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Erwan Rogard Master thesis produce during a training period of 3 months

Evaluation of the importance of the spatial variability of the kind of soil on water resources and on the storage of carbon in Europe in the model ORCHIDEE. Erwan Rogard Master thesis produce during a training period of 3 months in the Laboratory of Climate and Environment Sciences (LSCE).

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Erwan Rogard Master thesis produce during a training period of 3 months

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  1. Evaluation of the importance of the spatial variability of the kind of soil on water resources and on the storage of carbon in Europe in the model ORCHIDEE Erwan Rogard Master thesis produce during a training period of 3 months in the Laboratory of Climate and Environment Sciences (LSCE)

  2. PROBLEMATIC • Project Qdiv : Quantifying the Effects of Global Environmental Change on Terrestrial Plant Diversity • Requires models of dynamics of the vegetation adapted. • At the LSCE : Model ORCHIDEE,weak description of soils. • How this model reacts to a variation of the depth and the useful reserve of the soil on the water resources and on the storage of the carbon?

  3. GOAL • The dynamic model of the vegetation ORCHIDEE does not take care of the spatial variability of different kind of soil. • The goal of my training period was to study how sensitive was the model to the variation of two main parameters of spatial variability: depth and useful reserve.

  4. ORCHIDEE MODEL ORCHIDEE (ORganizing Carbon and Hydrology In Dynamic EcosystEms) : • Global and dynamic model of the continental biosphere including three kinds of processes: biophysical, biogeophysical and ecological. • Model based on a standard soil: • Depth : 2 meters • Useful reserve : 150 mm/m

  5. METHODS • Determination of the depth and useful reserve range to be simulate in the model on the base of the French soils data's produced by INRA. Average depth of French soils Average useful reserve of French soils Source : Unité Infosol de l’INRA d’Orléans

  6. METHODS • Production of simulations for soil depths of 50 cm, 1 m, 150 cm, 2 m and 3 m. After, for each soil depths, I produced 4 simulations with different useful reserves (75 mm/m to 300 mm/m). • Qualitative analysis of simulations model outputs on water balance (runoff, evaporation, transpiration, ...) and on carbon storage (Net Primary Productivity, ...).

  7. RUNOFF RESULTS Runoff : part of rainfall which drains away on soil area. When the depth or useful reserve increase water volume available in the soil increase runoff is then going to be lesser 0,5 m 1 m 1,5 m 2 m 3 m 75 mm/m 150 mm/m 225 mm/m 300 mm/m Runoff (mm/d) Runoff (mm/d) Average rainfall (mm/d) Average rainfall (mm/d) Pluies Pluies Effects of depth on runoff Effects of useful reserve on runoff

  8. RUNOFF RESULTS Runoff differentials maps confirm this tendency : Differences < 0 depth or useful reserve runoff Effects of useful reserve on runoff 300 mm/m – 75 mm/m (mm/d) Effects of depth on runoff 3 m – 50 cm (mm/d) Source : Cartes produites via le logiciel VCDAT sur la base des simulations ORCHIDEE

  9. CONCLUSION • To conclude, the ORCHIDEE model appears sensitive to variation of spatial variability parameters (depth and useful reserve). • THANKS FOR YOUR ATTENTION !

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