United Graduate School of Agricultural Sciences, Kagoshima University, Kagoshima 890-0065, Japan.
Ground Water. 2011 Mar-Apr;49(2):239-49. doi: 10.1111/j.1745-6584.2010.00719.x.
The installation of recharge wells and subsurface flow barriers are among several strategies proposed to control seawater intrusion on coastal groundwater systems. In this study, we performed laboratory-scale experiments and numerical simulations to determine the effects of the location and application of recharge wells, and of the location and penetration depth of flow barriers, on controlling seawater intrusion in unconfined coastal aquifers. We also compared the experimental results with existing analytical solutions. Our results showed that more effective saltwater repulsion is achieved when the recharge water is injected at the toe of the saltwater wedge. Point injection yields about the same repulsion compared with line injection from a screened well for the same recharge rate. Results for flow barriers showed that more effective saltwater repulsion is achieved with deeper barrier penetration and with barriers located closer to the coast. When the flow barrier is installed inland from the original toe position however, saltwater intrusion increases with deeper barrier penetration. Saltwater repulsion due to flow barrier installation was found to be linearly related to horizontal barrier location and a polynomial function of the barrier penetration depth.
在控制沿海地下水库海水入侵的几种策略中，包括安装回灌井和地下水流屏障。在这项研究中，我们进行了实验室规模的实验和数值模拟，以确定回灌井的位置和应用，以及水流屏障的位置和穿透深度对控制无压沿海含水层海水入侵的影响。我们还将实验结果与现有的分析解进行了比较。结果表明，当回灌水在咸水楔的趾部注入时，海水的排斥效果更明显。与从筛管井进行的线注相比，相同的补给率下，点注产生的排斥效果相同。对于水流屏障的结果表明，随着屏障穿透深度的增加和靠近海岸的位置，海水的排斥效果更明显。然而，当水流屏障安装在原始趾部位置的内陆时，随着屏障穿透深度的增加，海水入侵会增加。发现由于水流屏障的安装而产生的海水排斥与水平屏障位置呈线性关系，并且与屏障穿透深度呈多项式关系。
