Évaluation de la performance des drains et des matériaux filtrants à ralentir le colmatage et l'ensablement en sol sableux et ferreux

Authors: Blais-Gagnon, Arianne
Advisor: Lagacé, Robert
Abstract: In Quebec, drains installed in sandy loam soils are susceptible to clogging by silt and/or by iron ochre. In the past, drains with slot widths smaller than 2 mm were used with a woven filter of 110 microns or knitted filter of 450 microns. Recently, drains with slot widths larger than 2 mm and a filter of 250 microns were introduced on the market but have never been tested. The project aimed to determine the speed at which silting and iron clogging will happen for different combinations of drains (slot widths 1,8 mm and 3 mm) and filters (110 μm, 250 μm et 450 μm) in a Becancour’s sandy soil. An experimental randomized complete block (3) design was used. The flow rates were measured at the outlet of each experimental plot and the heights of water table were measured with a bubbler in piezometers. The monitoring of physicochemical parameters (pH, redox potential and Fe2+ content) was performed in ground water and water from the drain outlet. The drains excavated 13 months after their installation only show traces of sediments and of iron ochre. Concentrations in Fe2+ are significantly lower in the water from the outlet drains than water from the ground water table. Iron clogging process seems to begin and its impacts are not measurable in terms of flow rates at the drain outlets.
Document Type: Mémoire de maîtrise
Issue Date: 2016
Open Access Date: 24 April 2018
Permalink: http://hdl.handle.net/20.500.11794/27123
Grantor: Université Laval
Collection:Thèses et mémoires

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