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Étude expérimentale et numérique du ruissellement de surface : effets des variations d'intensité de la pluie. Application à une parcelle de vigne en Cévennes-Vivarais.

Abstract : Through a cross-disciplinary approach, a study of the rain-dynamics and hillslope-length effects on runoff was carried out at plot scale. To achieve this, a vineyard plot in Ardèche was instrumented in order to implement runoff experiments under simulated and natural rainfall. Laboratory rainfall simulations completed this experimental ensemble via a reproducible artificial porous medium made of ceramic bricks. A distributed physically based model (PSEM_2D) was utilized and a conceptual model constituted of triangular section basins was created to reproduce the observed runoff. In steady regime, field rainfall simulations showed that runoff intensity do not depend on collected slope length. The responsibility of transitional regime on the non proportionality of runoff volume with slope length is put forward. Steady regime infiltration increase with rainfall intensity was observed in the field and in the laboratory. With microtopography, modeling results showed that a punctual hydraulic conductivity increase with elevation could explain the observed infiltration variation range in the field. An intermittent rainfall creates more runoff than a continuous rainfall of the same mean intensity as the simulated rainfall experiences showed. However, this effect was softened for heavy intensities due to the infiltration increase with rainfall intensity and to the superficial detention infiltrated between two flushes (estimated by the intermittent runoff deficit between intermittent and continuous rainfalls of same amount). This observation reinforces the use of hyetogram-independent runoff coefficients in hydrological models.
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Contributor : Matthieu Nicolas <>
Submitted on : Tuesday, May 4, 2010 - 8:03:29 PM
Last modification on : Thursday, November 19, 2020 - 3:54:29 PM
Long-term archiving on: : Thursday, September 16, 2010 - 12:51:33 PM

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Matthieu Nicolas. Étude expérimentale et numérique du ruissellement de surface : effets des variations d'intensité de la pluie. Application à une parcelle de vigne en Cévennes-Vivarais.. Hydrologie. Université Joseph-Fourier - Grenoble I, 2010. Français. ⟨tel-00480779⟩

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