Informations et ressources scientifiques
sur le développement des zones arides et semi-arides

Accueil du site → Master → Suède → An experimental study of pollutant transport and erosion susceptibility in Tunisia : a study with rainfall simulation and dye in the M’Richet el Anze catchment

Lund University (1997)

An experimental study of pollutant transport and erosion susceptibility in Tunisia : a study with rainfall simulation and dye in the M’Richet el Anze catchment

Palmquist O., Tullberg O.

Titre : An experimental study of pollutant transport and erosion susceptibility in Tunisia : a study with rainfall simulation and dye in the M’Richet el Anze catchment

Auteur : Palmquist O., Tullberg O.

Université de soutenance : Lund University

Grade : Master of Science Thesis (1997)

Résumé
The purpose ofthe study was to investigate the effects ofheavy rain storms on the clayey soils in the watershed of M’Richet el Anze, Tunisia. The study included an investigation and visualization of the preferential flowpaths, different ways to determine the relationship between runoff and infiltration, an approximate measurement of erosion effects, and a discussion according to pollutant transport through the unsaturated zone to the groundwater. Six rainfall simulations were carried out. The rainfall water was colored with dye, Brilliant Blue (4 g/l). Afterwards, the plots were excavated in 2.5 cm thick vertical slices. Every slice was photographed. The photos were scanned, digitized, and plotted in three dimensions. Soil samples for determination of soil water contents were collected before rainfall, immediately after rainfall, and just before excavation. Sediment samples were collected to investigate erosion effects. Infiltration was measured and calculated using three different methods. We found that preferential flow existed and that a great deal of the infiltrated water passed through root-channels, cracks, and macro-pores. At site 1 the infiltration had a maximum depth of 1.5 m, which implies that pollutants may reach directly to the groundwater after heavy rainfall. At the other two sites the maximum penetration was 73 cm (site 2) and 1.35 m (site 3).

Mots Clés : ECOULEMENT ; INFILTRATION ; SIMULATION DE PLUIE ; EROSION HYDRIQUE ; POLLUTION DES EAUX CONTINENTALES ; EAU SOUTERRAINE ; TRANSPORT ; ETUDE EXPERIMENTALE ; METHODOLOGIE ; POLLUANT ; TRACEUR ; TUNISIE ; M’RICHET EL ANZE BASSIN VERSANT

Présentation (IRD)

Version intégrale

Page publiée le 7 juillet 2014, mise à jour le 3 août 2018