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Discussion papers | Copyright
https://doi.org/10.5194/gmd-2018-39
© Author(s) 2018. This work is distributed under
the Creative Commons Attribution 4.0 License.

Development and technical paper 25 Apr 2018

Development and technical paper | 25 Apr 2018

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This discussion paper is a preprint. It is a manuscript under review for the journal Geoscientific Model Development (GMD).

Improvements of the hydrological processes of the Town Energy Balance Model (TEB-Veg, SURFEX v7.3) for urban modelling and impact assessment

Xenia Stavropulos-Laffaille1, Katia Chancibault1, Jean-Marc Brun1, Aude Lemonsu2, Valéry Masson2, Aaron Boone2, and Hervé Andrieu1 Xenia Stavropulos-Laffaille et al.
  • 1IFSTTAR, GERS, EE, 44344 Bouguenais, France
  • 2CNRM UMR 3589, Météo-France/CNRS, Toulouse, 31057 Toulouse CEDEX 1, France

Abstract. Climate change and demographic pressure are common issues to be considered when conducting urban planning. Local authorities and stakeholders have therefore opted for more nature-based adaptation strategies, which are especially suitable to influence both hydrological and energy processes. Assessing the multiple benefits of such strategies on the urban microclimate thus requires effective numerical tools. This paper presents recent developments of the water budget in the TEB-Veg model (SURFEX v7.3), which allows for a better representation of the hydrological processes of urban subsoil. This new hydrological module has been called TEB-Hydro. The developments studied concern the introduction of subsoil underneath built surfaces, and the processes of: horizontally rebalancing intra-mesh soil moisture, draining soil water via the sewer network, and limiting deep drainage in the aim of achieving a more realistic base flow pattern in the sewer system. A sensitivity analysis is then performed in order to identify the hydrological parameters required for model calibration. The new TEB-Hydro model is evaluated on two small residential catchments in Nantes (France) by comparing simulated sewer discharges to observation findings. In both cases, the model tends to overestimate total sewer discharge and performs better under wet climate conditions, with a KGE statistical criterion greater than 0.80 vs. roughly 0.60 under drier weather conditions. Yet these findings remain encouraging since the same set of model parameters are identified for both catchments, irrespective of meteorological and local physical conditions. This approach opens opportunities to apply the model at the city scale with respect to projections of climate and demographic changes.

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Xenia Stavropulos-Laffaille et al.
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Source code and run directories for Stavropulos-Laffaille et al. (GMD): Improvements of the hydrological processes of the Town Energy Balance Model (TEB-Veg, SURFEX v7.3) for urban modelling and impact assessment X. Stavropulos-Laffaille, K. Chancibault, J.-M. Brun, A. Lemonsu, V. Masson, A. Boone, and H. Andrieu https://doi.org/10.5281/zenodo.1218016

Model code and software

Source code and run directories for Stavropulos-Laffaille et al. (GMD): Improvements of the hydrological processes of the Town Energy Balance Model (TEB-Veg, SURFEX v7.3) for urban modelling and impact assessment X. Stavropulos-Laffaille, K. Chancibault, J.-M. Brun, A. Lemonsu, V. Masson, A. Boone, and H. Andrieu https://doi.org/10.5281/zenodo.1218016

Xenia Stavropulos-Laffaille et al.
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Integrating vegetation in urban planning is promoted to counter steer potential impacts of climate and demographic changes. Assessing the multiple benefits of such strategies on the urban microclimate requires a detailed coupling of both the water and energy transfers in numerical tools. In this respect, the representation of water related processes in the urban subsoil of the existing model TEB-Veg has been improved. The new model thus allows a better evaluation of urban adaptation strategies.
Integrating vegetation in urban planning is promoted to counter steer potential impacts of...
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