GroMoPo Metadata for Wadi Ham FEFLOW model

The control and management of seawater intrusion in coastal aquifers is a major challenge in the field of water resources management. Seawater intrusion is a major problem in the coastal aquifer of Wadi Ham, United Arab Emirates, caused by intensive groundwater abstraction from increased agricultural activities. This has caused the abandonment of salinized wells and ultimately affected farming activities and domestic water supply in the area. In this study, the 3D finite element groundwater flow and solute transport model is developed using FEFLOW to simulate pumping of brackish water from the intrusion zone to control seawater intrusion in the aquifer. The model was calibrated and validated with available records of groundwater levels and salinity distribution. Different simulation scenarios were conducted to obtain optimum pumping locations, rates as well as a number of wells. A comparison between scenarios of non-pumping and pumping of brackish water was conducted. Results showed an increase in the concentration of groundwater salinity under the non-pumping scenario, while it decreased under the pumping scenario. Under the non-pumping scenario, isoline 30,000 mgl(-1) was observed to have intruded into the south-eastern part of the aquifer, while the maximum isoline observed for the same area under the pumping scenario was 20,000 mgl(-1). This result showed an overall improvement in the quality of groundwater and ultimately halted seawater intrusion in the aquifer.海岸含水层海水入侵的防控与管理是水资源管理领域的重大难题。海水入侵是阿拉伯联合酋长国（阿联酋）哈伊谷（Wadi Ham）海岸含水层的主要问题，其成因系农业活动扩张引发的地下水超采。该问题已导致盐化水井被废弃，最终对当地农业生产与生活供水造成负面影响。本研究采用FEFLOW构建三维有限元地下水水流与溶质运移模型，以模拟从入侵区域抽取微咸水的过程，从而管控含水层内的海水入侵。随后，研究团队利用已获取的地下水位与盐度分布实测数据对模型进行校准与验证。通过开展多组模拟情景，确定了最优抽水井位置、抽水量及井群布设方案，并对比了非抽水与抽取微咸水两种情景的模拟结果。结果表明：非抽水情景下，地下水盐度浓度持续升高；而抽水情景下盐度浓度则呈下降趋势。非抽水情景中，30000 mg/L的等盐度线已侵入含水层东南部区域；而抽水情景下该区域的最高等盐度线仅为20000 mg/L。本研究结果显示，含水层地下水水质整体得到显著改善，且最终遏制了海水入侵现象。