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Proceedings of the International Association of Hydrological Sciences An open-access publication for refereed proceedings in hydrology
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Volume 365
Proc. IAHS, 365, 55–60, 2015
https://doi.org/10.5194/piahs-365-55-2015
© Author(s) 2015. This work is distributed under
the Creative Commons Attribution 3.0 License.
Proc. IAHS, 365, 55–60, 2015
https://doi.org/10.5194/piahs-365-55-2015
© Author(s) 2015. This work is distributed under
the Creative Commons Attribution 3.0 License.

  02 Mar 2015

02 Mar 2015

Prediction of streamflow from the set of basins flowing into a coastal bay

A. De Lavenne1,2 and C. Cudennec1,2 A. De Lavenne and C. Cudennec
  • 1INRA, UMR1069, Sol Agro et hydrosystème Spatialisation, 35000 Rennes, France
  • 2AGROCAMPUS OUEST, UMR1069, Sol Agro et hydrosystème Spatialisation, 35000 Rennes, France

Keywords: ungauged basin, model, geomorphology-based model, regionalisation, inversion, transposition

Abstract. Many coastal basins of the Brittany peninsula (France) display a high level of nitrate pollution, nine of them highlighted by the European Commission since 2007, as causing algal blooms in several coastal bays. To precisely diagnose and solve this issue the fluxes of every contributing basin have to be considered. However, this faces a strong data-scarce situation as most of the basins are ungauged. In this context, we propose to transpose hydrological information from one gauged basin to neighbouring points of interest. The methodology uses a simple geomorphology-based transfer function on the gauged basin, which allows assessment of the net rainfall time series through the de-convolution of the gauged discharge series. This net rainfall is then transposed and convoluted on the ungauged basin using its own transfer function in order to estimate discharge. This approach enables the quantification of the whole volume of freshwater entering the controversial Saint-Brieuc Bay.

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