Can shallow open-loop hydrothermal well-doublets help remediate seawater intrusion?

De Keuleneer, François; Renard, Philippe

Can shallow open-loop hydrothermal well-doublets help remediate seawater intrusion? | Est que des puits peu profonds en doublets de type boucle ouverte hydrothermale peut aider à remédier les intrusions d’eau de mer? Pueden los pozos hidrotermales someros en pares de ciclo abierto ayudar a remediar la intrusión de agua de mar? 浅层开环式双热水井能够修复海水入侵吗? Podem as parelhas de furos hidrotermais de baixa profundidade de ciclo aberto ajudar no tratamento da intrusão salina?

2015

De Keuleneer, François | Renard, Philippe

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.

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