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SIG and PMWIN coupled modeling in the Lower Soummam Valley (North-eastern Algeria)

Congress: 2008
Author(s): Mohamed Mesbah, Hocine Bendjoudi
F. Kessasra 1,2*, M. Mesbah 1 and H. Bendjoudi 3 1 Faculté des Sciences de la Terre, de Géographie et d’Aménagement du Territoire. Université des Sciences et de la Technologie Houari Boumediene (USTHB).P.O. Box 32 El Alia, Algiers, Algeria * E-mail :

Keyword(s): Alluvial aquifer, Groundwater flow, Numerical modelling, Lower Soummam valley, Algeria
AbstractIntroduction: The commune use of SIG database and Processing Modflow (PMWIN) simulations has been experimented in the Lower Soummam Valley. This efficient tool consists to elaborate spatial distribution supports of the hydrogeological data by application of the interpolation process in order to parameterize the hydrodynamic modelling which coupled with the numerical modelling for simulation of the groundwater flow. It consists to build a hydrodynamic model by including the pumping scenarios which permit to control head levels, impact of the pumping on the aquifer in short-term and medium-term and to evaluate the hydraulic connection between river and aquifer. Objective: To achieve an approximation of the real situation of the alluvial aquifer of Lower Soummam by application of the mathematical modelling and especially to develop a sustainable water resource management in the region. Methods: The model area was discretized into 300 finite difference cells in the shape of square of 400 m of side and 100 square meshes had been divided into 200 rectangular meshes. It appears important, first, to make a simulation of these processes under steady-state condition in order to defining the hydrogeological functioning. Then under transient- state condition with successive simulations through implementation of an exploitation device destined for urban water supply, irrigation and industrial purposes. Results and conclusion: The control wells present seasonal piezometric surface variations under two hydrological modes (low water and high water periods). In addition, thirteen production wells were drilled in the mouth part of the river when the pumping rate reaches 82 l/s. Several preventive directives could be used to control the land-use, in first stage, the salt content of groundwater is very higher, resulting from the sea-water intrusion, it is reasonable to decrease the water extraction and stop the implantation of the hydraulic structures. In second stage, it is also possible to intensify the system exploitation for an equitable compensation with the pumping restrictions proposed in the north part or an enhancement of the pumped rate.
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