Langebaan Road and Elandsfontein aquifer found in the West Coast of South Africa was used as the case study. Previous studies on groundwater excluded focusing on ideal methods used to determine aquifer connectivity which is the focus on the current study. Aquifer connectivity in this case study is vital as there are human activities and ecosystems which are proved to be groundwater dependent. Aquifer-aquifer interaction refers to the hydraulic connection between the two aquifers. Factors affecting aquifer connectivity are well known, however appropriate techniques to establish the extent of connectivity remain poorly understood and hence the need to employ various techniques so that the extent of connectivity between the two aquifers is established. A quantitative approach was taken where hydrogeochemical and geological mapping techniques were used to produce a detailed geological conceptual model to describe the groundwater flow direction and aquifer leakage was highlighted. Results showed that Langebaan and Elandsfontein aquifer units have similar chemical signatures with pH ranging from 7.4 to 8.2, EC values ranging from 47 to 379 mS/m, and temperature between 24.6 °C and 28.0 °C. Stable isotope signatures δ¹⁸O vs δ²H showed a mixing between confined and unconfined aquifers. Frequency VLF and magnetometer techniques indicated the presence of geological structures that formed preferential groundwater pathways. Results confirmed the lower aquifer units were linked vertically at site-specific and laterally at the confined units. The vertical leakage between the aquifers through the clay layer was more apparent in some areas compared to others. The study has shown that hydrochemical and geophysical techniques seem appropriate techniques to show the connectivity between aquifer units in the groundwater system. Only two techniques were used, the study recommends using a range of techniques in establishing the interaction between aquifer units in a groundwater system.

案例分析了在南非西海岸发现的Langebaan Road和Elandsfontein含水层。先前对地下水的研究排除了将重点放在确定含水层连通性的理想方法上，这是当前研究的重点。在本案例研究中，含水层的连通性至关重要，因为有人活动和生态系统被证明是依赖地下水的。含水层－含水层相互作用是指两个含水层之间的水力连接。影响含水层连通性的因素是众所周知的，但是，建立连通性程度的适当技术仍然知之甚少，因此需要采用各种技术，以便确定两个含水层之间的连通性程度。采用了定量方法，其中使用了水文地球化学和地质测绘技术来生成详细的地质概念模型，以描述地下水的流动方向，并强调了含水层的渗漏。结果表明，朗格班和伊兰特方丹含水层单元具有相似的化学特征，pH范围为7.4至8.2，EC值范围为47至379 mS / m，温度为24.6°C至28.0°C。稳定同位素特征δ¹⁸ øVSδ ² ħ表明限制并潜水层之间的混合。变频甚低频和磁力计技术表明存在形成优先地下水通道的地质结构。结果证实，较低的含水层单元在特定位置垂直连接，在受限单元处横向连接。与其他区域相比，在某些区域中，通过黏土层的含水层之间的垂直泄漏更为明显。研究表明，水化学和地球物理技术似乎是适当的技术，可显示地下水系统中含水层单元之间的连通性。仅使用了两种技术，研究建议使用一系列技术来建立地下水系统中含水层单元之间的相互作用。