Experimental and numerical modeling studies of pore water pressure variations in Subpermafrost groundwater

• Main Authors: Rivière, Agnès, Goncalves, Julio, Jost, Anne, Font, Marianne
• Other Authors: Centre de Géosciences (GEOSCIENCES), Mines Paris - PSL (École nationale supérieure des mines de Paris), Université Paris Sciences et Lettres (PSL)-Université Paris Sciences et Lettres (PSL), Structure et fonctionnement des systèmes hydriques continentaux (SISYPHE), Université Pierre et Marie Curie - Paris 6 (UPMC)-École Pratique des Hautes Études (EPHE), Université Paris Sciences et Lettres (PSL)-Université Paris Sciences et Lettres (PSL)-Mines Paris - PSL (École nationale supérieure des mines de Paris), Université Paris Sciences et Lettres (PSL)-Centre National de la Recherche Scientifique (CNRS), Milieux Environnementaux, Transferts et Interactions dans les hydrosystèmes et les Sols (METIS), Université Paris Sciences et Lettres (PSL)-Université Paris Sciences et Lettres (PSL)-Centre National de la Recherche Scientifique (CNRS), Morphodynamique Continentale et Côtière (M2C), Université de Caen Normandie (UNICAEN), Normandie Université (NU)-Normandie Université (NU)-Institut national des sciences de l'Univers (INSU - CNRS)-Université de Rouen Normandie (UNIROUEN), Normandie Université (NU)-Centre National de la Recherche Scientifique (CNRS)
• Format: Conference Object
• Language: English
• Published: HAL CCSD 2011
• Subjects: Development and degradation of permafrost; subpermafrost groundwater; cold region processes; [SDU.ENVI]Sciences of the Universe [physics]/Continental interfaces; environment; [SDU.STU.CL]Sciences of the Universe [physics]/Earth Sciences/Climatology; [SDU.STU.HY]Sciences of the Universe [physics]/Earth Sciences/Hydrology; Ice; Jan Mayen; Longyearbyen; permafrost; Svalbard
• Online Access: https://hal.science/hal-01396673; https://hal.science/hal-01396673/document; https://hal.science/hal-01396673/file/Abstract_RIVIERE_EUCOPIII2010.pdf

International audience Development and degradation of permafrost di-rectly affect numerous hydrogeological processes such as thermal regime, exchange between river and groundwater, groundwater flows patterns and groundwater recharge (Michel, 1994).Groundwater in permafrost area is subdivided in-to two zones: suprapermafrost and subpermafrost which are separated by permafrost. As a result of the volumetric expansion of water upon freezing and as-suming ice lenses and frost heave do not form in a saturated aquifer, the progressive formation of per-mafrost leads to the pressurization of the subperma-frost groundwater (Wang, 2006). Therefore disap-pearance or aggradation of permafrost modifies the confined or unconfined state of subpermafrost groundwater. Our study focuses on modifications of pore water pressures of subpermafrost groundwater which could appear during thawing and freezing of soil. Numerical simulation allows elucidation of some of these processes.