A5008733066- Groundwater flow and contamination studies
- Mine drainage and remediation techniques
- Groundwater and Isotope Geochemistry
- Soil and Unsaturated Flow
- Arsenic contamination and mitigation
- Hydraulic Fracturing and Reservoir Analysis
- Hydrocarbon exploration and reservoir analysis
- Atmospheric and Environmental Gas Dynamics
- Methane Hydrates and Related Phenomena
- Radioactive element chemistry and processing
- Grouting, Rheology, and Soil Mechanics
- Mining and Resource Management
- Soil and Water Nutrient Dynamics
- Water Quality and Pollution Assessment
- Geochemistry and Elemental Analysis
- Tailings Management and Properties
- CO2 Sequestration and Geologic Interactions
- Hydrology and Watershed Management Studies
- Heavy metals in environment
- Seismic Imaging and Inversion Techniques
- Phosphorus and nutrient management
- Geochemistry and Geologic Mapping
- Landfill Environmental Impact Studies
- Fluoride Effects and Removal
- Geophysical and Geoelectrical Methods
University of British Columbia
2015-2024
Universidad Braulio Carrillo
2022
University of Waterloo
1987
High levels of arsenic in well water are causing widespread poisoning Bangladesh. In a typical aquifer southern Bangladesh, chemical data imply that mobilization is associated with recent inflow carbon. concentrations radiocarbon-young methane indicate young carbon has driven biogeochemical processes, and irrigation pumping sufficient to have drawn the depth where dissolved at maximum. The results field injection molasses, nitrate, low-arsenic show organic or its degradation products may...
Accumulation of magnesium ammonium phosphate hexahydrate (struvite) on surfaces in contact with wastewater, especially anaerobic sludge digestion and post-digestion processes, is a widely reported problem the wastewater treatment industry. The solubility thermodynamic properties struvite at different temperatures was studied. Struvite products between 10 60 'C were determined by variation solution ionic strength extrapolation to zero strength, using an appropriate activity coefficient model....
Abstract Numerical groundwater flow modeling, reverse particle tracking, and environmental tracers are used to locate the source of geogenic As affecting an aquifer in West Bengal. The is hosted by point‐bar sands deposited a meandering fluvial environment. Wells tapping exhibit concentrations up 531 μg/L. High‐As groundwaters recharged ponds marking abandoned river channel. traced underlying fine‐grained channel‐fill sediments. Arsenic release within these sediments accompanied concomitant...
Abstract Subsurface natural gas release from leaking oil and wells is a major environmental concern. Gas migration can cause aquifer contamination, explosive conditions in soil gas, greenhouse emissions. controlled by complex interacting processes, thus constraining the distribution magnitude of “fugitive gas” emissions remains challenge. We simulated wellbore leakage vadose zone through experiment demonstrate that fugitive be directly influenced barometric pressure changes. Decreases...
Microbial populations and microbe-mineral interactions were examined in waste rock characterized by neutral drainage (NRD). Samples of three primary sulfide-bearing types (i.e., marble-hornfels, intrusive, exoskarn) collected from field-scale experiments at the Antamina Cu–Zn–Mo mine, Peru. communities within all samples dominated neutrophilic thiosulfate oxidizing bacteria. However, acidophilic iron sulfur oxidizers present intrusive bulk circumneutral pH drainage. The extensive development...
Abstract This paper summarizes international state-of-the-art applications and opportunities for employing deploying hydrological, geochemical, isotopic tools in an integrated manner investigations of mining operations. It is intended to aid formulation more approaches evaluating the overall sustainability projects. The focus particularly on mine waters, including: environmental water sources, dynamics, as a source vector pollution wider environment. guidance generic projects not just...
Abstract Petroleum resource development is creating a global legacy of active and inactive onshore energy wells. Unfortunately, portion these wells will exhibit gas migration (GM), releasing fugitive (FG) into adjacent geologic formations overlying soils. Once mobilized, FG may traverse the critical zone, impact groundwater, emit to atmosphere, contributing greenhouse‐gas emissions. Understanding GM has increased in recent years but significant gaps persist knowledge (1) incidence causes GM,...
The scales at which model parameters are measured with local field tests distributed on a sampling network examined. Two defined to characterize the problem: (1) measurement scale associated resolution of single test, and (2) scale, separation between samples network. Using spatial filtering approach, it is shown that measurements can only resolve larger‐scale component parameter field. smaller‐scale not seen by measurements, here called subgrid component, vary larger than smaller scale....
A multiyear flow and conservative tracer test has been carried out in unsaturated mine waste rock to examine the physical mechanisms by which water moves through this coarse, heterogeneous, granular material. The experimental system a footprint of 8 m × m, is 5 high, built on contiguous grid 16 zero‐tension lysimeters. chloride was applied during single rainfall event. Subsequently, subject both natural events no further added. Water transport monitored using situ measurements moisture...
Abstract This paper focuses on surface–subsurface water exchange in a steep coarse‐bedded stream with step‐pool morphology. We use both flume experiments and numerical modelling to investigate the influence of discharge, channel slope sediment hydraulic conductivity hyporheic exchange. The model reach, whose topography is scaled from natural river, consists three units 0.1‐m step heights, discharges ranging between base over‐bankfull flows (scaled values 0.3–4.5 l/s) slopes 4% 8%. Results...
Most studies on the weathering of mine waste rock focus generation acidic drainage with high metal concentrations, whereas metal(loid) release under neutral-rock (NRD) conditions has received limited attention. Here, we present geochemical and mineralogical data from a long-term (>10 years) kinetic testing program 50 waste-rock field barrels at polymetallic Antamina in Peru. The most lithologies experiments generated circumneutral to alkaline (6 < pH 9) but concentrations oxyanion-forming...
We consider parameters determined by the inversion of slug‐test head recovery data with homogeneous‐parameter model Cooper et al. [1967] to be weighted spatial averages transmissivity and storage defined at a smaller scale. quantify averaging using power‐average filter expression. determine form function power exponent numerically simulated data. The that describes how smaller‐scale is slug tests displays an approximate 1/ r 2 behavior, radial distance from well. radius cylinderical volume...