Reference : Approach of regionalization of low flow of the Walloon Region
Scientific congresses and symposiums : Poster
Life sciences : Environmental sciences & ecology
Approach of regionalization of low flow of the Walloon Region
Gailliez, Sébastien [ > > ]
Degre, Aurore mailto [Université de Liège - ULiège > > Gembloux Agro-Bio Tech > Hydrologie et Hydraulique Agricole > >]
3ème Symposium International de la Meuse
du 22 avril 2010 au 23 avril 2010
Région Wallonne (Direction Générale Agriculture, Ressources Naturelles et Environnement)
Université de Liège (Aquapôle)
Facultés Universitaires de Namur
Commission Internationale de la Meuse
[en] The walloon part of the Meuse’s watershed represents 12283 km² and 17694 km of river. The anthropogenic pressure is important (population density is more or less 200 inhabitants/km²). In low flow period, water scarcity can touch both the water users (producer of drinking water and hydropower, tourism and pleasure activities and kayaking) and the river itself affecting the ‘good environmental state’ (context of Water Framework Directive 2000/60/CE).
The operational management of rivers during low flow periods needs a deep knowledge of this drought phenomenon including an analysis of low flow severity and its occurrence probability. It also needs the computation of low flow discharge at any point of a river based on available hydrologic variables.
The aim of this study is the low flows’ regionalization in the Walloon Region. First of all, the time series of flow data are filled in and validated. The quality is then controlled. The different tests are the determination of the minimum year requirement for a monitoring site, homogeneity tests, verification of presence or absence of summer alga and the proportion of extrapolation of the discharge rating curve
Secondly, homogeneous regions will be defined and regression equations will be build. These equations will establish the relation between low flow and physical parameters (watershed area, pedology, slope), climate ones and/or ground water ones.
The regression model will permit the computation of low flow discharge at any point of an ungauged river.
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