A5050103287- Groundwater and Isotope Geochemistry
- Groundwater and Watershed Analysis
- Geophysical and Geoelectrical Methods
- Groundwater flow and contamination studies
- Hydrology and Watershed Management Studies
- Geochemistry and Geologic Mapping
- Mine drainage and remediation techniques
- Radioactivity and Radon Measurements
- Flood Risk Assessment and Management
- Heavy metals in environment
- Geophysical Methods and Applications
- Water Quality and Pollution Assessment
- Nuclear and radioactivity studies
- Hydrology and Drought Analysis
- Transboundary Water Resource Management
- Aquatic Ecosystems and Phytoplankton Dynamics
- Karst Systems and Hydrogeology
- Water resources management and optimization
- Tailings Management and Properties
- Radiation Dose and Imaging
- Graphite, nuclear technology, radiation studies
- Hydrological Forecasting Using AI
- Arsenic contamination and mitigation
- Hydraulic Fracturing and Reservoir Analysis
- Fluoride Effects and Removal
University of the Witwatersrand
2016-2025
University of Malawi
2023
Malawi University of Business and Applied Sciences
2023
Abstract Groundwater forms the basis of water supplies across much Africa and its development is rising as demand for secure increases. Recharge rates are a key component assessing groundwater potential, but have not been mapped Africa, other than from global models. Here we quantify long-term average (LTA) distributed recharge period 1970–2019 134 ground-based estimates upscaled statistically. Natural diffuse local focussed recharge, where this mechanism widespread, included discrete...
Coal mining and combustion have the potential to increase exposure radon, a form of radioactive gas recognized as one major contributors lung cancer incidents. In South Africa, coal is used primary energy source for producing electricity heating, predominantly in informal settlements township communities. Most existing coal-fired power plants are found Mpumalanga province. This paper presents long-term radon (222Rn) measurements dwellings surrounding centres province evaluates their...
Abstract. Impacts of climate and land cover changes on streamflow were assessed using a hydrological modeling. The precipitation runoff modeling system the US Geological Survey was modified in order to consider wetlands as separate response unit. Initial model parameters obtained from previously modeled adjacent catchment subsequent calibration validation carried out. periods divided into three. period five years (1981–1986). two: 1 (1986–1991) 2 (1996–2002). Model performance evaluated by...
Radon gas has long been identified as a human carcinogen. The purpose of this study was to understand the occurrence radon in West Rand region, located west city Johannesburg, South Africa, and investigate its potential health effects. In study, sampling rocks, tailings, construction materials carried out for geochemical analyses. For characterisation radon, 60 monitors (RGMs) were installed indoor outdoor environments. results showed that mine tailings contain high uranium levels, with...
Abstract. Groundwater recharge is a key hydrogeological variable that informs the renewability of groundwater resources. Long-term average (LTA) provides measure replenishment under prevailing climatic and land-use conditions therefore considerable interest in assessing sustainability withdrawals globally. This study builds on modelling results by MacDonald et al. (2021), who produced first LTA map across Africa using linear mixed model (LMM) rooted 134 ground-based studies. Here,...
Understanding the groundwater dynamics is very important for strategic management of water resource as urbanization and population growth put South Africa’s current supply under tremendous stress. The resources potential quality characteristics greater Johannesburg area, was thoroughly assessed using hydrogeochemical environmental isotope techniques. results geochemical stable investigations help understand setting. Mixing process fresh polluted taking place at shallow zones within weathered...
Research Article| June 01, 2015 SURFACE WATER AND GROUNDWATER INTERACTION IN THE UPPER CROCODILE RIVER BASIN, JOHANNESBURG, SOUTH AFRICA: ENVIRONMENTAL ISOTOPE APPROACH T.A. ABIYE; ABIYE School of Geosciences, University the Witwatersrand, Private Bag X3, P.O. Box Wits 2050, Johannesburg, South Africa, e-mail: tamiru.abiye@wits.ac.za Search for other works by this author on: GSW Google Scholar H. MENGISTU; MENGISTU Wayne County Community College District, 801 W Fort Street, Detroit, MI,...
Molototsi sand river, Limpopo, South Africa. Ephemeral rivers are common throughout the world's dryland regions, often providing a water source where more conventional sources unavailable. However, these alluvial aquifers poorly represented in literature. Extensive field investigations allowed estimation of stored volume and characterisation an aquifer. Computed aquifer properties included hydraulic conductivity 20–300 m/d, porosity 38–40%, thickness 0–6 m. Dykes other subcrops commonly...
Recharge dynamics, possible flow path and human impact within the crystalline aquifer of Johannesburg area have been described based on hydrogeochemical characteristics environmental isotopes. The dominant circulation zone has also identified in study. Understanding groundwater dynamics is very important for strategic management resource as country dependent its different activities. It observed that mixing fresh polluted takes place at shallow zones weathered rocks dissolution cavities...
The mining and processing of naturally occurring radioactive materials (NORMs) could result in elevated levels natural radionuclides the environment. gold goldfields Witwatersrand Basin South Africa has resulted numerous tailing dams that have high concentrations NORM bearing residue. aim this study was to evaluate radioactivity dams, soils rocks, consequential radiological exposure public areas Gauteng Province, Africa. activity 238U, 232Th, 40K were assessed using a gamma ray spectrometer...