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Examination Of The Role Of Macropores And Subsurface Drainage In The Delivery Of Nitrogen Trioxide-Nitrogen To A Small First-Order Agricultural Stream In Southern Ontario, Abraham House
Theses and Dissertations (Comprehensive)
Agricultural practices may result in nitrate losses, diminished surface water quality and widespread groundwater aquifer contamination. Many works have identified preferential flow through macropores as an important feature that may increase nitrate losses. Subsurface drainage collectors may intercept preferential flow and indicate changing unsaturated/saturated processes. Antecedent conditions are important in determining runoff response. It is unclear how tile drains modify the antecedent soil moisture regime and water tables in near stream areas. Vegetated riparian buffer zones found beetween agricultural fields and watercourses may attenuate nitrate in shallow groundwater pathways. However, little work recognizes the close proximity of buffer strips and …
Spatial And Temporal Patterns Of Fluvial Suspended Sediment Yield From Eastern North America, Catherine Treena Conrad
Spatial And Temporal Patterns Of Fluvial Suspended Sediment Yield From Eastern North America, Catherine Treena Conrad
Theses and Dissertations (Comprehensive)
A knowledge of spatial and temporal patterns of sediment yields and an understanding of the factors that determine those patterns have theoretical, environmental and socio-economic significance. To assess the change in sediment yields (in both space and time) a data base of 193 river gauging sites spanning the eastern provinces of Canada and eastern United States was compiled. The original source of the data was the United States Geological Survey data base (obtained from a Hydrosphere Data Inc. cd-rom) and Environment Canada (HYDAT) data base, which included stream discharge, sediment loads and basin areas, with record lengths of one year …
The Effect Of Rock Creep On The Morphology Of Steep-Sloped Sections Of The Niagara Escarpment (Ontario), John Barlow
The Effect Of Rock Creep On The Morphology Of Steep-Sloped Sections Of The Niagara Escarpment (Ontario), John Barlow
Theses and Dissertations (Comprehensive)
The thesis addresses the post-glacial development of the Niagara Cuesta between Hamilton and Collingwood. Conventional thinking on the escarpment during the Holocene suggests that the present morphology developed rapidly following deglaciation due to periglacial processes (Straw, 1966/Tovell 1992). The disruption of the preglacial drainage pattern by drift has meant the escarpment has not been subject to extensive fluvial action along its base, resulting in an extremely slow rate of retreat (Bird, 1980). The concept that the escarpment is a relict feature therefore pervades the modem literature. The apparent motion of the blocks at the face of the escarpment (Hintz, I997) …