Skip to Main content Skip to Navigation
Journal articles

Impact of climate change on groundwater point discharge: backflooding of karstic springs (Loiret, France)

Abstract : Under certain hydrological conditions it is possible for spring flow in karst systems to be reversed. When this occurs, the resulting invasion by surface water, i.e. the backflooding, represents a serious threat to groundwater quality because the surface water could well be contaminated. Here we examine the possible impact of future climate change on the occurrences of backflooding in a specific karst system, having first established the occurrence of such events in the selected study area over the past 40 yr. It would appear that backflooding has been more frequent since the 1980s, and that it is apparently linked to river flow variability on the pluri-annual scale. The avenue that we adopt here for studying recent and future variations of these events is based on a downscaling algorithm relating large-scale atmospheric circulation to local precipitation spatial patterns. The large-scale atmospheric circulation is viewed as a set of quasi-stationary and recurrent states, called weather types, and its variability as the transition between them. Based on a set of climate model projections, simulated changes in weather type occurrence for the end of the century suggests that backflooding events can be expected to decrease in 2075-2099. If such is the case, then the potential risk for groundwater quality in the area will be greatly reduced compared to the current situation. Finally, our results also show the potential interest of the weather-type based downscaling approach for examining the impact of climate change on hydrological sys tems.
Complete list of metadatas

Cited literature [20 references]  Display  Hide  Download

https://hal-insu.archives-ouvertes.fr/insu-00574519
Contributor : Nathalie Pothier <>
Submitted on : Monday, October 10, 2011 - 2:02:07 PM
Last modification on : Wednesday, September 25, 2019 - 2:56:01 PM
Long-term archiving on: : Sunday, December 4, 2016 - 10:04:48 AM

File

hess-15-2459-2011.pdf
Explicit agreement for this submission

Identifiers

Collections

Citation

Emmanuelle Joigneaux, Patrick Albéric, Hélène Pauwels, C. Pagé, L. Terray, et al.. Impact of climate change on groundwater point discharge: backflooding of karstic springs (Loiret, France). Hydrology and Earth System Sciences Discussions, European Geosciences Union, 2011, 15, pp.2459-2470. ⟨10.5194/hess-15-2459-2011⟩. ⟨insu-00574519v2⟩

Share

Metrics

Record views

452

Files downloads

373