Étude des recouvrements avec effet de barrière capillaire pour minimiser les infiltrations d'eau dans les sites d'enfouissement de matières résiduelles
type: CreativeWork
description: This thesis concerns the performance of an alternative low hydraulic conductivity cover for landfills, i.e. covers with capillary barrier effect (CCBE). The use of recycled materials, such as DBP, as parts of such covers has the advantage of reducing the quantity of waste to be disposed of (DBP used to be landfilled as waste), while offering an efficient control to the infiltration of water into the landfill, thereby reducing the amount of leachate produced. Given its water retention characteristics, DBP can also help to control biogas emissions. An experimental cell at Saint-Tite-des-Caps landfill, Québec, was designed to be a low permeability cover and to increase the effectiveness of biogas collection. The design procedure of the cover is based on the capillary barrier principle. As a consequence, the water retention curve (WRC) and the hydraulic conductivity functions (HCF) of materials are fundamental. The design procedure included optimization of the thicknesses of the several layers composing the barrier and determination of the transfer length (TL) using an appropriate model. The latter had to be shorter than the total length of the cell (30 m), in order to allow for verification of the design hypothesis. The objective of this project was to evaluate the performance of the CCBE, infiltration was measured by means of lysimeters. The quantities of water recovered in these lysimeters were frequently obtained. In addition, the temporal evolutions of the matric suction and the volumetric water content of the various layers were monitored using dataloggers. Water content data made it possible to determine both the infiltration rate through the DBP layer, which eventually reached the capillary barrier, and the hydraulic conductivity of the material. The latter varies between 7,0 × 10 -9 m/s and 5,0 × 10-11 m/s, in the field. Another important result of this study was the determination transfer length, that is to say the length beyond which water infiltrates in the …
abstract: This thesis concerns the performance of an alternative low hydraulic conductivity cover for landfills, i.e. covers with capillary barrier effect (CCBE). The use of recycled materials, such as DBP, as parts of such covers has the advantage of reducing the quantity of waste to be disposed of (DBP used to be landfilled as waste), while offering an efficient control to the infiltration of water into the landfill, thereby reducing the amount of leachate produced. Given its water retention characteristics, DBP can also help to control biogas emissions. An experimental cell at Saint-Tite-des-Caps landfill, Québec, was designed to be a low permeability cover and to increase the effectiveness of biogas collection. The design procedure of the cover is based on the capillary barrier principle. As a consequence, the water retention curve (WRC) and the hydraulic conductivity functions (HCF) of materials are fundamental. The design procedure included optimization of the thicknesses of the several layers composing the barrier and determination of the transfer length (TL) using an appropriate model. The latter had to be shorter than the total length of the cell (30 m), in order to allow for verification of the design hypothesis. The objective of this project was to evaluate the performance of the CCBE, infiltration was measured by means of lysimeters. The quantities of water recovered in these lysimeters were frequently obtained. In addition, the temporal evolutions of the matric suction and the volumetric water content of the various layers were monitored using dataloggers. Water content data made it possible to determine both the infiltration rate through the DBP layer, which eventually reached the capillary barrier, and the hydraulic conductivity of the material. The latter varies between 7,0 × 10 -9 m/s and 5,0 × 10-11 m/s, in the field. Another important result of this study was the determination transfer length, that is to say the length beyond which water infiltrates in the …
author: El Ghabi, Baligh
language: fr
date published: 2007
date modified: 2026-07-27T21:07:51Z
provider: Université de Sherbrooke
publisher: Networked Digital Library of Theses and Dissertations
type: WebPage
source organization: Université de Sherbrooke

PropertyValue
property ID: Handle
value: https://hdl.handle.net/11143/1380