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<dc:title xml:lang="en">Modeling seawater intrusion under uncertainties : application to the coastal aquifer of Kuwait City</dc:title>
<dcterms:alternative xml:lang="fr">Modélisation de l’intrusion saline dans les nappes costières sous incertitudes : application a l’aquifère de la ville de Koweït</dcterms:alternative>
<dc:subject xml:lang="fr">Les régions côtières</dc:subject>
<dc:subject xml:lang="fr">Eau souterraine</dc:subject>
<dc:subject xml:lang="fr">L’intrusion saline</dc:subject>
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<dc:subject xml:lang="en">Seawater intrusion</dc:subject>
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<tef:elementdEntree autoriteExterne="033460892" autoriteSource="Sudoc">Eau salée -- Empiètement</tef:elementdEntree>
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<dcterms:abstract xml:lang="fr">L’intrusion d’eau salée constitue une menace majeure pour les aquifères côtiers en raison du pompage excessif des eaux souterraines, qui perturbe l’équilibre naturel entre l’eau douce et l’eau salée et entraîne la contamination des réserves d’eau potable. Les modèles d’écoulement à densité variable sont utilisés pour simuler ce phénomène, mais leurs prédictions restent incertaines car des paramètres essentiels comme la perméabilité et les taux de pompage sont difficiles à mesurer avec précision. Cette thèse propose une stratégie efficace d’analyse d’incertitude à l’échelle réelle, combinant présélection des paramètres et analyse de sensibilité globale basée sur l’expansion en chaos polynomial parcimonieuse et les indices de Sobol. Les résultats montrent qu’une incertitude de 10 % sur les paramètres les plus influents peut entraîner plus de 50 % de variation dans les prévisions de salinité, soulignant l’importance d’une gestion des ressources en eau fondée sur le risque.</dcterms:abstract>
<dcterms:abstract xml:lang="en">Seawater intrusion poses a serious threat to coastal aquifers due to excessive groundwater pumping, which disrupts the natural balance between freshwater and seawater and leads to contamination of drinking water supplies. Variable-density flow models are widely used to simulate and manage this complex process, yet their predictions remain uncertain because key parameters such as permeability, recharge, and pumping rates are difficult to measure accurately. In data-scarce regions like Kuwait, limited monitoring further increases uncertainty. This thesis proposes an efficient field-scale uncertainty analysis strategy that combines parameter pre-screening and global sensitivity analysis using sparse Polynomial Chaos Expansion and Sobol indices. A surrogate model is developed to perform fast stochastic simulations while accounting for time-varying pumping conditions. Results show that even a 10% uncertainty in the most influential parameters can lead to more than 50% variation in salinity predictions, highlighting the importance of risk-based groundwater management.</dcterms:abstract>
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