allows the quantification of flow contributions. In addition, monitoring during the low-water period was used to investigate the drying-up trajectory of each geological reservoir individually. Data were collected during the summers of 2018 and 2019 on a Mediterranean river (Gardon de Sainte-Croix). The identification of the end-members was performed after the identification of a groundwater geochemical signature clustered according to the geological nature of the reservoir. Two complementary methods validate further the characterisation: rock-leaching experiments and unsupervised classification (k-means). The use of the end-member mixture analysis (EMMA) coupled with a generalised likelihood uncertainty estimate (GLUE) (G-EMMA) mixing model coupled with hydrological monitoring of the main river discharge rate highlights major disparities in the contribution of the geological units, showing a reservoir with a minor contribution in high flow becoming preponderant during the low-flow period. This finding was revealed to be of the utmost importance for the management of water resources during the dry period.

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Section: Introductionmentioning

confidence: 99%

Identification of the contributing area to river discharge during low-flow periods

Gillet

Salle²,

Ayral

et al. 2021

Hydrol. Earth Syst. Sci.

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“…Only snowmelt and glacial regime rivers are experiencing an increase in the intensity and volume of their floods and an evolution of their seasonality, with an earlier and longer snowmelt period (Bard et al, 2012).…”

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confidence: 99%

Climate change and natural hazards in the Alps

Einhorn¹,

Eckert²,

Chaix³

et al. 2015

rga

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AcknowledgmentsThe PARN thanks the members and partners of its scientific and technical network who contributed to the preparatory work for this review, and the Rhône-Alpes Region for its support of the Alps-Climate-Risks portal initiated in the ClimChAlp project alongside ONERC. The DREAL Rhône-Alpes is also acknowledged for its support of the PARN 'Projects' database, and of the transboundary database on Interreg territorial cooperation projects on natural hazards, developed within the partnership of the RiskNat and RiskNET Alcotra projects. Finally, we thank the two anonymous reviewers, whose suggestions have helped improve the manuscript.

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