Riverbank characteristics and stability along the upper estuarine reaches of the Moose River, northern Ontario
The riverbanks within the upper reaches of the Moose River estuary have been analysed to determine their stratigraphy, geotechnical properties and stability. Rotational slumps, translational slides, block falls and earth flows are the forms of mass movement identified within the study area. Rotation...
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University of Guelph
2000
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ftunivguelph:oai:atrium.lib.uoguelph.ca:10214/19704 2023-11-05T03:43:27+01:00 Riverbank characteristics and stability along the upper estuarine reaches of the Moose River, northern Ontario Dumbrell, Melissa J. Martini, I.P. 2000 application/pdf https://hdl.handle.net/10214/19704 en eng University of Guelph https://hdl.handle.net/10214/19704 All items in the Atrium are protected by copyright with all rights reserved unless otherwise indicated. riverbank characteristics stability upper reaches estuary Moose River northern Ontario Thesis 2000 ftunivguelph 2023-10-08T06:12:37Z The riverbanks within the upper reaches of the Moose River estuary have been analysed to determine their stratigraphy, geotechnical properties and stability. Rotational slumps, translational slides, block falls and earth flows are the forms of mass movement identified within the study area. Rotational slumps are the most common failure type and are particularly concentrated along the north mainland banks characterized by a basal glaciomarine unit (Tyrrell Sea clay) overlain by a thick silt unit and capped by a thin organic soil layer. The rotational slumps commonly occur in the spring and are associated with the sensitive basal stratigraphic unit (Tyrrell Sea clay). The tidal inundation and exposure of the clay twice a day encourages instability by promoting cracking which weakens the unit. Undercutting by the river flow and the scouring by river ice during spring breakup further destabilizes the bank. Coupled with an increase in pore-water pressure during snowmelt (thereby decreasing the shear strength of the sediment), and the rapid drawdown effect following the spring freshet, particularly after an ice jam, a loss of sediment strength and change in support by the river results, and large-scale failures occur. Thesis Moose River University of Guelph: DSpace digital archive |
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Open Polar |
collection |
University of Guelph: DSpace digital archive |
op_collection_id |
ftunivguelph |
language |
English |
topic |
riverbank characteristics stability upper reaches estuary Moose River northern Ontario |
spellingShingle |
riverbank characteristics stability upper reaches estuary Moose River northern Ontario Dumbrell, Melissa J. Riverbank characteristics and stability along the upper estuarine reaches of the Moose River, northern Ontario |
topic_facet |
riverbank characteristics stability upper reaches estuary Moose River northern Ontario |
description |
The riverbanks within the upper reaches of the Moose River estuary have been analysed to determine their stratigraphy, geotechnical properties and stability. Rotational slumps, translational slides, block falls and earth flows are the forms of mass movement identified within the study area. Rotational slumps are the most common failure type and are particularly concentrated along the north mainland banks characterized by a basal glaciomarine unit (Tyrrell Sea clay) overlain by a thick silt unit and capped by a thin organic soil layer. The rotational slumps commonly occur in the spring and are associated with the sensitive basal stratigraphic unit (Tyrrell Sea clay). The tidal inundation and exposure of the clay twice a day encourages instability by promoting cracking which weakens the unit. Undercutting by the river flow and the scouring by river ice during spring breakup further destabilizes the bank. Coupled with an increase in pore-water pressure during snowmelt (thereby decreasing the shear strength of the sediment), and the rapid drawdown effect following the spring freshet, particularly after an ice jam, a loss of sediment strength and change in support by the river results, and large-scale failures occur. |
author2 |
Martini, I.P. |
format |
Thesis |
author |
Dumbrell, Melissa J. |
author_facet |
Dumbrell, Melissa J. |
author_sort |
Dumbrell, Melissa J. |
title |
Riverbank characteristics and stability along the upper estuarine reaches of the Moose River, northern Ontario |
title_short |
Riverbank characteristics and stability along the upper estuarine reaches of the Moose River, northern Ontario |
title_full |
Riverbank characteristics and stability along the upper estuarine reaches of the Moose River, northern Ontario |
title_fullStr |
Riverbank characteristics and stability along the upper estuarine reaches of the Moose River, northern Ontario |
title_full_unstemmed |
Riverbank characteristics and stability along the upper estuarine reaches of the Moose River, northern Ontario |
title_sort |
riverbank characteristics and stability along the upper estuarine reaches of the moose river, northern ontario |
publisher |
University of Guelph |
publishDate |
2000 |
url |
https://hdl.handle.net/10214/19704 |
genre |
Moose River |
genre_facet |
Moose River |
op_relation |
https://hdl.handle.net/10214/19704 |
op_rights |
All items in the Atrium are protected by copyright with all rights reserved unless otherwise indicated. |
_version_ |
1781701615988768768 |