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77 RUE CLAUDE BERNARD, 75005 PARIS, FRANCE
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Bulletin de La Societe Geologique de France, 1996, Vol 167, Issue 2, p. 269-284
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Numerical multisource and multiscale imagery in the study of the topographic surface. Hydrogeological application in a karstic environment: Verneuil-sur-Avre (Perche, France)
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Sykioti O. , Deffontaines B. , Chorowicz J. , Obert D. , Demarsily G. , Lauverjat J. , Carvalho J. ,
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Abstract:
We propose a new method revealing geological structures and their possible relationships with water percolation. It is based on a combination of (1) numerical analysis of the topography (satellite imagery Landsat TM, HCMM, SAR-ERS1; digital elevation model and derived data: drainage network, slope map, summit level surfaces...); (2) classic geological approach (field work, geological mapping, gravimetry); and (3) hydrogeological approach (piezometric map, tracer experiments). The superimposition of these data into a geocoded data base leads to the identification and the location of morphostructures (synthetic structural map). Field data and tracer experiments confirm the validity of the results. We propose to take into consideration the present day stress regime in order to define main orientations of open fractures. In conclusion, this method provides structural information allowing a better understanding of geometry in karstic aquifers
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Keywords: aquifer, aquifers, basin, chalk, digital elevation model, digital terrain model, drainage, drainage network, environment, ers1-sar, field, fracture, fractures, fracturing, france, geological structure, geometry, hcmm, hydrogeology, identification, imagery, information, karst, karstic aquifer, landsat tm, lead, level, mapping, model, morphology, orientation, perche, regime, remote sensing, slope, stress, structure, surface, surfaces, time, times, tracer, tracers, verneuil-sur-avre, water,
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