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• W2944384105 abstract "Abstract: In the arid and semi arid areas, the misuse of water resources, the inadequate irrigation techniques (gravitational submersion) and the lack of an adequate and efficient drainage system , have had, ecologically and economically, a very negative impact. Large areas with high agricultural potential including the palm plantation of Ouargla, are now threatened by the flooding of chott areas and rising groundwater. In this context, and in order to slow the rise of the groundwater that touches the ground in some places and that increasingly threatens date palms in the Ouargla region, we have set asa main objective the desalination of drainage water and its re-use in irrigation and/or groundwater supply, after improving the existing drainage system. Resume : Les pertes en sols des terres, leur transport et sedimentation dans les infrastructures hydrauliques, hydro-agricoles, portuaires, routieres? ont pousse les decideurs a examiner de plus pres cette problematique, vu son ampleur et les consequences qu?elle engendre face aux changements climatiques attendus. Des outils d?investigation ont ete mis en oeuvre pour tenter de maitriser le phenomene, malheureusement les sols continuent a se degrader malgre une lutte antierosive intensive entreprise a l?echelle des bassins-versants des barrages en exploitation, dans une premiere phase. Le phenomene a atteint un stade parfois irreversible. Toutes les formes d?erosion y sont associees, laissant des paysages desoles. Le phenomene s?est accru et s?amplifie aussi bien dans l?espace que dans le temps, aggrave en maints endroits par le changement climatique. Des alternances d?inondations torrentielles et de secheresses prolongees sont observees. Conjuguees a une action anthropique non controlee (incendies, defrichement, surpâturage?), elles rendent le bassin d?alimentation et le reseau d?ecoulement tres vulnerables au phenomene erosif. Cette problematique complexe reste difficile a quantifier. Si a l?echelle de la parcelle ce phenomene est maitrisable, il l?est moins a l?echelle du bassin-versant. L?insuffisance ou l?absence de donnees de jaugeage et de teneurs en sediments rend plus complexes la connaissance et l?identification du phenomene. Seules des syntheses regionales et des etudes bathymetriques peuvent permettre d?identifier les zones productrices de sediments et d?elaborer des cartes ou des abaques d?aide a la decision. Tous nos travaux de recherche sont axes sur ce type d?approche et cet article propose une synthese des resultats obtenus dans le contexte algerien en zone semi-aride." @default.
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• W2944384105 date "2014-07-01" @default.
• W2944384105 modified "2023-09-23" @default.
• W2944384105 title "MEASURES AIMED AT ENSURING THE RATIONAL USE OF WATER AND SOIL RESOURCES AND THE PRESERVATION OF OASIS POTENTIAL IN THE BASIN OF OUARGLA, ALGERIA" @default.
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