Thermal anomalies and paleoclimatic diffusive and advectivephenomena: example of the Anglo-Paris Basin, northern France
| Autor: | Simon Lopez, Jacques Dentzer, Sophie Violette, Dominique Bruel |
|---|---|
| Přispěvatelé: | Laboratoire de géologie de l'ENS (LGENS), Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Département des Géosciences - ENS Paris, École normale supérieure - Paris (ENS Paris), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-École normale supérieure - Paris (ENS Paris), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL), Bureau de Recherches Géologiques et Minières (BRGM) (BRGM), Centre de Géosciences (GEOSCIENCES), MINES ParisTech - École nationale supérieure des mines de Paris, Région Île-de-France |
| Jazyk: | angličtina |
| Rok vydání: | 2017 |
| Předmět: |
geography
geography.geographical_feature_category 010504 meteorology & atmospheric sciences Advection Flux [SDU.STU]Sciences of the Universe [physics]/Earth Sciences Aquifer Sedimentary basin Structural basin 010502 geochemistry & geophysics Permafrost 01 natural sciences Heat flux 13. Climate action Earth and Planetary Sciences (miscellaneous) Groundwater flow . Heat flux and thermal regime . Numericalmodeling . France Geomorphology Geothermal gradient Geology ComputingMilieux_MISCELLANEOUS 0105 earth and related environmental sciences Water Science and Technology |
| Zdroj: | Hydrogeology Journal Hydrogeology Journal, Springer Verlag, 2017, pp.1-15. ⟨10.1007/s10040-017-1592-2⟩ |
| ISSN: | 1431-2174 1435-0157 |
| Popis: | This study is the first quantification of the combined impact of diffusive and advective paleoclimatic phenomena to explain the weak vertical thermal flux anomaly in the upper part of the Anglo-Paris intracratonic sedimentary basin in northern France. The aim of the research is to understand the mechanisms at the origin of the thermal flux anomaly at the level of the Meso-Cenozoic sediment pile. Based on a temperature profile representative of the basin, transient thermo-hydraulic simulations were performed along a representative vertical cross-section of about 400 km within the Lower Cretaceous multi-layer aquifer. Four paleoclimatic scenarios are the combination of two paleotemperature climatic forcings and two hydrodynamic regimes, one of them taking into account the interruption of the recharge linked to permafrost development. The simulation results clearly show the transient nature of the basin’s thermal regime. Then, for the reference well, the majority of the thermal flux anomaly can be explained by advective and paleoclimatic mechanisms with a decrease in geothermal flux simulated up to a little over 30 mW/m2, depending on the scenarios. Decrease in heat flux because of basin-scale subsurface flows in the Lower Cretaceous is around 15 mW/m2. There are several ways forward from this first simple model, including simulation of development of permafrost and also the integration of vertical flows in the basin by use of a three-dimensional model to better explain the data. |
| Databáze: | OpenAIRE |
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