Subsurface sediment profiles below Point Pelee: indicators of postglacial evolution in western Lake Erie

Coakley, John P.; Crowe, Allan S.; Huddart, Patrice A.

doi:10.1139/cjes-35-1-88

Cited by 11 publications

(5 citation statements)

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“…Counter rotating currents along the east and west sides of the foreland have caused erosion and deposition, which led to the formation of the two barrier bars converging at the south. The western barrier bar comprises a shoreface sand and gravel 2 to 7 m in thickness and is exposed along the present day shore (Coakley et al 1998). Inland from the beach, a well-sorted, medium-grained, aeolian (dune) sand has derived from, and overlies, the shoreface sand, varying in thickness from 0 to 8 m (Coakley et al 1998).…”

Section: Setting Of Point Pelee National Parkmentioning

confidence: 99%

“…The western barrier bar comprises a shoreface sand and gravel 2 to 7 m in thickness and is exposed along the present day shore (Coakley et al 1998). Inland from the beach, a well-sorted, medium-grained, aeolian (dune) sand has derived from, and overlies, the shoreface sand, varying in thickness from 0 to 8 m (Coakley et al 1998). Sand dunes up to 10 m in elevation have developed within the northern and central portions of the western barrier bar.…”

Section: Setting Of Point Pelee National Parkmentioning

confidence: 99%

“…The location of the marsh-barrier bar interface is variable due to fluctuations in the surface elevation of the marsh and low surface elevations of the western barrier bar towards the south and east (Coakley et al 1998). As the elevation of the surface of the marsh fluctuates, near shore regions are often flooded and contribute to organic deposits within the aeolian sand.…”

Section: Setting Of Point Pelee National Parkmentioning

confidence: 99%

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Distribution and persistence of DDT in soil at a sand dune-marsh environment: Point Pelee, Ontario, Canada

Crowe¹,

Smith²

2007

Can. J. Soil. Sci.

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Crowe, A. S. and Smith, J. E. 2007. Distribution and persistence of DDT in soil at a sand dune-marsh environment: Point Pelee, Ontario, Canada. Can. J. Soil Sci. 87: 315-327. DDT was applied at Point Pelee, Ontario, Canada, between 1948 and1970 for mosquito control in recreational areas and pest control in former agricultural areas. Recent soil sampling programs produced 275 analyses enabling a statistical comparison of DDT concentrations with land use areas, soil conditions, and hydrologic characteristics. Concentrations of ΣDDT ranged over several orders of magnitude, with the highest concentrations (maximum 316 000 ng g -1 ) in former agricultural areas and the lowest concentrations in the natural sand dunes (maximum of 116 ng g -1 ). DDT is undergoing degradation at Point Pelee along two pathways. DDT is transformed aerobically to DDE within the sandy soils exhibiting average %DDT, %DDE and %DDD of 40%, 55%, and 5% of ΣDDT, respectively. DDT is transformed anaerobically to DDD and DDE within the marsh and flooded soils averaging 14% DDT, 44% DDE, and 42% DDD, respectively. The half-lives for the transformation of DDT to DDE within the well-drained and aerobic sandy soils at Point Pelee are highly variable and were estimated to range from 20 to 50 yr. Given the high concentrations of ΣDDT at Point Pelee and the long half-life, it is expected that DDT will remain at concentrations of concern for many decades. , on a appliqué du DDT à la pointe Pelée, une région de l'Ontario (Canada), pour lutter contre les moustiques dans les aires récréatives et pour combattre les parasites dans les anciennes zones agricoles. De récents programmes d'échantillonnage du sol ont permis 275 analyses qui devaient servir à comparer la concentration de DDT selon la vocation des terres, l'état du sol et l'hydrologie. La concentration de ΣDDT varie de plusieurs ordres de grandeur, la plus élevée (maximum de 316 000 ng/g) ayant été observée dans les vieilles zones agricoles et la plus faible, dans les dunes de sable naturelles (maximum de 116 ng/g). À la pointe Pelée, le DDT se dégrade de deux façons. Il se transforme de manière aérobie en DDE dans les sols sablonneux, avec une moyenne pour le DDT, le DDE et le DDD de 40 %, 55 % et 5 % du ΣDDT, respectivement, et de manière anaérobie en DDD et DDE dans les marais et les sols inondés avec une moyenne de 14 % de DDT, de 44 % de DDE et de 42 % de DDD, respectivement. La demi-vie nécessaire à la transformation du DDT en DDE dans les sols bien drainés et sablonneux aérobies de la pointe Pelée varie considérablement, avec une fourchette estimative de 20 à 50 ans. Étant donné la forte concentration de ΣDDT à la pointe Pelée et la longue demi-vie du DDT, on s'attend à ce que la concentration de ce pesticide demeure problématique pendant de nombreuses décennies encore.

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Section: Setting Of Point Pelee National Parkmentioning

confidence: 99%

Section: Setting Of Point Pelee National Parkmentioning

confidence: 99%

Section: Setting Of Point Pelee National Parkmentioning

confidence: 99%

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Distribution and persistence of DDT in soil at a sand dune-marsh environment: Point Pelee, Ontario, Canada

Crowe¹,

Smith²

2007

Can. J. Soil. Sci.

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“…It exists within a quasi-symmetrical cuspate foreland that projects ~15 km into Lake Erie. Sand ridges enclosing the marsh formed ~4000 years B.P from remnants of the Pelee-Lorain moraine during a progressive rise of lake levels in the western and central basins of Lake Erie (Coakley, 1976;Coakley et al, 1998). Marsh waters are considered to be isolated from those of Lake Erie, except during major storm events (Bayly and O'Neill, 1971;Huddart et al, 1999).…”

Section: Introductionmentioning

confidence: 99%

Carbon-isotope ratios and carbon, nitrogen and sulfur abundances in flora and soil organic matter from a temperate-zone bog and marsh.

Hornibrook¹,

Longstaffe²,

Fyfe³

et al. 2000

Geochem. J.

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“…A subsequent rise in water levels in the lake resulted in reworking of the moraine sediments and long-shore deposition of sands that formed the barrier bars and Point Pelee's distinctive triangular shape. As shown in Figure 2, the barrier bars are composed primarily of shoreface and aeolian sands (Coakley et al, 1998). A 1 to 7 m thick shoreface sand extends across the barrier bars but is exposed only along the shoreline of Lake Erie.…”

Section: Groundwater Flow and Contaminant Transport At Point Peleementioning

confidence: 99%

Numerical modelling of groundwater flow and contaminant transport to Point Pelee marsh, Ontario, Canada

Crowe

Shikaze²,

Ptacek

2004

Hydrological Processes

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Abstract:A numerical model was developed for simulating groundwater-wetland interactions and contaminant transport. The model calculates transient hydraulic head and a transient free surface in a two-dimensional, heterogeneous domain, with variable and transient boundary conditions (infiltration, evapotranspiration, surface water), and water and contaminant fluxes across the aquifer-wetland interface. Contaminant transport is also simulated, with contaminant sources located at the free surface, wetland, or within the saturated domain. The model was applied to assess groundwater-wetland interactions and the transport of septic-system-derived contaminants at Point Pelee, Ontario, Canada. The model successfully simulated the field observations of groundwater flow and contaminant plumes. Where the barrier bar is narrow, the seasonal reversal in the direction of groundwater flow is caused by differences in the elevation of the water surface of Lake Erie and that of the marsh. This, in turn, induces the contaminants to oscillate between movement towards the lake during the winter and towards the marsh during the summer. Hence, contaminant plumes are bimodal in shape. Where the barrier bar becomes wider, the lake and the marsh have less effect, and hence contaminants move in one direction, along the principal direction of groundwater flow towards the marsh.

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Subsurface sediment profiles below Point Pelee: indicators of postglacial evolution in western Lake Erie

Cited by 11 publications

References 0 publications

Distribution and persistence of DDT in soil at a sand dune-marsh environment: Point Pelee, Ontario, Canada

Distribution and persistence of DDT in soil at a sand dune-marsh environment: Point Pelee, Ontario, Canada

Carbon-isotope ratios and carbon, nitrogen and sulfur abundances in flora and soil organic matter from a temperate-zone bog and marsh.

Numerical modelling of groundwater flow and contaminant transport to Point Pelee marsh, Ontario, Canada

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