Optimal management of saltwater intrusion in the coastal aquifer of Malia, Crete (Greece), using particle swarm optimization

Karatzas, George P.; Dokou, Zoi

Optimal management of saltwater intrusion in the coastal aquifer of Malia, Crete (Greece), using particle swarm optimization | Gestion optimale des intrusions d’eau salée dans l’aquifère côtier de Malia, Crète (Grèce), en utilisant la méthode d’optimisation par essaim de particules Un manejo óptimo de la intrusión salina en el acuífero costero de Malia, Creta (Grecia), mediante la optimización de nubes de partículas 利用粒子群优化对(希腊)克里特岛玛利亚沿海含水层海水入侵进行最优化管理 Gerenciamento efetivo de intrusão de água salina no Aquífero costeiro de Mália, Creta (Grécia), utilizando optimização por enxame de partículas

2015

Karatzas, George P. | Dokou, Zoi

Saltwater intrusion is a common phenomenon in coastal aquifers that can affect the quality of water intended for drinking and irrigation purposes. In order to provide sustainable management options for the coastal aquifer of Malia, located on the Greek island of Crete, a weighted multi-objective optimization methodology is employed. The methodology involves use of the particle swarm optimization algorithm combined with groundwater modelling. The sharp-interface approximation combined with the Ghyben-Herztberg equation is used to estimate the saltwater-intrusion front location. The prediction modelling results show that under the current pumping strategies (over-exploitation), the saltwater-intrusion front will continue to move inland, posing a serious threat to the groundwater quality. The management goal is to maximize groundwater withdrawal rates in the existing pumping wells while inhibiting the saltwater-intrusion front at locations closer to the coastal zone. This is achieved by requiring a minimum hydraulic-head value at pre-selected observation locations. In order to control the saltwater intrusion, a large number of pumping wells must be deactivated and alternative sources of water need to be considered.

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