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Theses

Etude du transfert d'eau et de solutés dans un sol à nappe superficielle drainée artificiellement

Abstract : The understanding of solute transport mechanisms in subsurface drained soils is essential in order to improve impacts of such systems on the quality of surface water. Experiments have been carried out in steady state conditions in the laboratory in order to control initial and boundary conditions. A soil column (1*0,15 m²) and a soil tank (1*2*0,5m3) have been used, both filled with a loamy-sand soil. The tracers used are the (H218O) and Cl‾. The first part of the thesis is dedicated to one-dimensional experiments, in order to estimate unsaturated zone properties. The second part of this PhD presents two-dimensional flow experiments in the soil tank drained with a buried pipe. Two tracers applications have been selected : a pulse input applied at the soil surface and an initially uniformly distributed tracer in soil. Only Cl‾ has been then used as tracer. The tracer propagation has been estimated in the soil by means of EC-probes (measurement of the electrical conductivity of water) and at the tank outlet (analysis of the solution). The experimental results have been confronted with a numerical code (HYDRUS-2D) using the transport parameters obtained from the one-dimensional studies. A second method, particle tracking (Lagrangian approach), has been used to estimate the transfer time of the solutes in the soil.
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Theses
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Submitted on : Thursday, May 14, 2020 - 10:52:11 PM
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  • HAL Id : tel-02584091, version 1
  • IRSTEA : PUB00016376

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T. Paris Anguela. Etude du transfert d'eau et de solutés dans un sol à nappe superficielle drainée artificiellement. Sciences de l'environnement. Doctorat en Sciences de l'eau, ENGREF Paris, 2004. Français. ⟨tel-02584091⟩

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