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Journal articles on the topic 'Geology – Ontario – Batchawana Area'

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Published: 4 June 2021

Last updated: 1 February 2022

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1

Kelso, J. R. M. "Fish Community Structure, Biomass, and Production in the Turkey Lakes Watershed, Ontario." Canadian Journal of Fisheries and Aquatic Sciences 45, S1 (1988): s115—s120. http://dx.doi.org/10.1139/f88-275.

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The Turkey Lakes Watershed contains four lakes, and the headwater lake (Batchawana Lake) consists of two distinct basins, neither of which supports a native, reproducing fish stock. Fish biomass varied by a factor of 3.3 among the other three lakes in the watershed. Fish flesh production varied by a factor of only 1.5 in the system. Salmonid and small cyprinid contribution to biomass and production increased with progression downstream. Both fish biomass and production per unit surface area decreased with increasing lake depth. The fish biomass and production in the watershed was strongly infl

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2

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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3

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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4

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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5

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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6

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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7

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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8

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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9

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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10

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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11

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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12

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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13

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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14

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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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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16

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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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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18

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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19

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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20

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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21

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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22

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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23

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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24

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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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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26

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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27

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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28

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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29

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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30

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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31

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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33

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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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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35

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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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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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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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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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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Sarkar, Grytan, and Abouzar Sadrekarimi. "Cyclic Shearing Behavior and Dynamic Characteristics of a Fibrous Peat." Canadian Geotechnical Journal, August 5, 2021. http://dx.doi.org/10.1139/cgj-2020-0516.

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Cyclic shearing behavior, dynamic characteristics, and post-cyclic volume change of a peat sublayer from the Port Lands area of Toronto (Ontario, Canada) are investigated in this study. Laboratory specimens are trimmed from block samples collected from a depth of about 4.0 to 4.5 m. Constant-volume cyclic direct simple shear tests indicate an initial reduction of effective stress with number of stress cycles. However, the corresponding excess pore pressure ratios do not exceed 60%, indicating a cyclic mobility behavior in the peat specimens. Maximum shear moduli of the peat samples are also de

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Naprstek, Tomas, and Richard Smith. "Convolution Neural Networks Applied to the Interpretation of Lineaments in Aeromagnetic Data." GEOPHYSICS, September 22, 2021, 1–50. http://dx.doi.org/10.1190/geo2020-0779.1.

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Parameter estimation in aeromagnetics is an important tool for geological interpretation. Due to aeromagnetic data being highly prevalent around the world, it can often be used to assist in understanding the geology of an area as a whole, or for locating potential areas of further investigation for mineral exploration. Methods that automatically provide information such as the location and depth to the source of anomalies are useful to the interpretation, particularly in areas where a large number of anomalies exist. Unfortunately, many of the current methods rely on high-order derivatives, an

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