NDLI: Radial Dupuit interface flow to assess the aquifer storage and recovery potential of saltwater aquifers

Content Provider	Springer Nature Link
Author	Bakker, Mark
Copyright Year	2009
Abstract	A new accurate numerical solution is presented for aquifer storage and recovery (ASR) systems in coastal aquifers; flow is approximated as radial Dupuit interface flow. The radial velocities of points on the interface are a function of time, the vertical coordinate, and the dimensionless parameter D (the discharge of the well divided by the product of the hydraulic conductivity, the square of the aquifer thickness, and the dimensionless density difference). The recovery efficiency of an ASR system (the ratio of the recovered volume of water divided by the injected volume of water) is determined by D and by the relative lengths of the injection, storage and recovery periods. Graphs are produced for the recovery efficiency as a function of parameter D for ASR operations with and without storage periods and for multiple cycles. The presented solutions and graphs are to be used as screening tools to assess the feasibility of specific injection, storage and recovery scenarios of planned ASR systems in saltwater aquifers without having to run complicated flow and transport models. When the screening tool indicates that recovery efficiencies are acceptable, the consideration of other features such as mixing and chemistry is warranted.Une nouvelle solution numérique précise est proposée pour les systèmes (ASR) de stockage et reprise en aquifère dans les aquifères côtiers : l’écoulement y est approximé par un écoulement radial de type Dupuit le long d’une interface. Les vitesses radiales des points sur l’interface sont une fonction du temps, de la coordonnée verticale et d’un paramètre sans dimension D (le débit de pompage au puits divisé par le produit de la conductivité hydraulique, du carré de l’épaisseur de l’aquifère, et de la différence de densité sans dimension). L’efficacité de la reprise d’un système ARS (le rapport volume d’eau récupéré sur volume d’eau injecté) est déterminée par D et par les durées relatives des périodes d’injection, de stockage et de reprise. L’efficacité de la récupération est représentée dans des graphiques en fonction du paramètre D pour des opérations ASR avec ou sans périodes de stockage et pour de multiples cycles. Les solutions et les graphiques présentés constituent un outil de sélection pour évaluer la faisabilité de scénarios spécifiques d’injection, de stockage et de récupération pour des projets de système ARS dans des aquifères d’eau salée sans qu’il soit nécessaire de mettre en œuvre des modèles d’écoulement et de transport compliqués. Lorsque l’outil de sélection donne des efficacités acceptables, il faut alors tenir compte des autres caractéristiques telles que mélange et chimie.Se presenta una nueva solución numérica precisa para sistema de almacenamiento en el acuífero y de recuperación en acuíferos costeros; el flujo es aproximado como un flujo radial de Dupuit de interfase. Las velocidades radiales de los puntos en la interfase son una función de tiempo, la coordenada vertical, y el parámetro adimensional D (la descarga del pozo dividida por el producto de la conductividad hidráulica, el cuadrado del espesor del acuífero y la diferencia adimensional de densidad. La eficiencia de recuperación de un sistema ASR (el cociente del volumen recuperado de agua dividido por el volumen inyectado de agua) es determinada por D y por las longitudes relativas de los períodos de inyección, almacenamiento y recuperación. Se elaboraron gráficos para la eficiencia de la recuperación en función del parámetro D para las operaciones de ASR con y sin períodos de almacenamiento y múltiples ciclos. Las soluciones presentadas y los gráficos deberán ser usadas como herramientas de filtrado para evaluar la factibilidad escenarios específicos de la inyección, almacenamiento y recuperación de sistemas ASR planificados en acuíferos de agua salada sin tener que correr complicados modelos de transporte y flujo. Cuando las herramientas de filtrado indican que las eficiencias de la recuperación son aceptables, la consideración de otros aspectos tales como mezcla y química está garantizada.将水流假设为径向裘布衣界面流, 提出了一种新的针对滨海地区含水层储存和回采(ASR)系统的精确数值解。界面处径向流速是时间、垂向坐标以及无量纲参数D (井排泄量除以渗透系数、含水层厚度的平方和无量纲密度差) 的函数。ASR系统的回采效率 (回水体积与注水体积的比) 由D和注水、储存及回采时期的相对长度决定。绘制了储存和无储存时期多循环条件下回采效率-D图。该解和图表可以作为筛选工具, 来评价具体的注水、储水及回采情景下, 规划中的咸水含水层ASR系统的可行性, 而不需运行复杂的流动和运移模型。当该筛选工具表明回采效率可行时, 对含水层其他特征如混合和水化学的考虑也即有了根据。Apresenta-se uma nova solução numérica precisa para sistemas de armazenamento e recuperação de aquíferos (aquifer storage and recovery, ASR) em aquíferos costeiros, em que se considera, como aproximação, o fluxo radial de interface Dupuit. As velocidades radiais de pontos situados na interface são função do tempo, da coordenada vertical e do parâmetro adimensional D (o caudal do furo a dividir pelo produto da condutividade hidráulica, do quadrado da espessura aquífera e do diferencial adimensional de densidade). A eficiência de recuperação de um sistema ASR (a relação entre o volume de água recuperada dividido pelo volume de água injectada) é determinada por D e pelas durações relativas dos períodos de injecção, armazenamento e recuperação. Produzem-se gráficos para a eficiência de recuperação em função do parâmetro D para operações de ASR com e sem períodos de armazenamento e para múltiplos ciclos. Pretende-se utilizar as soluções e os gráficos como ferramentas de análise para avaliar a viabilidade de cenários específicos de injecção, armazenamento e recuperação de sistemas planeados de ASR em aquíferos salinos, sem a necessidade de correr modelos complexos de escoamento e transporte. No caso da ferramenta de análise indicar eficiências de recuperação aceitáveis, justifica-se que outros aspectos, tais como mistura e química, sejam considerados.
Starting Page	107
Ending Page	115
Page Count	9
File Format	PDF
ISSN	14312174
Journal	Hydrogeology Journal
Volume Number	18
Issue Number	1
e-ISSN	14350157
Language	Portuguese
Publisher	Springer-Verlag
Publisher Date	2009-09-11
Publisher Institution	International Association of Hydrogeologists
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Aquifer storage and recovery Salt-water/fresh-water relations Coastal aquifers Dupuit interface flow Waste Water Technology Water Pollution Control Water Management Aquatic Pollution Geology Hydrogeology
Content Type	Text
Resource Type	Article
Subject	Earth and Planetary Sciences Water Science and Technology

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