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Bouzelboudjen, Mahmoud

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Bouzelboudjen, Mahmoud
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https://libra.unine.ch/handle/123456789/1079

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  • Publication
    Accès libre
    TracES/View - Traçage des Eaux Souterraines : Application SIG en milieu karstique jurassien (Suisse)
    Bouzelboudjen, Mahmoud 
    ;
    Ornstein, Pascal
    ;
    Kimmeier, Francesco
    L'usage de traceurs artificiels est une méthode spécialement bien établie pour étudier les aquifères karstiques. Dans ce contexte, les traçages (avec des traceurs artificiels et biologiques) permettent de déterminer les limites des bassins versants, d'identifier la relation entre une perte et une résurgence, d'évaluer les phénomènes de diffluence, de déterminer le temps de transit, etc. Plus récemment les méthodes de traçage sont utilisées dans les études quantitatives de transport de polluant. Les essais de traçage prenant du temps et étant coûteux, une application (TracES/View) combinant les Systèmes d'Informations Géographiques (SIG) ArcInfo et ArcView, les deux couplés avec une base de données MS Access a été développée afin de planifier de façon efficace la réalisation de nouveaux essais de traçage. Une application utilisant ArcView, développée avec le language de programmation orienté-objets Avenue permet à des non-spécialistes en SIG d'accéder facilement aux éléments de la base de données des essais de traçage d'une manière graphique intuitive et interactive à l'écran. Utilisée conjointement avec d'autres cartes thématiques (la topographie, les surfaces structurales des formations géologiques, la délimitation des aquifères, les perméabilités, l'utilisation du sol, etc.), elle peut fournir un outil puissant d'aide à la décision pour la gestion des ressources en eaux souterraines., The use of artificial tracers is a specially well-established method to investigate karstic aquifers. In this case, tracing (artificial and biological tracers) enables to delimit watercatchment boundaries, to identify relation between a sinkhole and an outlet, to assess diffluent phenomena, transit time, etc. More recently tracer methods have been used in pollution transport studies. Tracer studies being time-consuming and expensive, an application (TracES/View) combining ArcInfo and ArcView Geographical Information Systems (GIS), both coupled with MSAccess database has been developped to provide an efficient way to plan the implementation and the planning of new tracer tests. An ArcView application developped with Avenue object-oriented scripting language allows GIS non-specialists to easily access data from tracer tests database in an interactive and intuitive way. Used in conjunction with other thematic maps (hydraulic conductivity, landuse, groundwater resources, and so on), it can provide a powerful decision-support tool for groundwater resources management.
  • Publication
    Accès libre
    Olocenic alluvial aquifer of the River Cornia coastal plain (southern Tuscany, Italy): database design for groundwater management
    Barazzuoli, P
    ;
    Bouzelboudjen, Mahmoud 
    ;
    Cucini, M. S
    ;
    Király, László. Centre d'Hydrogéologie, Université de Neuchâtel, Switzerland
    ;
    Menicori, P
    ;
    Salleolini M
    Hydrogeological research is in progress, utilizing GIS methods, with the principal aim of modelling the Olocenic alluvial aquifer of the River Cornia coastal plain (southern Tuscany, Italy), which has been exploited for drinking water, irrigation, and industrial uses. A consequence of exploitation has been the appearance of wide seawater intrusion. The alluvial aquifer has recently been subjected to new well fields for the supply of drinking water, with an increase of total average discharge of about 4×106 m3/year. This paper presents results obtained from updating and integrating basic knowledge and structuring the database. The hydrogeological study allowed the recognition of the extension of areas that are characterized by a hydraulic head under the sea level, the progressive salinization of the aquifer, and the increase of water deficit in the aquifer which is produced by a progressive extraction of water superior to the natural recharge. In addition, benefits and disadvantages resulting from the location of new well fields in a hydrogeologically favourable zone, and the boundary conditions for much of the area studied have been defined. The GIS was used as support for making and updating the tabular and spatial database with the aim of integrating the local and regional hydrogeological knowledge. This study will permit the realization of a numerical simulation of the groundwater flow of the aquifer aimed at correcting the management of water resources, by means of the GIS-modelling integration.
  • Publication
    Accès libre
    GIS Vector and Raster Database, Advanced Geostatistics and 3-D Groundwater Flow Modelling in Strongly Heterogeneous Geologic Media: An Integrated Approach
    Bouzelboudjen, Mahmoud 
    ;
    Kimmeier, Francesco
    The aquifers of the Rhône valley in Switzerland are of great economic importance. The groundwaters are exploitable at slight costs. However, their situation make them specially vulnerable. The aim of this paper is to give a brief outlook on the methodology to build a very powerful three dimensional hydrogeological model. This model will be used by the community of Valais as a tool for the management and protection of the groundwater. ArcInfo [9] and ArcView [10] are employed as geographic information system and Oracle [15] and Access [1] as database management system on workstation and personal computer. The advanced geostatistical treatment of spatial basic data is carried out through several techniques (Surfer [17], Isatis [11] and ArcInfo). The 3-D hydrogeological mathematical model are based on the finite element method (Feflow [7] and FEN derived from FEM 301 [14]).
  • Publication
    Accès libre
    Contribution of a GIS in the spatial modeling of the hydrologic balance of Allondon watershed (France, Switzerland)
    Ebener, Steeve
    ;
    Wildi, Walter
    ;
    Bouzelboudjen, Mahmoud 
    ;
    Jaquet, J-M
    ;
    Fortin, J.-P
    This paper discusses the development of an approach allowing the spatial distribution of the hydrologic balance at the watershed scale using Geographical Information Systems (GIS). Methods were developed in order to obtain the intensity distribution of precipitation, interception, infiltration, runoff and evapotranspiration. These methods have been applied on the Allondon watershed (France, Switzerland). At the scale of this watershed (142 km2), the annual input of rain reaches 190*106m3, the snow melt contributing to 4*106m3 to this amount. Vegetation intercepts 26*106m3 from which 8*106m3 aren’t evapotranspired but reaching the ground. On the ground surface, 176*106m3 are divided into runoff for 92*106m3 and infiltration for 84*106m3. The evapotranspiration generates a return of 61*106m3 in the atmosphere. This volume of water comes from interception and from the stock observed in the soils.
  • Publication
    Accès libre
    Three-dimensional GIS cartography applied to the study of the spatial variation of soil horizons in a Swiss floodplain
    Santos Mendonça, M.L
    ;
    Guenat, Claire
    ;
    Bouzelboudjen, Mahmoud 
    ;
    Golay, Frederic
    In this study, we propose to establish a framework for the study of the spatial variability of the soils found in the floodplain of the Sarine River and for the visualisation of soil distribution patterns in two- and three-dimensions (2-D, 3-D). This environment is characterised by a large lateral and vertical spatial variability of soils that corresponds to the temporal and spatial variations of the fluvial dynamics of the Sarine. The study was carried out using existing Geographical Information System (GIS) functions combined with applications specific to soil cartography. This particular GIS cartography is based on the notion of the soil horizon instead of that of the soil diagnostic profile. A Global Positioning System (GPS) survey was carried out in order to construct a local Digital Elevation Model (DEM) and to ascertain the spatial coordinates for each of the 181 soil obsevation locations. All data were stored in a GIS database, and both landform modeling and soil cartography was undertaken. GIS, ARC/INFO, and Vertical Mapper for MapInfo were adequate for our linear triangulation interpolation, for contour processing and for the creation of cross-sections as well as the corresponding vertical profiles. These vertical profiles served to illustrate the superposition of soil horizons along any line across the sampled area. A 3-D representation of soil was obtained using the quadratic finite-element method, which is generally employed in geological studies and which we adapted especially for the representation of soil horizons. 3-D cartography of this type allows the spatial pattern of a given horizon — including the variation of its thickness, the superimposition of the different soil horizons, the total soil depth, and the number of horizons at any given location — to be followed through space. Our approach, furthermore, facilitates the perception of soil horizons and their juxtarelationships as 3-D objects, and permits the visualisation of the relationships that exist between any given horizon (or sequence of horizons) and the surface topography. In thus enabling the realistic representation and easy visualisation of the spatial distribution and variability of soils in the landscape, our methodological approach provides a powerful instrument for soil scientists, and a useful decision-support tool for ecosystem management.