Abstract
Recharge through injection wells is a well-established technique to remediate and protect coastal aquifers from saltwater intrusion. In this study, it is shown that hydrothermal doublet installations can also be used to protect coastal aquifers while producing heat or cold for air conditioning. Such a method could be extremely valuable for situations where there is both a need for freshwater and energy production in coastal regions. The efficiency of the proposed approach is tested using Strack’s analytical solution on a wide range of scenarios where the number of injection and pumping wells vary as well as the distance between these wells and the coast. The efficiency is evaluated through four control parameters: the relative freshwater volume, the maximum penetration distance of the saltwater toe, the thermal breakthrough time, and the percentage of injected water recycled. The analysis of these parameters computed for 343 scenarios confirms the efficiency of the method. Those results are extremely encouraging even if they still need to be confirmed through field experiments.
Résumé
Recharger par des puits d’injection est une technique bien établie pour remédier et protéger les aquifères côtiers d’intrusions d’eau salée. Dans cette étude, il est démontré que les installations de doublets hydrothermaux peuvent également être utilisées pour protéger les aquifères côtiers en produisant de la chaleur ou du froid pour la climatisation. Une telle méthode pourrait être extrêmement utile pour les situations où il y a à la fois un besoin en eau douce et en production d’énergie dans les régions côtières. L’efficacité de l’approche proposée est testée en utilisant la solution analytique de Strack sur un large éventail de scénarios où le nombre d’injection et de puits de pompage varie ainsi que la distance entre ces puits et la côte. L’efficacité est évaluée à l’aide de quatre paramètres de contrôle: le volume relatif de l’eau douce, la distance maximale de pénétration du biseau salé, le temps de rupture thermique, et le pourcentage d’eau injectée recyclée. L’analyse de ces paramètres calculés pour 343 scénarios confirme l’efficacité de la méthode. Ces résultats sont extrêmement encourageants, même si ils doivent encore être confirmés par des expériences sur le terrain.
Resumen
La recarga a través de pozos de inyección es un técnica bien establecida para remediar y proteger acuíferos costeros de la intrusión de agua salada. En este estudio, se muestra que las instalaciones hidrotermales en pares pueden también ser usadas para proteger acuíferos costeros mientras producen calor o frío para aire acondicionado. Tal método podría ser extremadamente valioso para situaciones donde hay una necesidad tanto de agua dulce como de producción de energía en regiones costeras. Se probó la eficiencia del enfoque propuesto usando la solución analítica de Strack en un amplio rango de escenarios donde el número de pozos de bombeo e inyección varía así como la distancia entre estos pozos y la costa. Se evalúa la eficiencia a través de cuatro parámetros de control: el volumen relativo de agua dulce, la máxima distancia de penetración de la punta de agua salada, el tiempo de ruptura térmica, y el porcentaje de agua inyectada reciclada. El análisis de estos parámetros computados para 343 escenarios confirma la eficiencia del método. Estos resultados son extremadamente alentadores aún cuando ellos todavía necesitan ser confirmados a través de experimentos de campo.
摘要
通过注水井补给是一项修复和保护沿海含水层免受海水入侵的技术。在本研究中,展示了双热水井装置在空调制冷或制暖过程中也可用来保护沿海含水层。这种方法对于沿海地区需要淡水和能源生产特别有用。利用斯特拉克解析法根据多种方案在注水井和抽水井数量不同及井和海岸距离不同的基础上对这种方法的有效性进行了测验。通过四个控制参数评估了有效性:这四个参数是相对淡水量、海水入侵前端最大穿透距离、热量突破时间和循环注入水的百分比。根据343种方案计算的这些参数分析结果确认了本方法的有效性。尽管还需要通过室外实验确认,但这些结果非常令人鼓舞。
Resumo
A recarga mediante furos de injeção é uma técnica bem estabelecida para tratar e proteger os aquíferos costeiros da intrusão salina. Neste estudo mostra-se que se podem usar parelhas de instalações hidrotermais para proteger os aquíferos costeiros, ao mesmo tempo que produzem frio ou calor para ar condicionado. Este método poderia ser muito valioso em situações em que exista uma necessidade de produção de água doce e, ao mesmo tempo, de energia, em regiões costeiras. A eficiência da abordagem proposta é testada utilizando a solução analítica de Strack num largo espetro de cenários onde o número de furos de injeção e de extração varia, assim como a distância entre estes furos e a costa. A eficiência é avaliada utilizando quatro parâmetros de controlo: o volume relativo de água doce, a distância de penetração máxima da base da água salgada, o tempo de rutura térmico e a percentagem de água injetada que é reciclada. A análise destes parâmetros, calculados para 343 cenários, confirma a eficiência do método. Estes resultados são extremamente encorajadores, mesmo que ainda tenham que ser confirmados mediante experiências de campo.
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Acknowledgements
The authors are thankful to Pierre Perrochet, Jaouher Kerrou, and Vincent Badoux for all their help, discussions and comments throughout this study. The authors are thankful to Paul Taylor for reviewing the language.
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De Keuleneer, F., Renard, P. Can shallow open-loop hydrothermal well-doublets help remediate seawater intrusion?. Hydrogeol J 23, 619–629 (2015). https://doi.org/10.1007/s10040-015-1230-9
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DOI: https://doi.org/10.1007/s10040-015-1230-9