报告题目：Hydrogeochemical processes controling fluoride enrichment and management

                   of hard rock aquifers   in South Africa            

报  告 人：V. Elumalai教授

邀  请 人：刘德地 教授

时      间：2022年6月14日（星期二）下午3:00

会议链接：https://meeting.tencent.com/dm/MK1RauF7U6cg

腾讯视频会议（ID:993 734 198）

报告人简介：

Prof Vetrimurugan Elumalai is a Professor and Head of the Department of Hydrology, Faculty of Science, Agriculture and Engineering, University of Zululand, South Africa. He is also working as a guest professor at Chang’an University China since 2020. He is one of the National Research Foundation rated researchers (C2). He has more than 15 years of experience in the field of Hydrogeology and environmental geochemistry. He has published more than 50 articles published in highly reputed journals. His focused research specialisation area is on groundwater and surface water studies including hydrological modelling, groundwater and surface water quality assessment, groundwater and surface water contamination, monitoring and management, groundwater modelling for sustainable water resources and environmental geochemistry. Though he has broad scope of research activities, currently, he is working dynamically on the groundwater and surface water quality related studies in entire South Africa and the sediment geochemistry in the Southern African coastal areas. He is involved in research collaboration with various countries, including Mexico, Brazil, Russia, India, Germany, China and Saudi Arabia etc,. He is also serving as an editorial board member/guest editor in Chemosphere, Water research and Environmental Earth Sciences. He is the registered scientist with SACNASP as Pr.Sci.Nat. He is a life member of the International Association of Hydrogeologists, International Association of Hydrological Sciences and Geological Survey of South Africa. He has received Emerging researcher award in 2018 and Young researcher award in 2019 from University of Zululand.

报告简介：

The study on high fluoride contaminated fractured rock aquifer in South Africa was carried out using geochemical, groundwater modelling and GIS and remote sensing techniques. The groundwater with high fluoride is associated with NaCl water types. Mineral weathering, evaporation and wastewater infiltration were the major processes. PHREEQC modelling indicates the decreasing carbonate mineral saturation with increasing salinity due to evaporation whereas fluorite saturation increases with increasing F content being one of the prime controlling factors. PCA provided four factors and justifies the role of mineral weathering, evaporation, ion exchange, longer residence time and anthropogenic impacts on water chemistry. The groundwater quality in more than 50% of areas is degrading due to fluoride contamination and requires remedial measures to protect water quality. The AHP approach and Catastrophe theory were used to determine acceptable zones by assigning weights to 10 parameters and their sub-criteria. It was discovered that, 23% and 26% of the catchment is encompassed by 'Low' recharge zones, and 0.42% and 0.09% by 'Very good', for the AHP and Catastrophe theory respectively. Hard rock complexion of the catchment attributes significant limited presence of ‘Good’ and ‘Very good’ zones. Groundwater model prediction results indicated that under the current scenario, groundwater head would decline by 5 m below ground level by 2040, leading to a major threat to hard rock aquifer and further leading to high concentration of ions. Groundwater recharge would be an ideal technique to restore and protect the groundwater from contamination. It is suggested to implement recharge structures to increase the groundwater recharge for safe and sustainable management of aquifer system.

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