22-27 September 2019
Trade Fairs and Congress Center (FYCMA)
Europe/Madrid timezone

Identification of groundwater potential zones by using remote sensing, GIS and géostatistical analysis in Saida region, NW Algeria

24 Sep 2019, 16:00
1h
Trade Fairs and Congress Center (FYCMA)

Trade Fairs and Congress Center (FYCMA)

Av. de José Ortega y Gasset, 201 29006 Malaga, Spain
Poster Topic 5 - Tools, methods and models to study groundwater Poster with refreshments

Speaker

Mr Cherif Kessar (Space Techniques Center-Algeria)

Description

One of the problems opposing the good management of groundwater resources, the efficiency of the implementation of boreholes and wells especially in karst aquifers where their exploitation is very difficult because of the complexity of underground hydrogeological transfers (which depend in particular on the nature of the rocks, the geological structure, the rainfall and the connectivity between faults).
In this case, the groundwater prospecting and productive drilling project requires the knowledge of a large number of geo-scientific, multidisciplinary, multisource and often multi format data.
Among the best known techniques to achieve this goal is geophysical prospecting and experimental investigation. However, new approaches based on remote sensing and geographic information systems have been used more and more recently to replace geophysical exploration or field experiments that are very cumbersome and costly. These technical difficulties remain, until now, a major obstacle for the authorities concerned in choosing the most favorable impact points for groundwater exploitation.
The study area is Saida Mountains is part of the large Macta basin which extends to the north-west of Algeria, in the last tabular foothills of the southern flank of the Tellian Atlas, formed by the Tlemcen mountains, Daïa and Saida, on the threshold of the high steppe plains. Study Zone constitutes a vast structural plateau, where the main aquifers are mainly presented by the carbonate formations largely karstified of the Bajo-Bathonian and the surface formations of Callovo. Oxfordian and Plio-Quaternary.
Digital elevation model processing provided us the lineament map and the hydrographic network. Subsequently, the statistical analysis of these two elements allowed us to study the effect of the fracturing direction on the hierarchy of the hydrographic network and the surface flow direction.
A relation was determined between the subsurface flow direction and the major fracture directions from the piezometric map analysis.
The geostatistical analysis of existing boreholes flow has allowed at the spatial scale the delimitation of high, medium and low estimated flow zones, the superposition of lineaments intersections has made it possible to determine the zones favorable for the implantation of the future drillings. The correlation between the validation map of suitable areas for the implantation of future drilling and actual drillings flow rates is approved.

Key Words: karstic aquifers, groundwater, drilling areas, RS, GIS, geostatistical analysis

Primary author

Mr Cherif Kessar (Space Techniques Center-Algeria)

Co-authors

Ms yamina Benkesmia (Space Techniques Center-Algeria) Mr Lahcen Wahib KEBIR (Space Techniques Center-Algeria)

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