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首页> 外文期刊>Transport in Porous Media >Using Compressed Air Injection to Control Seawater Intrusion in a Confined Coastal Aquifer
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Using Compressed Air Injection to Control Seawater Intrusion in a Confined Coastal Aquifer

机译：使用压缩空气控制密闭海岸含水层中的海水入侵

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Seawater intrusion into groundwater is an important problem in many coastal regions. Freshwater injection has been widely used to avoid seawater contaminating freshwater systems, but is not an attractive solution where freshwater is limited. We investigated the effects of injecting compressed air on seawater movement in a confined coastal aquifer using a numerical simulation. We used TOUGH2/EOS7 software to analyze the effects of injecting compressed air in preventing seawater intruding into a hypothetical confined coastal aquifer (Henry's problem), simulating steady-state initial conditions and comparing the results with the literature sources. We then performed a transient-state numerical simulation to quantify the seawater intrusion control efficiency achieved by injecting air. The results showed that injecting compressed air can mitigate seawater intrusion: Saltwater was ejected from the aquifer and the seawater circulation disappeared. The injected air flowed upward and spread laterally near the top of the aquifer because of the groundwater and air densities. Injecting air significantly increased the groundwater and gas pressures near the air injection zone and at the top of the aquifer. The air injection rate increased rapidly, then increased gradually. Freshwater injection was also simulated using settings similar to those used for air injection, and this showed that seawater intrusion is prevented more efficiently by freshwater injection than air injection. However, freshwater resources are valuable, whereas air is readily available, so injecting air to mitigate seawater intrusion has great potential. The modeling approach that we used will be used as a foundation for future work.
机译：海水入侵地下水是许多沿海地区的重要问题。淡水注入已被广泛用于避免海水污染淡水系统，但是在淡水有限的情况下，这并不是一种有吸引力的解决方案。我们使用数值模拟研究了压缩空气对密闭海岸含水层中海水运动的影响。我们使用TOUGH2 / EOS7软件分析了注入压缩空气在防止海水侵入假设的受限沿海含水层（亨利问题）中的作用，模拟了稳态初始条件，并将结果与​​文献资料进行了比较。然后，我们进行了瞬态数值模拟，以量化通过注入空气实现的海水入侵控制效率。结果表明，注入压缩空气可以减轻海水的入侵：盐水从含水层中喷出，海水循环消失了。由于地下水和空气的密度，注入的空气向上流动并在含水层顶部附近横向扩散。注入空气会显着增加注入区域附近和含水层顶部的地下水和气压。空气注入速率迅速增加，然后逐渐增加。还使用与空气注入相似的设置模拟了淡水注入，这表明与空气注入相比，通过淡水注入可以更有效地防止海水入侵。然而，淡水资源是宝贵的，而空气却很容易获得，因此注入空气以减轻海水入侵具有很大的潜力。我们使用的建模方法将用作未来工作的基础。

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