A5045977937- Groundwater flow and contamination studies
- Hydrology and Watershed Management Studies
- Geophysical and Geoelectrical Methods
- Hydraulic Fracturing and Reservoir Analysis
- Seismic Imaging and Inversion Techniques
- Soil and Unsaturated Flow
- Reservoir Engineering and Simulation Methods
- Flood Risk Assessment and Management
- Geophysical Methods and Applications
- Groundwater and Isotope Geochemistry
- Climate change and permafrost
- Geological Modeling and Analysis
- Drilling and Well Engineering
- Climate variability and models
- Cryospheric studies and observations
- Flow Measurement and Analysis
- Advanced Numerical Methods in Computational Mathematics
- Soil erosion and sediment transport
- Electrical and Bioimpedance Tomography
- Dam Engineering and Safety
- Soil and Water Nutrient Dynamics
- Probabilistic and Robust Engineering Design
- Soil Moisture and Remote Sensing
- Peatlands and Wetlands Ecology
- Landslides and related hazards
University of Waterloo
2016-2025
Stantec (Canada)
2012
Hydraulic tomography has been proposed as an alternative site characterization method, however, relatively few field scale studies have attempted. In this paper, we characterize the highly heterogeneous glaciofluvial aquifer‐aquitard system at North Campus Research Site, located University of Waterloo, Ontario, Canada using transient hydraulic (THT). particular, performed 9 pumping tests in a network wells to image conductivity ( K ) and specific storage S s distributions (or tomograms) well...
Abstract Over the past several decades, different groundwater modeling approaches of various complexities and data use have been developed. A recently developed approach for mapping hydraulic conductivity ( K ) specific storage S s heterogeneity is tomography, performance which has not compared to other more “traditional” methods that utilized over decades. In this study, we compare seven are (1) kriging, (2) effective parameter models, (3) transition probability/Markov Chain geostatistics...
Groundwater modeling has become a vital component to water supply and contaminant transport investigations. These models require representative hydraulic conductivity ( K ) specific storage S s estimates, or set of estimates representing subsurface heterogeneity. Currently, there are number approaches for characterizing heterogeneity in varying degrees detail, but is lack consensus an approach that results the most robust groundwater with best predictive ability. The main goal this study...
The accurate characterization of fractured geologic medium, imaging fracture patterns and their connectivity have been a challenge for decades. Recently, hydraulic tomography has proposed as new method the conductivity ( K ) specific storage S s distributions media. While encouraging results obtained in field, not rigorously assessed controlled laboratory setting. In this study, we assess performance transient (THT) dolomitic rock block. block is characterized through flow‐through tests...
Remediation of subsurface contamination requires an understanding the contaminant (history, source location, plume extent and concentration, etc.), and, knowledge spatial distribution hydraulic conductivity ( K ) that governs groundwater flow solute transport. Many methods exist for characterizing heterogeneity, but most if not all require collection a large number small‐scale data its interpolation. In this study, we conduct tomography survey at highly heterogeneous glaciofluvial deposit...
Abstract The robust performance of hydraulic tomography (HT) based on geostatistics has been demonstrated through numerous synthetic, laboratory, and field studies. While geostatistical inverse methods offer many advantages, one key disadvantage is its highly parameterized nature, which renders it computationally intensive for large‐scale problems. Another issue that geostatistics‐based HT may produce overly smooth images subsurface heterogeneity when there are few monitoring interval data....
Hydraulic conductivity (K) and specific storage (S(s)) are required parameters when designing transient groundwater flow models. The purpose of this study was to evaluate the ability commonly used hydrogeologic characterization approaches accurately delineate distribution hydraulic properties in a highly heterogeneous glaciofluvial deposit. metric compare various prediction drawdown responses from three separate pumping tests. conducted at field site, where 15 m × area instrumented with four...
The main purpose of this paper was to compare three approaches for predicting solute transport. include: (1) an effective parameter/macrodispersion approach ( Gelhar and Axness 1983 ); (2) a heterogeneous using ordinary kriging based on core samples; (3) hydraulic tomography. We conducted our comparison in sandbox aquifer. aquifer first characterized by taking 48 samples obtain local‐scale conductivity K ). spatial statistics these values were then used calculate the parameters. These their...
Dense nonaqueous phase liquids (DNAPL) are prevalent at a large number of sites throughout the world. The variable release history, unstable flow, and geologic heterogeneity make spatial distribution DNAPLs complex. This causes difficulties in site remediation contributing to long-term groundwater contamination for decades centuries. We present laboratory experiments demonstrate efficacy Sequential Successive Linear Estimator (SSLE) algorithm that images DNAPL source zones. relies on fusion...
Abstract This study demonstrates the importance of including and appropriately parameterizing peatlands forestlands for basin‐scale integrated surface–subsurface models in northern boreal forest, with particular emphasis on Athabasca River Basin (ARB). With a long‐term water balance approach to ARB, we investigate reasons why downstream mean annual stream flow rates are consistently higher than upstream, despite subhumid deficit conditions regimes. A high‐resolution 3D variably saturated...
Abstract In this study, we demonstrate the effectiveness of hydraulic tomography (HT) that considers variably saturated flow processes in mapping heterogeneity both and unsaturated zones a laboratory unconfined aquifer. The successive linear estimator (SLE) developed by Mao et al. (2013c) for interpreting HT aquifers is utilized to obtain tomograms conductivity ( K ), specific storage S s zone parameters (pore size parameter α ) water content θ )) Gardner‐Russo's model. estimated are first...
For almost 80 years, deformation‐induced head changes caused by poroelastic effects have been observed during pumping tests in multilayered aquifer‐aquitard systems. As water the aquifer is released from compressive storage pumping, deformed both horizontal and vertical directions. This deformation pumped causes adjacent layers, resulting pore pressure that may produce drawdown curves differ significantly those predicted traditional groundwater theory. Although these analyzed several studies...
The development of new, large-scale tools to evaluate water resources is critical understanding the long-term sustainability this resource under future land use, climate change, and population growth. In cold humid regions it imperative that such consider hydrologic complexities associated with permafrost groundwater-surface (GW-SW) interactions, as these factors are recognized have significant influence on global cycle. work we present a physics-based, three-dimensional, fully-integrated...
Hydraulic tomography based on geostatistics has proven to be robust in characterizing subsurface heterogeneity hydraulic conductivity (K) and specific storage (Ss) through the joint inversion of drawdown records from multiple pumping tests. However, spatially variable estimates can smooth or even erroneous for areas where pumping/observation data densities are not high. Previous surveys conducted at North Campus Research Site (NCRS) University Waterloo campus Waterloo, Canada, revealed that...
The point velocity probe (PVP) is a device that can measure groundwater at the centimeter scale, and unlike devices within well screens, PVP operates while in direct contact with porous medium. Because of this feature, it was postulated could be effective measuring capillary fringe. This hypothesis tested using laboratory flow-through cell filled medium-fine sand from Canadian Forces Base Borden. constructed to simulate conditions such positioned 2.5 cm below water table 79 above table. As...