A5102785588- Forest ecology and management
- Hydrology and Watershed Management Studies
- Soil erosion and sediment transport
- Mercury impact and mitigation studies
- Forest Biomass Utilization and Management
- Soil Carbon and Nitrogen Dynamics
- Plant Water Relations and Carbon Dynamics
- Peatlands and Wetlands Ecology
- Soil and Water Nutrient Dynamics
- Tree Root and Stability Studies
- Soil and Unsaturated Flow
- Forest Management and Policy
- Hydrology and Sediment Transport Processes
- Remote Sensing and LiDAR Applications
- Seedling growth and survival studies
- Atmospheric chemistry and aerosols
- Plant responses to elevated CO2
- Soil Mechanics and Vehicle Dynamics
- Heavy metals in environment
- Atmospheric and Environmental Gas Dynamics
- Heavy Metal Exposure and Toxicity
- Toxic Organic Pollutants Impact
- Cryospheric studies and observations
- Soil Geostatistics and Mapping
- Soil Management and Crop Yield
University of New Brunswick
2012-2024
Alberta Environment and Protected Areas
2013
Watershed
2012
The King's College
1989
McGill University
1977
Summary Topography, as captured by a digital elevation model (DEM), can be used to soil moisture conditions because water tends flow and accumulate in response gradients gravitational potential energy. A widely topographic index, the wetness index (SWI), was compared with new algorithm that produces cartographic depth‐to‐water (DTW) based on distance surface slope. Both models reflect tendency for saturated. 1 m resolution Light Detection Ranging (LiDAR) DEM 10 conventional photogrammetric...
Abstract. Trafficking wet soils within and near stream lake buffers can cause soil disturbances, i.e. rutting compaction. This – in turn lead to increased surface flow, thereby facilitating the leaking of unwanted substances into downstream environments. Wet mires, streams lakes have particularly low bearing capacity are therefore more susceptible rutting. It is important model map extent these areas associated wetness variations. now be done with adequate reliability using a high-resolution...
With increasing scarcity of natural resources, there is a need to provide resource managers and planners with maps that reliably inform about areas vulnerable hydrological risks, including ephemeral intermittent flows. This paper demonstrates the newly developed Wet-Areas Mapping (WAM) process using LiDAR-based point cloud data addresses some these needs. done by portraying local flow patterns, soil drainage, moisture regimes vegetation type across mapped in numerically robust consistent...
This paper presents a new method to seamlessly calculate thermal conductivity for various soil conditions, from loose compact, organic mineral, fine coarse textured, frozen unfrozen, and dry wet. The is considered as multi-phase system, containing air, water (liquid, ice), particles finer (organic matter, minerals) coarser (gravel) than 2 mm. extends the general portability of earlier Johansen (1975) method, this generalization was fine-tuned empirically with data soil, gravel, peat drawn...
Abstract A conventional, photogrammetrically derived digital elevation model (DEM; 10 m resolution) and a light detection ranging (lidar)‐derived DEM (1 were used to the stream network of 193 ha watershed in Swan Hills Alberta, Canada. Stream networks, modelled using both hydrologically corrected uncorrected versions DEMs from aerial photographs, compared. The actual network, mapped field, was as verification. lidar DEM‐derived most accurate representation field‐mapped being more even than...
Epidemiologic studies commonly use mercury (Hg) level in hair as a valid proxy to estimate human exposure methylmercury (MeHg) through fish consumption. This study presents the results yielded by complete data set on consumption habits, Hg levels edible resources, and corresponding accumulation hair, gathered three distinct communities of eastern Canada. For one these communities, average concentration was 14 times less than expected value based calculated daily oral current knowledge MeHg...
Wild and farmed Atlantic salmon (Salmo salar L.) cod (Gadus morhua were collected to assess changes in mercury with size wild vs. fish. Mercury concentrations compared Health Canada United States Environmental Protection Agency consumption guidelines. Lipid dilution of was examined by comparing lipid-extracted (LE) non-lipid-extracted (NLE) flesh samples both the liver significantly lower than similar fork length (P<0.001), possibly due growth rapidly growing higher LE tissue NLE (P<0.05),...
A modular approach is presented to assess terrain-specific soil trafficability in terms of resistance penetration and machine-specific rut depths. These modules address: (1) cone (cone index, or CI) as affected by moisture, texture pore space (Module 1), (2) machine-induced depths (single-pass multi-cycles) wheel loads, tire specifications CI (accounting for depth compactable soil, Module 2), (3) temporal variations hydrothermal conditions, CI, potential due daily moisture temperature 3),...
Soil resistances to penetration were probed with a hand-held soil cone penetrometer across ridge-to-depression transects for two contrasting study areas in Alberta, Canada: one the foothills west of Calgary, and boreal plain north Peace River. The resulting index values (CI) related plot-measured moisture, density, texture, organic matter content, depth, elevation, slope, cartographic depth-to-water (DTW) by way multiple regression analysis. Elevation, DTW, associated flow accumulation...
From the rigorous hydrodynamic interaction theory of a pair neutral hard spheres radius b in viscous fluid undergoing simple shear flow, two-body collision has been developed which corrects classical Smoluchowski based on rectilinear approach by applying modern (and experimentally verified) curvilinear approach. The difficulties defining are eliminated sphere ρ m around reference sphere. In this way correction factors for area cross-section, frequency, average doublet life time, and...
The forest floor of a mature, naturally regenerated conifer stand on well-drained podzolic soil in the Central Uplands New Brunswick was sampled systematically. forest-floor properties measured were: oven-dried mass per unit area, depth, moisture content, pH, potassium-chloride-extractable NH 4 -N and NO 3 -N, water-soluble phosphate, ammonium-acetate-extractable K, Mg, Ca. Total elemental C, N, P, Ca, Al, Fe concentrations were also determined. Coefficients variation varied from 0.066...
Elemental concentrations (H, Ca, Mg, K, Na, NH 4 -N, NO 3 P) and water flux data for precipitation stream discharge as well ion concentration soil solutions were collected summarized the Hayden Brook (HB) Narrows Mountain (NMB) watersheds of Nashwaak Experimental Watershed Project (NEWP) in Central New Brunswick. concentrations, fluxes from both compared pre- post-harvest periods (1972–1978 1978–1984, respectively). For streamwater solutions, elemental typically highest late summer to fall,...
Soil resistance to penetration and rutting depends on variations in soil texture, density weather-affected changes moisture content. It is therefore difficult know when where off-road traffic could lead rutting-induced disturbances. To establish some of the empirical means needed enable "when" "where" determinations, an effort was made model over time for three contrasting forest locations Fredericton, New Brunswick: a loam clay ablation/ basal till, sandy alluvium. Measurements were taken...