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Statistiques multivariées et SIG pour l'évaluation de la qualité des eaux souterraines
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ISBN10: 6206810216
ISBN13: 9786206810216
Publisher: Editions Notre Savoir
Published: Apr 30 2025
Pages: 76
Weight: 0.25
Height: 0.18 Width: 6.00 Depth: 9.00
Language: French
ISBN13: 9786206810216
Publisher: Editions Notre Savoir
Published: Apr 30 2025
Pages: 76
Weight: 0.25
Height: 0.18 Width: 6.00 Depth: 9.00
Language: French
Des techniques statistiques multivariées impliquant une analyse factorielle et une analyse hiérarchique par grappes ont été appliquées à 45 échantillons d'eau souterraine prélevés dans le district de Dhaka afin d'extraire les principaux processus contrôlant la chimie de l'eau. Les composantes principales obtenues à partir de l'analyse factorielle ont indiqué que les paramètres responsables des variations de la qualité des eaux souterraines sont principalement liés à des sources naturelles et anthropiques telles que les lixiviats générés par l'élimination des déchets industriels dans le sol, les fuites d'eaux usées provenant des établissements humains ou l'utilisation d'engrais organiques. Grâce à l'analyse hiérarchique par grappes, les échantillons d'eau ont été classés en trois groupes présentant des caractéristiques de qualité similaires. Une analyse spatiale et une interpolation de tous les éléments ont été réalisées à l'aide d'un krigeage simple, ce qui a permis de déterminer la distribution des constituants principaux (Na, Ca, Mg, Si et SO4), secondaires (K, Fe, Sr et B) et mineurs (Mn, Zn, Li, Ba et P) des eaux souterraines. L'étude de la géologie souterraine a permis de révéler que l'aquifère de Dupi Tila, situé sous Dhaka, est la principale source d'eau souterraine. Ce travail devrait servir de base à une étude sur la gestion efficace de la pollution des eaux souterraines.
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