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Mécanismes de génèse du ruissellement sur sol agricole drainé sensible à la battance. Etudes expériementales et modélisation

Abstract : This study aims at describing and organizing into a hierarchy the processes leading to surface runoff on artificially subsurface drained area, by considering not only the perched water table fluctuations, but also the possible soil surface sealing. Three complementary research issues have been developed. First, the evolution of the tilled layer structure during rainfall in the presence of a shallow water table was observed using laboratory rainfall simulation. Bulk density profiles measured by X-ray radiography show that the increase of bulk density due to sealing and slumping are more significant in the wettest conditions. The proposed bulk density evolution model correctly reproduces this effect. Second, seal hydraulic properties were determined from a model based on bulk density profiles using other simulated rainfall experiments. The estimation of model parameters by inverse method led to an accurate simulation of the measured flows and water pressures, and conformed to the measured bulk density profiles. Hydraulic conductivity greatly decreases at the soil surface due to sealing process. The third issue was based on a drained field investigation in Mélarchez watershed (Seine et Marne) associated to flow modelling (Hydrus 2D). Data recorded in winter 2003-2004 show that drainage limits surface runoff amount. Saturation excess runoff is the most frequent observed process, even if soil sealing, especially due to saturation excess surface runoff, increases runoff amount. Other rainfall conditions were tested using Hydrus 2D. The condition of water table reaching soil surface was particularly analysed in terms of infiltration-runoff flows and return time of the corresponding rainfalls.
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https://hal.inrae.fr/tel-02587928
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Submitted on : Friday, May 15, 2020 - 12:22:30 PM
Last modification on : Monday, January 3, 2022 - 1:55:16 PM

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  • HAL Id : tel-02587928, version 1
  • IRSTEA : PUB00019796

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B. Augeard. Mécanismes de génèse du ruissellement sur sol agricole drainé sensible à la battance. Etudes expériementales et modélisation. Sciences de l'environnement. Doctorat Sciences de l'eau ENGREF Paris, 2006. Français. ⟨tel-02587928⟩

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