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

Content Provider	Springer Nature Link
Author	Karatzas, George P. Dokou, Zoi
Copyright Year	2015
Abstract	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.L’intrusion d’eau salée est un phénomène courant dans les aquifères côtiers qui peuvent affecter la qualité des eaux destinées à des fins de consommation d’eau potable et d’irrigation. Afin de fournir des options de gestion durable de l’aquifère côtier de Malia, situé en Crête, île grecque, une méthodologie d’optimisation multi-objectifs à pondération est utilisée. La méthodologie implique l’utilisation de l’algorithme d’optimisation par essaim de particules combiné à la modélisation des écoulements d’eaux souterraines. L’hypothèse d’une interface nette combinée avec l’équation de Ghyben-Herzberg est utilisée pour estimer la localisation du front d’intrusion d’eau salée. Les résultats de modélisation prédictive montrent que, pour les stratégies de pompages actuels (surexploitation), le front d’intrusion d’eau salée va continuer à progresser vers l’intérieur des terres, ce qui pose une grave menace pour la qualité des eaux souterraines. L’objectif de gestion est de maximiser les débits de pompages des eaux souterraines dans les puits existants tout en inhibant le front d’intrusion d’eau salée dans les secteurs les plus proches de la zone côtière. Ceci est réalisé en imposant des valeurs minimales de charge hydraulique dans des localisations présélectionnées pour l’observation. Afin de contrôler l’intrusion d’eau salée, un grand nombre de puits de pompage doit être désactivé et d’autres sources d’eau doivent être considérées.La intrusión de agua salada es un fenómeno común en los acuíferos costeros que pueden afectar a la calidad de las aguas destinadas para fines potables y de riego. Con el objeto de proporcionar opciones de gestión sostenible en el acuífero costero de Malia, situado en la isla griega de Creta, se emplea una metodología de optimización multi-objetivo ponderado. La metodología consiste en el uso de un algoritmo de optimización por nubes de partículas combinado con el modelado de las aguas subterráneas. Se utiliza una aproximación de la interfaz marcada combinada con la ecuación Ghyben-Herztberg para estimar la ubicación frente de la intrusión de agua salada. Los resultados de los modelos de predicción indican que bajo las actuales estrategias de bombeo (sobreexplotación), el frente de la intrusión del agua salada continuará moviéndose hacia el interior, lo que representa una seria amenaza para la calidad del agua subterránea. El objetivo de gestión es maximizar las tasas de extracción de agua subterránea en los pozos de bombeo existentes al tiempo que se inhiba el avance de la parte frontal de la intrusión de agua salada en lugares cercanos a la zona costera. Esto se logra al requerir un valor mínimo de la carga hidráulica en los lugares de observación pre-seleccionados. Con el fin de controlar la intrusión de agua salada deben ser desactivados un gran número de pozos de bombeo y deben ser consideradas fuentes alternativas de agua.海水入侵是沿海含水层一个常见的现象,可影响用于饮用和灌溉的水的水质。为了给位于希腊克里特岛的玛利亚沿海含水层提供可持续的管理选择,采用了加权多目标优化方法。该方法使用了粒子群优化算法和地下水模拟。利用明显界面近似法和Ghyben-Herztberg方程式估算了海水入侵前锋位置。预测模拟结果显示,在目前抽水状态(超采)下,海水入侵前锋将继续向内陆移动,对地下水质造成了严重威胁。管理目标就是在保持现有抽水井抽水量最大化状态下,抑制沿海带附近的海水入侵前锋。通过获取预先选择的观测点的水头值,这个目标可以达到。为了控制海水入侵,必须停止使用大量的抽水井,并且需要考虑替代水源。Intrusão de água salina é um fenômeno comum em aquíferos costeiros que podem afetar a qualidade da água utilizável em propósitos de irrigação e consumo. Para proporcionar opções sustentáveis de gerenciamento para o aquífero costeiro de Mália, localizado na ilha Grega de Creta, uma metodologia multi-objetiva ponderada foi empregada. A metodologia envolve a utilização do algoritmo da otimização por enxame de partículas combinado com a modelagem das águas subterrâneas. A aproximação da interface abrupta combinada com a equação de Ghyben-Herztberg foi utilizada para estimar a localização da frente de intrusão de água salina. Os resultados preditos da modelagem demonstram que sob as estratégias de bombeamento atuais (sobre-explotação), a frente de intrusão de água salina continuará a mover-se terra a dentro, tornando-se uma séria ameaça à qualidade das águas subterrâneas. O objetivo do gerenciamento é maximizar as taxas de retirada de água subterrânea nos poços de bombeamento existentes enquanto inibe a frente de intrusão de água salina próximas as zonas costeiras. Isso é obtido através da medição do valor de carga hidráulica mínimo em locais de observação pré-selecionados. Para controlar a intrusão de água salina, um grande número de poços de bombeamento deve ser desativado e fontes alternativas de água precisam ser consideradas.
Starting Page	1181
Ending Page	1194
Page Count	14
File Format	PDF
ISSN	14312174
Journal	Hydrogeology Journal
Volume Number	23
Issue Number	6
e-ISSN	14350157
Language	Portuguese
Publisher	Springer Berlin Heidelberg
Publisher Date	2015-07-15
Publisher Institution	International Association of Hydrogeologists
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Groundwater management Coastal aquifers Saltwater intrusion Optimization Greece Hydrogeology Hydrology/Water Resources Geology Water Quality/Water Pollution Geophysics/Geodesy Waste Water Technology Water Pollution Control Water Management Aquatic Pollution
Content Type	Text
Resource Type	Article
Subject	Earth and Planetary Sciences Water Science and Technology

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