Analysis of groundwater level historical data to detect climate change impact in France

Abstract : The level of groundwater bodies depends for many of them on the infiltration of meteoric water and willthereforebenecessarilyimpacted by climate change if it causes a change in the infiltration system (intensity, period). To assess and monitor the impact of this change, a dedicatedgroundwater monitoring network isnecessary. As this impact iscurrentlyunclear, the implementation of such a network involves an analysis of existinggroundwaterlevel data series. The studywasbased on modifiedMann-Kendall and Pettitt tests fromgroundwaterlevel data and a comparison of trends betweengroundwaterlevel data and climate data (precipitation, temperature, potentialevapotranspiration). Trend detection tests werecarried out on 377 piezometers of the french national groundwater quantitative monitoring network for whichwehad a data series of at least 25 years. In the end, 70 have a significant trend, 44 down and 26 up. Piezometersshowingsignificant trend mostlyconcernaquiferswithpredominantannualhydrologic cycle. But most of aquifers in France have longer hydrologic cycles and statistical tests do not permit to distinguishbetweenclimatic and anthropogenic influence. The conclusion of thisstudyisthatwecannotdemonstrate a significant impact of climate change on groundwaterlevels but itreinforces the need to set up a monitoring network dedicated to the impact of climate change on groundwater. In order to set up that network, about 40 aquiferswereselectedwithfollowingcreteria : unconfinedaquifer, recharge likely to beimpacted by climate change, aquiferweaklyimpacted by withdrawals.For each selectedaquifer,a monitoringwell or a springwasselected, based ona number ofcriteria andin particular the factthat the wellis inside an unconfined aquifer which is not influencedbypumping. They will constitute a new groundwater monitoring metanetworkto cover monitoring of climate change
Type de document :
Communication dans un congrès
43th AIH Congress, Sep 2016, Montpellier, France. 2016
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https://hal-brgm.archives-ouvertes.fr/hal-01331305
Contributeur : Jean-François Vernoux <>
Soumis le : lundi 13 juin 2016 - 16:56:59
Dernière modification le : mercredi 12 octobre 2016 - 01:27:46

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  • HAL Id : hal-01331305, version 1

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Jean-Jacques Seguin, Jean-François Vernoux. Analysis of groundwater level historical data to detect climate change impact in France. 43th AIH Congress, Sep 2016, Montpellier, France. 2016. 〈hal-01331305〉

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