HYDROGEOCHEMICAL INTERACTIONS AND DYNAMICS OF FLUORIDE AND ARSENIC TRANSPORT FROM GROUNDWATER AQUIFERS TO STREAMS: INSIGHTS FROM LONG-TERM ISOTOPES TRACER STUDIES AND CLIMATE CHANGE IMPACTS
Presented by: Elys Nehemia Mwigamba
Produced by: IAH NSW
Date: Tuesday 11 February 2025
Time: 17:30 for an 18:00 start
Where: WSP Office – Level 27
Online: To be provided closer to the event
Abstract
Groundwater contamination with fluoride (F-) and arsenic (As) poses significant human health problems especially in region that rely in groundwater for drinking purpose and other domestic uses. This study aims to investigate the hydrogeochemical interactions (evolution of groundwater) and dynamics of fluoride and arsenic transport from groundwater aquifers to streams, focusing on long-term isotopic tracer studies and the impacts of climate change. The study explores the chemical processes governing fluoride and arsenic mobilization, in aquifer systems and their subsequent transfer to surface water. Stable isotopes of hydrogen (δ2H) and oxygen (δ18O) will be employed to trace the sources (origin), flow paths, and residence times of groundwater while also determining the recharge zone of groundwater. The study will also evaluate how climate change variations in precipitation and temperature influence groundwater recharge, hydrodynamics, and the mobilization of these contaminants through modelling. The goal is to inform sustainable groundwater management and safeguard water quality for communities relying on this resource. This work is expected to cover areas of Africa, including Morocco, Ethiopia, Tanzania, Zimbabwe, Botswana, South Africa, Nigeria, Burkina Faso, and Benin.
Bio
Elys Nehemia Mwigamba is a complete hydrogeologist and environmental expert with a Masters degree in Hydrogeology and Water Resources Management. With over seven years of professional experience, Elys has made significant contributions to the field of water resources, particularly in groundwater protection from contamination. Throughout his career, Elys has been involved in various impactful projects across Tanzania, focusing on protecting groundwater from pollution including heavy metals in mining and non-mining areas, but also ensuring communities utilize safe and clean drinking water. His expertise covers a wide range of specialized areas, including geophysics, geochemistry, isotopes, groundwater modelling etc. These skills have enabled him to effectively assess and manage groundwater systems in different aquifer types. He is dedicated in promoting sustainable water resource management and advancing scientific understanding to protect vital groundwater systems around the globe.
