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Water and energy transfer modeling in a permafrost‐dominated, forested catchment of Central Siberia: the key role of rooting depth

Orgogozo, Laurent and Prokushkin, Anatoly S. and Pokrovsky, Oleg S. and Grenier, Christophe and Quintard, Michel and Viers, Jérôme and Audry, Stéphane Water and energy transfer modeling in a permafrost‐dominated, forested catchment of Central Siberia: the key role of rooting depth. (2019) Permafrost and Periglacial Processes, 30 (2). 75-89. ISSN 1045-6740

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Official URL: https://doi.org/10.1002/ppp.1995

Abstract

In order to quantify the impact of evapotranspiration phenomena on active layer dynamics in a permafrost-dominated forested watershed in Central Siberia, we performed a numerical cryohydrological study of water and energy transfer using a new open source cryohydrogeology simulator, with two innovative features: the spatially distributed, mechanistic handling of evapotranspiration and the inclusion of the developed numerical tool in the high performance computing tool box for numerical simulation of fluid dynamics OpenFOAM®. In this region, the heterogeneity of solar exposure leads to strong contrasts in vegetation cover, which constitute the main source of variability of hydrological conditions at the landscape scale. The uncalibrated numerical results reasonably reproduce the measured soil temperature profiles and the dynamics of infiltrated waters revealed by previous biogeochemical studies. The impacts of the thermo-hydrological processes on the water fluxes from the soils to the stream are discussed through comparison between numerical results and field data. The impact of evapotranspiration on water fluxes is studied numerically, which highlights a strong sensitivity to the variability of rooting depth and corresponding evapotranspiration at the slopes of different aspects in the catchment.

Item Type:Article
HAL Id:hal-02538303
Audience (journal):International peer-reviewed journal
Uncontrolled Keywords:
Institution:French research institutions > Commissariat à l'Energie Atomique et aux énergies alternatives - CEA (FRANCE)
French research institutions > Centre National d'Études Spatiales - CNES (FRANCE)
French research institutions > Centre National de la Recherche Scientifique - CNRS (FRANCE)
Université de Toulouse > Institut National Polytechnique de Toulouse - Toulouse INP (FRANCE)
French research institutions > Institut de Recherche pour le Développement - IRD (FRANCE)
Université de Toulouse > Université Toulouse III - Paul Sabatier - UT3 (FRANCE)
Other partners > Université de Versailles Saint-Quentin-en-Yvelines -UVSQ (FRANCE)
French research institutions > Bureau de Recherches Géologiques et Minières - BRGM (FRANCE)
Other partners > V. N. Sukachev Institute of Forest (RUSSIA)
Other partners > Tomsk State University - TSU (RUSSIA)
Laboratory name:
Funders:
Calcul en Midi-Pyrénées - CALMIP (France) - Partenariats Hubert Curien Campus France - PHC (France) - Russian Science Foundation - RSF (Russia)
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Deposited On:18 Mar 2020 11:05

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