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Master Thesis

Étude d'impacts des changements climatiques et socioéconomiques sur la ressource en eau, à l'échelle d'un bassin versant des Pyrénées Orientales : Le Tech

Abstract : This report presents a study of the impact of climatic and socio-economic driving forces on water resources in the catchment basin of the river Tech, in the Pyrénées Orientales (France). This study was carried out within the framework of the VULCAIN project, set up with the collaboration of BRGM, Meteo France and BRLi. The approach consisted in setting up hydrological models to simulate the flow in the Tech basin at mean (2020-2040) and longer term (2040-2060), and to assess the vulnerability of this basin to both of the climatic and socioeconomic driving forces. To carry out this study, some data on present and future climate (according to 5 scenarios), and an assessment of present and future water withdrawal were used. First, the set up of the model on present data lead us to highlight the particular operating of the downstream sub-basin, because of the presence of a water table in alluvial deposits in this area. This part of the study also revealed that the water withdrawals that were assessed were underestimated, probably because of additional agricultural water withdrawal, that had not been taken into account at first. This study also revealed that, according to our future hydrological simulations, based on 5 climate scenarios established by Meteo France, climate change may have an impact on future flows in the river Tech from the short term (significant during the summer), and that this impact may be reinforced in the longer term, becoming significant for a wider period of time. According to our results, the presence of a water table in the downstream basin may limit the impact of climate change in this area. Besides, the study of the vulnerability carried out showed that the part of the impact ascribed to climate change is dominant, compared to the one ascribed to socioeconomic evolution. The approach highlighted the fact that the threshold that is chosen as a flow value that should not be overstepped during low water periods (DOE) is highly strategic, and depends on political issues. Indeed, the measures that have to be set in order to reduce water deficit can be really different, depending on the threshold chosen.
Document type :
Master Thesis
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https://dumas.ccsd.cnrs.fr/dumas-00748510
Contributor : Mémoires Agroparistech <>
Submitted on : Monday, November 5, 2012 - 12:30:02 PM
Last modification on : Tuesday, May 25, 2021 - 8:47:08 AM
Long-term archiving on: : Wednesday, February 6, 2013 - 3:54:21 AM

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  • HAL Id : dumas-00748510, version 1

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Daphney Dagneaux. Étude d'impacts des changements climatiques et socioéconomiques sur la ressource en eau, à l'échelle d'un bassin versant des Pyrénées Orientales : Le Tech. Milieux et Changements globaux. 2010. ⟨dumas-00748510⟩

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