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Theses
Influence des flux d´eau souterraine entre une zone humide superficielle et un aquifère profond sur le fonctionnement hydrochimique des tourbières : Exemple des marais du Cotentin, Basse-Normandie
Influence des flux d´eau souterraine entre une zone humide superficielle et un aquifère profond sur le fonctionnement hydrochimique des tourbières : Exemple des marais du Cotentin, Basse-Normandie
Abstract : Holocene peatlands from Cotentin peatbogs lie on sandy aquifer sedimentary basins (K = 10-3 – 10-4 m.s-1) which exploitation leads to variable hydrogeological conditions on a given site. Two-years of hydrogeological and hydrochemical monitoring associated with hydrogeological numerical modelling of the wetland functioning allowed to show that:
- The hydrological functioning of the wetland is controlled by the underlying sandy aquifer and the peatland existence is directly linked to its presence;
- The hydrogeological conditions have a direct influence on the spatiotemporal variability of the site redox conditions and on biogeochemical reactions that take place in the peatland;
- The wetland modelling results demonstrate that these ecosystems are sensitive and vulnerable to anthropic pressure (pumping) and/or to global climate change.
- The hydrological functioning of the wetland is controlled by the underlying sandy aquifer and the peatland existence is directly linked to its presence;
- The hydrogeological conditions have a direct influence on the spatiotemporal variability of the site redox conditions and on biogeochemical reactions that take place in the peatland;
- The wetland modelling results demonstrate that these ecosystems are sensitive and vulnerable to anthropic pressure (pumping) and/or to global climate change.
https://tel.archives-ouvertes.fr/tel-00137757
Contributor : Chrystelle Auterives <>
Submitted on : Wednesday, March 21, 2007 - 5:46:27 PM
Last modification on : Thursday, January 14, 2021 - 11:41:14 AM
Long-term archiving on: : Tuesday, April 6, 2010 - 10:49:45 PM
Contributor : Chrystelle Auterives <>
Submitted on : Wednesday, March 21, 2007 - 5:46:27 PM
Last modification on : Thursday, January 14, 2021 - 11:41:14 AM
Long-term archiving on: : Tuesday, April 6, 2010 - 10:49:45 PM