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Articles de revues sur le sujet « Geology - Ontario - Bonheur area »

Auteur : Grafiati

Publié le 4 juin 2021

Mis à jour le 29 juillet 2025

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1

McDougall, Raymond. "Mineral Highlights from the Bancroft Area, Ontario, Canada." Rocks & Minerals 94, no. 5 (2019): 408–19. http://dx.doi.org/10.1080/00357529.2019.1619134.

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Lykova, Inna, John Montgomery, and John Biczok. "Strange Scepter Quartz from the Lyndhurst Area, Ontario, Canada." Rocks & Minerals 97, no. 3 (2022): 254–59. http://dx.doi.org/10.1080/00357529.2022.2028100.

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Lykova, Inna, John Montgomery, and John Biczok. "Strange Scepter Quartz from the Lyndhurst Area, Ontario, Canada." Rocks & Minerals 97, no. 3 (2022): 254–59. http://dx.doi.org/10.1080/00357529.2022.2028100.

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Kile, Daniel E. "Mineralogy of the Amethyst Mines in the Thunder Bay Area, Thunder Bay, Ontario, Canada." Rocks & Minerals 94, no. 4 (2019): 306–43. http://dx.doi.org/10.1080/00357529.2019.1595939.

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Fralick, Philip W., and Andrew D. Miall. "Sedimentology of the lower huronian supergroup (early proterozoic), Elliot lake area, Ontario, Canada." Sedimentary Geology 63, no. 1-2 (1989): 127–53. http://dx.doi.org/10.1016/0037-0738(89)90075-4.

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Sharpe, David R., and Peter J. Barnett. "Significance of Sedimentological Studies on the Wisconsinan Stratigraphy of Southern Ontario." Géographie physique et Quaternaire 39, no. 3 (2007): 255–73. http://dx.doi.org/10.7202/032607ar.

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ABSTRACTDetailed facies mapping along Lake Erie and Lake Ontario Bluffs, plus other studies illustrate that sedimentological studies, especially those with geomorphic or landform control, have had three main effects on the Wisconsinan stratigraphy of Ontario: (1) improved understanding of depositional processes and environments of several major rock stratigraphic units, without altering the stratigraphic framework, (2) aided correlation of drift sequences, and (3) questioned previous interpretations and stratigraphic correlations of drift sequences. Thus sedimentological analysis can not be se

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Cooper, A. J. "Waste disposal site selection techniques in Quaternary terraine Ontario, Canada." Geological Society, London, Engineering Geology Special Publications 7, no. 1 (1991): 211–17. http://dx.doi.org/10.1144/gsl.eng.1991.007.01.19.

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AbstractThick and predictable deposits of fine grained Quaternary materials have been used for the siting of waste management facilities in Ontario. The search for such sites is founded on the application of techniques in Quaternary geology and hydrogeology. Two examples are presented. Oxford County is located southwest of Toronto in an area of parallel morainic ridges separated by flat till plains. Conventional wisdom would focus on the till plains for thick, consistent fine grained Quaternary Sediments. However, the careful analysis of the Quaternary stratigraphy and glacial history revealed

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Fee, E. J., and R. E. Hecky. "Introduction to the Northwest Ontario Lake Size Series (NOLSS)." Canadian Journal of Fisheries and Aquatic Sciences 49, no. 12 (1992): 2434–44. http://dx.doi.org/10.1139/f92-269.

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The rationale, design, and limitations of the Northwest Ontario Lake Size Series (NOLSS) research program are described. The primary purpose of NOLSS is to discover how lake size per se influences limnological and fisheries phenomena, so that conclusions drawn from studies of particular lakes can be rigorously scaled and applied to lakes of other sizes. NOLSS consists of six lakes located in a remote wilderness region of Northwest Ontario. These lakes were chosen for their geological, hydrological, and morphological similarity (Canadian Shield geology; water renewal time> 5 yr; fully strati

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Motazedian, Dariush, and James Hunter. "Development of an NEHRP map for the Orleans suburb of Ottawa, Ontario." Canadian Geotechnical Journal 45, no. 8 (2008): 1180–88. http://dx.doi.org/10.1139/t08-051.

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The average shear-wave velocity to a depth of 30 m (Vs30) has been obtained for 73 sites in the Orleans area in the northeast part of the City of Ottawa. Measurements of Vs30 were made using both ground surface reflection and refraction methods. In addition, borehole data was used to estimate Vs versus depth profiles using average Vs values assigned to distinct geological units. High values of Vs (>1500 m/s) were obtained in areas of thin surficial sediments overlying Paleozoic bedrock, and low Vs values (<180 m/s) were calculated in areas of thick late–post-glacial clay. The Vs30 values

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10

Mohajer, Arsalan A. "Seismicity and Seismotectonics of the Western Lake Ontario Region." Géographie physique et Quaternaire 47, no. 3 (2007): 353–62. http://dx.doi.org/10.7202/032963ar.

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ABSTRACTThe western Lake Ontario region, a traditionally perceived area of low seismic risk, is densely populated and is home to, among other critical facilities, the nuclear reactors of Pickering and Darlington. These and other characteristics of the region call for improved estimates of seismic hazard. Due to a lack of understanding of the causative geological sources and recurrence characteristics of the reported seismic activity, there is considerable uncertainty regarding estimated ground motion parameters, a fundamental component of seismic hazard assessments. To attempt to improve the d

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Eyles, N., and K. W. F. Howard. "A hydrochemical study of urban landslides caused by heavy rain: Scarborough Bluffs, Ontario, Canada." Canadian Geotechnical Journal 25, no. 3 (1988): 455–66. http://dx.doi.org/10.1139/t88-051.

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Scarborough Bluffs is a 15 km long stretch of the Lake Ontario shoreline east of downtown Toronto. This heavily urbanized area currently represents Canada's most serious erosion problem. The worst affected zone is 1.5 km long and lies along South Marine Drive where 50 m high bluffs are failing by shallow retrogressive failures of jointed glacial clays over underlying deltaic sands and clays. The erosion rate is about four times that for the coastline as a whole.Heavy rains in the Toronto area in August and September 1986 produced a spate of slope failures and mud flows. Particularly heavy stor

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Behnia, Pouran, Jeff Harris, Ross Sherlock, Mostafa Naghizadeh, and Rajesh Vayavur. "Mineral Prospectivity Mapping for Orogenic Gold Mineralization in the Rainy River Area, Wabigoon Subprovince." Minerals 13, no. 10 (2023): 1267. http://dx.doi.org/10.3390/min13101267.

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Random Forest classification was applied to create mineral prospectivity maps (MPM) for orogenic gold in the Rainy River area of Ontario, Canada. Geological and geophysical data were used to create 36 predictive maps as RF algorithm input. Eighty-three (83) orogenic gold prospects/occurrences were used to train the classifier, and 33 occurrences were used to validate the model. The non-Au (negative) points were randomly selected with or without spatial restriction. The prospectivity mapping results show high performance for the training and test data in area-frequency curves. The F1 accuracy i

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DICKIN, A. P., and R. H. MCNUTT. "An application of Nd isotope mapping in structural geology: delineating an allochthonous Grenvillian terrane at North Bay, Ontario." Geological Magazine 140, no. 5 (2003): 539–48. http://dx.doi.org/10.1017/s0016756803008070.

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Fifty new Nd isotope analyses are presented from the North Bay area of the Grenville Province in Ontario. These data are used to map the extent of an allochthonous Grenvillian terrane which is an outlier of the Allochthonous Polycyclic Belt of the Grenville Province. Amphibolite facies orthogneisses from the allochthonous terrane have depleted mantle Nd model ages (TDM) below 1.8 Ga, whereas the gneisses of the structurally underlying parautochthon almost invariably have model ages above 1.8 Ga. The distribution of model ages is consistent with the distribution of distinct types of metabasic r

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Hicock, Stephen R. "Calcareous Till Facies North of Lake Superior, Ontario: Implications for Laurentide Ice Streaming." Géographie physique et Quaternaire 42, no. 2 (2007): 120–35. http://dx.doi.org/10.7202/032719ar.

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ABSTRACTIn the Geraldton and Hemlo areas distantly-derived carbonate tills lie between slightly to non-calcareous tills and can be distinguished by textural, carbonate, and clast compositions. Their occurrence and uniform character over large areas of the Shield attest to high sediment flux by rapid movement of distal debris within the southern part of the Laurentide Ice Sheet. This is consistent with low surface profiles reconstructed for the Superior and Michigan lobes which were likely fed by ice north of Superior and probably affected by ice streaming. Till deposition in the Geraldton and

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MIALL, ANDREW D. "Sedimentation on an early Proterozoic continental margin under glacial influence: the Gowganda Formation (Huronian), Elliot Lake area, Ontario, Canada." Sedimentology 32, no. 6 (1985): 763–88. http://dx.doi.org/10.1111/j.1365-3091.1985.tb00733.x.

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Cox, Leif H., Michael S. Zhdanov, Douglas H. Pitcher, and Jeremy Niemi. "Three-Dimensional Inversion of Induced Polarization Effects in Airborne Time Domain Electromagnetic Data Using the GEMTIP Model." Minerals 13, no. 6 (2023): 779. http://dx.doi.org/10.3390/min13060779.

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This paper discusses the physical and mathematical principles of the airborne induced polarization (IP) method. The possibility of extracting information about the IP properties of rocks from airborne survey data has become a subject of active research recently. We introduce a method for the joint inversion of the airborne EM data into the electrical conductivity and IP parameters based on the generalized effective-medium theory of induced polarization (GEMTIP). We also present the results of the inversion of the airborne EM data collected over the Echum Project Area, in Northwestern Ontario,

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17

Morris, T. F., and R. I. Kelly. "Origin and physical and chemical characteristics of glacial overburden in Essex and Kent counties, southwestern Ontario." Canadian Journal of Earth Sciences 34, no. 3 (1997): 233–46. http://dx.doi.org/10.1139/e17-022.

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The overburden of Essex and Kent counties, southwestern Ontario, has been described as consisting of a clayey silt to silty clay till overlying a gravelly unit resting on bedrock. Recent Quaternary geology mapping has identified additional materials and redefined the origin of others by determining the stratigraphic position and physical and geochemical properties of materials encountered in a sonic drilling program and field mapping. Catfish Creek Till was deposited on the bedrock surface during the Nissouri Stadial as ice advanced south over the area. As ice retreated during the Erie Interst

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Hugenholtz, Chris H., and Denis Lacelle. "Geomorphic Controls on Landslide Activity in Champlain Sea Clays along Green’s Creek, Eastern Ontario, Canada." Géographie physique et Quaternaire 58, no. 1 (2006): 9–23. http://dx.doi.org/10.7202/013108ar.

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AbstractLandslides in Champlain Sea clays have played an important role in shaping Eastern Ontario’s landscape. Despite extensive research, there is a limited understanding of the relations between landslide activity, climatic controls, and the geomorphic evolution of river valleys in Champlain Sea clay deposits. With these issues in mind, a study was undertaken to determine the controls on the spatio-temporal distribution of contemporary landslide activity in valley slopes composed of Champlain Sea clay. The study area was the Green’s Creek valley located in the east end of Ottawa, Ontario. O

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Beavon, Roy V. "Archean neptunian fissures and early history of the Destor-Porcupine fault zone, Timmins, Ontario, Canada." Canadian Journal of Earth Sciences 35, no. 12 (1998): 1402–7. http://dx.doi.org/10.1139/e98-073.

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Neptunian dikes and fissures are intimately associated with a minor Archean sedimentary basin near Timmins, Ontario, in the southwestern part of Abitibi Subprovince of the Canadian Shield. These structures are associated with the late Archean Timiskaming unconformity, and were formed by clastic sedimentation in fissures opened by the reactivation and dilation of basement faults along a major crustal shear. A "pull-apart" origin is indicated for the sedimentary basin by published township maps and the underground geology of the Dome gold mine. The neptunian dikes and fissures are discussed in r

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Husain, Muin M., John A. Cherry, Scott Fidler, and Shaun K. Frape. "On the long-term hydraulic gradient in the thick clayey aquitard in the Sarnia region, Ontario." Canadian Geotechnical Journal 35, no. 6 (1998): 986–1003. http://dx.doi.org/10.1139/t98-057.

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Much of the southwestern part of Ontario between Lake Huron and Lake Erie has a thin freshwater aquifer overlain by an aquitard of Late Pleistocene clayey glaciolacustrine deposits and underlain by a thick Devonian shale aquitard. In a large area east of the St. Clair River, where the Quaternary aquitard is 30-50 m thick, groundwater of Pleistocene origin (identified by 18O and 2H signature) occurs in the aquifer and in the bottom part of the Quaternary aquitard. Numerous piezometer nests in the aquitard show a downward hydraulic gradient with depth. In some areas, the aquitard has downward gr

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CONIGLIO, M., and A. E. WILLIAMS-JONES. "Diagenesis of Ordovician carbonates from the north-east Michigan Basin, Manitoulin Island area, Ontario: evidence from petrography, stable isotopes and fluid inclusions." Sedimentology 39, no. 5 (1992): 813–36. http://dx.doi.org/10.1111/j.1365-3091.1992.tb02155.x.

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Simms, Paul H., and Ernest K. Yanful. "Some insights into the performance of an experimental soil cover near London, Ontario." Canadian Geotechnical Journal 36, no. 5 (1999): 846–60. http://dx.doi.org/10.1139/t99-046.

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An experimental soil cover constructed near London, Ontario, 23.2 m × 15.2 m in plan area, has been monitored for 2 years for percolation and water-content data. The cover was a multilayer system consisting of a compacted till barrier soil placed between evaporation and drainage barriers of sandy gravel. Half of the cover was capped with coarse stone to prevent erosion and the other half was covered with topsoil to facilitate revegetation. High percolation rates and substantial desiccation of the barrier soil were reported under the topsoil protection layer. Unsaturated-saturated liquid and va

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Walter, Callum, Fouad Faraj, Georgia Fotopoulos, and Alexander Braun. "Augmenting geological field mapping with real-time, 3-D digital outcrop scanning and modeling." Geosphere 18, no. 2 (2022): 762–79. http://dx.doi.org/10.1130/ges02452.1.

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Abstract Hand scanners are compact, lightweight, and capable of generating 3-D digital models. Although they do not compare to conventional methods (terrestrial laser scanning and photogrammetry) in terms of coverage, resolution, and accuracy, they offer increased mobility, speed, and real-time processing capabilities in the field. This study investigates the use of hand scanners for real-time, 3-D digital outcrop modeling to augment geological field mapping campaigns and highlights the advantages and the limitations. The utility of incorporating hand scanners as an additional tool for augment

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SHARMA, SAJAL, GEORGE R. DIX, and MIKE VILLENEUVE. "Petrology and potential tectonic significance of a K-bentonite in a Taconian shale basin (eastern Ontario, Canada), northern Appalachians." Geological Magazine 142, no. 2 (2005): 145–58. http://dx.doi.org/10.1017/s001675680400041x.

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A 6 cm thick K-bentonite, herein defined as the Russell Bed, occurs in an Upper Ordovician deep-basin shale succession in eastern Ontario, Canada, forming part of the distal Taconic foreland in eastern North America. The bed lies within the pygmaeus graptolite Biozone, which is about 451 to 452 Ma in age. Although some bentonites are reported from this interval in eastern North America, we are reporting the first set of compositional data for a bentonite of this age. Gamma-log correlation identifies a potential minimum distribution area of <2×105 km2 for the K-bentonite, covering part of so

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D'Astous, A. Y., W. W. Ruland, J. R. G. Bruce, J. A. Cherry, and R. W. Gillham. "Fracture effects in the shallow groundwater zone in weathered Sarnia-area clay." Canadian Geotechnical Journal 26, no. 1 (1989): 43–56. http://dx.doi.org/10.1139/t89-005.

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The Sarnia area of southwestern Ontario is underlain by thick deposits of clay-rich glacial till. From ground surface to between 4 and 6 m depth the clay till is fractured, oxidized, and penetrated by root holes. The water table fluctuates seasonally between the ground surface and the bottom of the weathered zone. Water-level response tests in conventional piezometers installed in augered holes in the weathered zone typically provide very low values of hydraulic conductivity (10−7–10−9 cm/s), which are similar to values obtained from the deeper unweathered and unfractured till. The augering pr

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Rowe, R. K., R. W. I. Brachman, M. S. Hosney, W. A. Take, and D. N. Arnepalli. "Insight into hydraulic conductivity testing of geosynthetic clay liners (GCLs) exhumed after 5 and 7 years in a cover." Canadian Geotechnical Journal 54, no. 8 (2017): 1118–38. http://dx.doi.org/10.1139/cgj-2016-0473.

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Four geosynthetic clay liners (GCLs) serving as single liners were exhumed from below 0.7 m of silty sand on a 3:1 (horizontal:vertical) north-facing slope at the QUELTS site in Godfrey, Ontario, after 5 and 7 years. The 300 mm GCL overlaps with 0.4 kg/m supplemental bentonite were all physically intact. The exchangeable bound sodium was completely replaced with divalent cations. The GCL with the smallest needle-punched bundle size (average of 0.7 mm) and percentage area covered by bundles (4%) maintained low hydraulic conductivity (k) when tested under 0.07–1.2 m head with 10 mmol/L CaCl2 sol

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Sharpe, D. R., A. Pugin, S. E. Pullan, and G. Gorrell. "Application of seismic stratigraphy and sedimentology to regional hydrogeological investigations: an example from Oak Ridges Moraine, southern Ontario, Canada." Canadian Geotechnical Journal 40, no. 4 (2003): 711–30. http://dx.doi.org/10.1139/t03-020.

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Hydrogeological models need to be supported by a clear understanding of the subsurface geology to provide effective assessment, flow modelling, or management of groundwater regimes. This paper illustrates how geophysical and sedimentological data can be used to significantly improve watershed-scale hydrostratigraphic models by advancing our understanding of the subsurface through regional hydrogeological investigations in the Greater Toronto Area. The example of a 3 km shallow seismic reflection survey that traverses a buried channel within Bowmanville Creek watershed, Oak Ridges Moraine, Onta

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Ali, Mosaad, Shulin Sun, Wei Qian, et al. "Borehole resistivity and induced polarization tomography at the Canadian Shield for Mineral Exploration in north-western Sudbury." E3S Web of Conferences 168 (2020): 00002. http://dx.doi.org/10.1051/e3sconf/202016800002.

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Mineral exploration in the Canadian shield is a major challenge nowadays. This is because of the thick overburden cover and complex geology. Borehole tomography using resistivity and induced polarization (BHDCIP) method has a big advantage here due to that the data is acquired underneath the cover and data quality, in general, is superior to that acquired at the surface. BHDCIP provides good resistivity and chargeability data, which can identify mineralization easily. In this study, the BHDCIP survey with high-resolution data was carried out to identify mineralization zones in the McCreedy Wes

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Carlson, Anders E., Peter U. Clark, and Steven W. Hostetler. "Comment: Radiocarbon deglaciation chronology of the Thunder Bay, Ontario area and implications for ice sheet retreat patterns." Quaternary Science Reviews 28, no. 23-24 (2009): 2546–47. http://dx.doi.org/10.1016/j.quascirev.2009.05.005.

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Gad, M. A., and I. K. Tsanis. "A GIS methodology for the analysis of weather radar precipitation data." Journal of Hydroinformatics 5, no. 2 (2003): 113–26. http://dx.doi.org/10.2166/hydro.2003.0009.

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A GIS multi-component module was developed within the ArcView GIS environment for processing and analysing weather radar precipitation data. The module is capable of: (a) reading geo-reference radar data and comparing it with rain-gauge network data, (b) estimating the kinematics of rainfall patterns, such as the storm speed and direction, and (c) accumulating radar-derived rainfall depths. By bringing the spatial capabilities of GIS to bear this module can accurately locate rainfall on the ground and can overlay the animated storm on different geographical features of the study area, making t

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Harris, Steven M., Neil R. Thomson, and Kentner S. Novakowski. "Determining the orientation of fracture planes in a weathered clay till using core samples." Canadian Geotechnical Journal 35, no. 2 (1998): 386–94. http://dx.doi.org/10.1139/t98-008.

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A method has been developed to determine fracture plane orientations in clay-rich glacial deposits from core samples obtained from inclined borings. In this method, a portion of each core sample is removed to expose vertical and horizontal surfaces which are used to map each identified fracture plane. An analytical geometry technique is used in conjunction with the mapping data to determine the pole to each fracture plane. These fracture pole data can then be presented on a lower hemisphere equal area projection diagram to indicate preferential fracture plane orientations. The utility of the d

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Morris, T. F., D. Crabtree, R. P. Sage, and S. A. Averill. "Types, abundances and distribution of kimberlite indicator minerals in alluvial sediments, Wawa–Kinniwabi Lake area, Northeastern Ontario: implications for the presence of diamond-bearing kimberlite." Journal of Geochemical Exploration 63, no. 3 (1998): 217–35. http://dx.doi.org/10.1016/s0375-6742(98)00062-4.

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Zhang, Qiong, Changchang Sun, Fei Yan, Chao Lv, and Yunqing Liu. "Leveling airborne geophysical data using a unidirectional variational model." Geoscientific Instrumentation, Methods and Data Systems 11, no. 1 (2022): 183–94. http://dx.doi.org/10.5194/gi-11-183-2022.

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Abstract. Airborne geophysical data leveling is an indispensable step in conventional data processing. Traditional data leveling methods mainly explore the leveling error properties in the time and frequency domain. A new technique is proposed to level airborne geophysical data in view of the image space properties of the leveling error, including directional distribution property and amplitude variety property. This work applied a unidirectional variational model to all the survey data based on the gradient difference between the leveling errors in flight line direction and the tie-line direc

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Peacey, Vicky, Ernest K. Yanful, and Roger Payne. "Field study of geochemistry and solute fluxes in flooded uranium mine tailings." Canadian Geotechnical Journal 39, no. 2 (2002): 357–76. http://dx.doi.org/10.1139/t01-097.

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A geochemical investigation was conducted at the Quirke cell 14 mine waste management area near Elliot Lake, Ontario, Canada, to assess the evolution of water quality of submerged preoxidized uranium mine tailings. Dissolved solids, sulphate, and radium fluxes towards the water cover were calculated using measured solute concentrations, water-cover volumes, and seepage rates for 1993 and 1999. Results indicate that flooding of preoxidized tailings can lead to the initial release of dissolved solids, acidity, and sulphate from the tailings to the overlying water cover. However, the overall impa

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Tetford, Pamela E., and Joseph R. Desloges. "Modelling flood frequency and magnitude in a glacially conditioned, heterogeneous landscape: testing the importance of land cover and land use." Hydrology and Earth System Sciences 27, no. 21 (2023): 3977–98. http://dx.doi.org/10.5194/hess-27-3977-2023.

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Abstract. A reliable flood frequency analysis (FFA) requires selection of an appropriate statistical distribution to model historical streamflow data and, where streamflow data are not available (ungauged sites), a regression-based regional flood frequency analysis (RFFA) often correlates well with downstream channel discharge to drainage area relations. However, the predictive strength of the accepted RFFA relies on an assumption of homogeneous watershed conditions. For glacially conditioned fluvial systems, inherited glacial landforms, sediments, and variable land use can alter flow paths an

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Evans, S. G., and G. R. Brooks. "An earthflow in sensitive Champlain Sea sediments at Lemieux, Ontario, June 20, 1993, and its impact on the South Nation River." Canadian Geotechnical Journal 31, no. 3 (1994): 384–94. http://dx.doi.org/10.1139/t94-046.

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A large (est. volume 2.8 × 106 m3) landslide occurred in sensitive Leda clay on the east bank of the South Nation River at Lemieux, Ontario (45.4°N, 75.06°W), on June 20, 1993. The earthflow involved an area of about 17 ha and retrogressed a total of 680 m, 555 m into the flat plain above the river. No lives were lost but a motorist was injured when he drove into the landslide crater. The 1993 landslide occurred 4.5 km downstream of the well-known 1971 South Nation River landslide along a stretch of river that had experienced other historical landslides in 1895 and 1910. A band of earlier, und

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Quigley, R. M., A. J. Sethi, P. Boonsinsuk, D. E. Sheeran, and R. N. Yong. "Geologic control on soil composition and properties, Lake Ojibway clay plain, Matagami, Quebec." Canadian Geotechnical Journal 22, no. 4 (1985): 491–500. http://dx.doi.org/10.1139/t85-069.

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Varved clays deposited in proglacial Lake Ojibway at Matagami, Quebec, were derived from two source areas: carbonate-deficient, Precambrian crystalline igneous rocks from New Quebec to the east and carbonate-rich Palaeozoic rocks from the James Bay lowlands in Ontario to the west. About 50% of the 12–15 m thick clay section consists of varved clays containing less than 3% carbonate, reflecting the New Quebec source. The remaining 50% of the section consists of two pulses of carbonate-enriched varves (15–30% carbonate) derived from rock flour in two glacial advances known as Cochrane I and Coch

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Rowe, R. Kerry, Chris J. Caers, and Frank Barone. "Laboratory determination of diffusion and distribution coefficients of contaminants using undisturbed clayey soil." Canadian Geotechnical Journal 25, no. 1 (1988): 108–18. http://dx.doi.org/10.1139/t88-011.

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This paper describes a technique for determining the diffusion coefficient and the distribution coefficient for contaminants using saturated, intact (undisturbed) clayey soil samples. The technique is illustrated with reference to a number of laboratory tests involving advective-diffusive migration of potential contaminants through an intact clayey soil from Sarnia, Ontario. An important aspect of the proposed technique is that the mass of contaminant in the system is kept constant and so significant decrease in source leachate concentration occurs during each test. A simple theoretical model

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McNaughton, Kimberly A., and Peter F. Lee. "Water Quality Effects from an Aquaculture Operation in a Meromictic Iron Pit Lake in Northwestern Ontario, Canada." Water Quality Research Journal 45, no. 1 (2010): 13–24. http://dx.doi.org/10.2166/wqrj.2010.003.

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Abstract In 1989, aquaculture for the production of rainbow trout (Oncorhynchus mykiss) was started in the upper depths of the 180-m deep Caland pit lake formed after the flooding of the former Steeprock Iron Mine. After ten years of operation, water quality was shown to be affected by the fish farm as well as proximal waste and the surficial geology of the area. Meromictic conditions occurred in the pit lake with a dichotomy in water quality versus depth. A cluster of parameters (ammonia, total phosphorus, total Kjeldahl nitrogen, dissolved organic carbon, B, pH, dissolved oxygen) were either

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Harvey, Robert Richard, and Edward Arthur McBean. "Comparing the utility of decision trees and support vector machines when planning inspections of linear sewer infrastructure." Journal of Hydroinformatics 16, no. 6 (2014): 1265–79. http://dx.doi.org/10.2166/hydro.2014.007.

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Closed-circuit television inspection technology is traditionally used to identify aging sewer pipes requiring rehabilitation. While these inspections provide essential information on the condition of pipes hidden from day-to-day view, they are expensive and often limited to small portions of an entire sewer system. Municipalities may benefit from utilizing predictive analytics to leverage existing inspection datasets so that reliable predictions of condition are available for pipes that have not yet been inspected. The predictive capabilities of data mining systems, namely support vector machi

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Henriksen, A., P. J. Dillon, and J. Aherne. "Critical loads of acidity for surface waters in south-central Ontario, Canada: regional application of the Steady-State Water Chemistry (SSWC) model." Canadian Journal of Fisheries and Aquatic Sciences 59, no. 8 (2002): 1287–95. http://dx.doi.org/10.1139/f02-092.

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Critical loads of acidity and the amount by which these critical loads are exceeded by atmospheric deposition (termed "exceedances") were estimated for 1469 lakes from five regions in south-central Ontario, Canada, using single lake chemistry measurements and sulphur deposition data for the period 19761999. Based on the Steady-State Water Chemistry (SSWC) model, four of the five regions had low critical loads, which is consistent with the underlying geology (silicate bedrock) and the thin glacial soils in these regions. Sulphur deposition in the study area showed a clear downward trend over t

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Zhdanov, Michael S., Xiaojun Liu, Glenn A. Wilson, and Le Wan. "3D migration for rapid imaging of total-magnetic-intensity data." GEOPHYSICS 77, no. 2 (2012): J1—J5. http://dx.doi.org/10.1190/geo2011-0425.1.

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Three-dimensional potential field migration for rapid imaging of entire total-magnetic-intensity (TMI) surveys is introduced, and real time applications are discussed. Potential field migration is based on a direct integral transformation of the measured TMI data into a 3D susceptibility model, which could be directly used for interpretation or as an a priori model for subsequent regularized inversion. The advantage of migration is that it does not require any a priori information about the type of the sources present, nor does it rely on regularization as per inversion. Migration is very stab

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Lowell, Thomas V., and Timothy G. Fisher. "Reply to comments by Carlson et al., (2009) on “Radiocarbon deglaciation chronology of the Thunder Bay, Ontario area and implications for ice sheet retreat patterns”." Quaternary Science Reviews 28, no. 23-24 (2009): 2548–50. http://dx.doi.org/10.1016/j.quascirev.2009.06.022.

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Sakr, Mohammed, M. Hesham El Naggar, and Moncef Nehdi. "Novel toe driving for thin-walled piles and performance of fiberglass-reinforced polymer (FRP) pile segments." Canadian Geotechnical Journal 41, no. 2 (2004): 313–25. http://dx.doi.org/10.1139/t03-089.

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Despite the rapidly growing use of pile foundations, it is presently difficult to assure the integrity and uniformity of the cross-sectional area of cast-in-place piles when using normal concrete. Cavities and soil encroachments leading to soil pockets can jeopardize their load-bearing capacity. Moreover, corrosion in reinforced concrete and steel shell piles has been very costly, exceeding US$2 billion in annual repair costs in the United States alone. To address these two challenges, extensive research has been underway at the University of Western Ontario to develop novel technology for the

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Fernberg, P. A., C. Samson, D. H. Boteler, L. Trichtchenko, and P. Larocca. "Earth conductivity structures and their effects on geomagnetic induction in pipelines." Annales Geophysicae 25, no. 1 (2007): 207–18. http://dx.doi.org/10.5194/angeo-25-207-2007.

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Abstract. Anomalous, large pipe-to-soil potentials (PSP) have been observed along a natural gas pipeline in eastern Ontario, Canada, where there is a major geological contact between the highly resistive rocks of the Precambrian Shield to the west and the more conductive Paleozoic sediments to the east. This study tested the hypothesis that large variations of PSP are related to lateral changes of Earth conductivity under the pipeline. Concurrent and co-located PSP and magnetotelluric (MT) geophysical data were acquired in the study area. Results from the MT survey were used to model PSP varia

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Scott, J. S., and R. A. Gibb. "Results of geoscience research in the Canadian Nuclear Fuel Waste Management Program: Introduction." Canadian Journal of Earth Sciences 26, no. 2 (1989): 341–44. http://dx.doi.org/10.1139/e89-032.

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Canada, along with other countries that are considering the permanent disposal of high-level radioactive wastes from nuclear power generation, is undertaking a program of research into deep geological disposal. This program, led by Atomic Energy of Canada Limited (AECL) with support from Energy, Mines and Resources Canada, other federal government departments, universities, and industrial consultants, has been in progress since early in 1973. Geoscience research, the subject of this symposium, complements research on fuel waste immobilization to provide the data and information essential to th

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MacCormack, Kelsey, Emmanuelle Arnaud, and Beth L. Parker. "Using a multiple variogram approach to improve the accuracy of subsurface geological models." Canadian Journal of Earth Sciences 55, no. 7 (2018): 786–801. http://dx.doi.org/10.1139/cjes-2016-0112.

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Subsurface geological models are often used to visualize and analyze the nature, geometry, and variability of geologic and hydrogeologic units in the context of groundwater resource studies. The development of three-dimensional (3D) subsurface geological models covering increasingly larger model domains has steadily increased in recent years, in step with the rapid development of computing technology and software, and the increasing need to understand and manage groundwater resources at the regional scale. The models are then used by decision makers to guide activities and policies related to

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You, Chen, Scott Briggs, and Mark E. Orazem. "An Advanced Model for Long-Term Localized Corrosion of Copper." ECS Meeting Abstracts MA2022-02, no. 11 (2022): 714. http://dx.doi.org/10.1149/ma2022-0211714mtgabs.

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The Nuclear Waste Management Organization (NWMO) is responsible for the implementation of the Adaptive Phased Management (APM) plan, the federally-approved plan for the safe long-term management of Canada’s used nuclear fuel.1 Under the APM plan, used nuclear fuel will ultimately be placed within a deep geological repository (DGR) in a suitable host rock formation. Part of evaluating the long-term performance and safety of the repository system is understanding the behavior of the copper-coated container with respect to localized corrosion. Even though localized corrosion is not expected in th

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MacLeod, Josef, Wendel (Bill) Keller, Andrew M. Paterson, Richard D. Dyer, and John M. Gunn. "Scale and watershed features determine lake chemistry patterns across physiographic regions in the far north of Ontario, Canada." Journal of Limnology, November 8, 2016. http://dx.doi.org/10.4081/jlimnol.2016.1553.

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<p>Changes in the far north of Ontario (&gt;50°N latitude), like climate warming and increased industrial development, will have direct effects on watershed characteristics and lakes. To better understand the nature of remote northern lakes that span the Canadian Shield and Hudson Bay Lowlands, and to address the pressing need for limnological data for this vast, little-studied area of Ontario, lake chemistry surveys were conducted during 2011-2012. Lakes at the transition between these physiographic regions displayed highly variable water chemistry, reflecting the peatland landscape

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Formenti, Serena, Alexander Peace, Carolyn Eyles, Rebecca Lee, and John WF Waldron. "Fractures in the Niagara Escarpment in Ontario, Canada: distribution, connectivity, and geohazard implications." Geological Magazine, July 13, 2022, 1–16. http://dx.doi.org/10.1017/s0016756822000462.

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Abstract The Niagara Escarpment is a geological feature located in southern Ontario, Canada, and the northeastern United States, comprising highly fractured sandstone, shale and carbonates deposited during the Ordovician and Silurian periods. Differential erosion of the strata has generated a steep cliff face which bisects the city of Hamilton, Ontario. Geological fractures are widespread in the escarpment and result in the formation of unstable blocks of rock subject to erosion through rockfall. This presents structural stability issues of concern due to the proximity of the escarpment to urb

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