Sedimentary processes in large, regulated river systems in the Canadian subarctic
The goal of this thesis is to develop an improved understanding of sedimentary processes along the Nelson River system in the subarctic region of Canada. Sediment sources and transport dynamics in Lake Winnipeg, the Upper Nelson River (UNR) – between Lake Winnipeg and Split Lake – as well as the Bur...
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Language: | English |
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Online Access: | http://hdl.handle.net/1993/37133 |
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ftunivmanitoba:oai:mspace.lib.umanitoba.ca:1993/37133 2023-08-27T04:09:53+02:00 Sedimentary processes in large, regulated river systems in the Canadian subarctic Goharrokhi, Masoud Farenhorst, Annemieke (Soil Science) Clark, Shawn (Civil Engineering) Stone, Mike (Geography and Environmental Management, University of Waterloo) Lobb, David A. Owens, Philip N. 2022-12-15T19:34:27Z application/pdf http://hdl.handle.net/1993/37133 eng eng http://hdl.handle.net/1993/37133 open access Climate change Human-induced environmental changes Sediment budget Sedimentation dynamics Sediment disconnectivity Sediment fingerprinting Lake Winnipeg Nelson River Split Lake doctoral thesis 2022 ftunivmanitoba 2023-08-06T17:37:46Z The goal of this thesis is to develop an improved understanding of sedimentary processes along the Nelson River system in the subarctic region of Canada. Sediment sources and transport dynamics in Lake Winnipeg, the Upper Nelson River (UNR) – between Lake Winnipeg and Split Lake – as well as the Burntwood River (BR) – the major tributary of the Nelson River in the subarctic region – were investigated. The properties of Lake Winnipeg’s bottom sediment and the lake’s total sediment budget were used to provide a better understanding of: a) the sedimentation dynamics in Lake Winnipeg; and b) its role in sediment transport in the Nelson River system. The sediment source fingerprinting technique and long-term record of sediment load data on the BR and the UNR were used for separating the importance of climate change from human-induced environmental changes on these two regulated rivers. Moreover, the influence of Split Lake on the downstream delivery of sediment to the Lower Nelson River and Hudson Bay was investigated by developing the sediment budget for this riverine lake. In addition, the collection of a representative sample of ambient suspended sediment using a well-established time-integrated sampler and two adapted discrete samplers was investigated. The performance of these samplers was examined in a controlled laboratory and under field conditions. Assessing these samplers was conducted to determine the most suitable device to collect representative bulk samples from the Nelson River system. The results show that the sediment load derived from the prairies area is sequestered in Lake Winnipeg, along with nutrients and contaminants bound to them. Another key finding was that sediment derived from bluff erosion on the northern shore of the lake is the major source for sediment being exported in the lake’s outflow. This thesis also found that the UNR is characterized by increases in sediment loading as a result of climate change. However, in the BR, cross-watershed water diversion caused a seven-fold increase ... Doctoral or Postdoctoral Thesis Hudson Bay Subarctic MSpace at the University of Manitoba Hudson Bay Canada Hudson Burntwood River ENVELOPE(-96.575,-96.575,56.139,56.139) |
institution |
Open Polar |
collection |
MSpace at the University of Manitoba |
op_collection_id |
ftunivmanitoba |
language |
English |
topic |
Climate change Human-induced environmental changes Sediment budget Sedimentation dynamics Sediment disconnectivity Sediment fingerprinting Lake Winnipeg Nelson River Split Lake |
spellingShingle |
Climate change Human-induced environmental changes Sediment budget Sedimentation dynamics Sediment disconnectivity Sediment fingerprinting Lake Winnipeg Nelson River Split Lake Goharrokhi, Masoud Sedimentary processes in large, regulated river systems in the Canadian subarctic |
topic_facet |
Climate change Human-induced environmental changes Sediment budget Sedimentation dynamics Sediment disconnectivity Sediment fingerprinting Lake Winnipeg Nelson River Split Lake |
description |
The goal of this thesis is to develop an improved understanding of sedimentary processes along the Nelson River system in the subarctic region of Canada. Sediment sources and transport dynamics in Lake Winnipeg, the Upper Nelson River (UNR) – between Lake Winnipeg and Split Lake – as well as the Burntwood River (BR) – the major tributary of the Nelson River in the subarctic region – were investigated. The properties of Lake Winnipeg’s bottom sediment and the lake’s total sediment budget were used to provide a better understanding of: a) the sedimentation dynamics in Lake Winnipeg; and b) its role in sediment transport in the Nelson River system. The sediment source fingerprinting technique and long-term record of sediment load data on the BR and the UNR were used for separating the importance of climate change from human-induced environmental changes on these two regulated rivers. Moreover, the influence of Split Lake on the downstream delivery of sediment to the Lower Nelson River and Hudson Bay was investigated by developing the sediment budget for this riverine lake. In addition, the collection of a representative sample of ambient suspended sediment using a well-established time-integrated sampler and two adapted discrete samplers was investigated. The performance of these samplers was examined in a controlled laboratory and under field conditions. Assessing these samplers was conducted to determine the most suitable device to collect representative bulk samples from the Nelson River system. The results show that the sediment load derived from the prairies area is sequestered in Lake Winnipeg, along with nutrients and contaminants bound to them. Another key finding was that sediment derived from bluff erosion on the northern shore of the lake is the major source for sediment being exported in the lake’s outflow. This thesis also found that the UNR is characterized by increases in sediment loading as a result of climate change. However, in the BR, cross-watershed water diversion caused a seven-fold increase ... |
author2 |
Farenhorst, Annemieke (Soil Science) Clark, Shawn (Civil Engineering) Stone, Mike (Geography and Environmental Management, University of Waterloo) Lobb, David A. Owens, Philip N. |
format |
Doctoral or Postdoctoral Thesis |
author |
Goharrokhi, Masoud |
author_facet |
Goharrokhi, Masoud |
author_sort |
Goharrokhi, Masoud |
title |
Sedimentary processes in large, regulated river systems in the Canadian subarctic |
title_short |
Sedimentary processes in large, regulated river systems in the Canadian subarctic |
title_full |
Sedimentary processes in large, regulated river systems in the Canadian subarctic |
title_fullStr |
Sedimentary processes in large, regulated river systems in the Canadian subarctic |
title_full_unstemmed |
Sedimentary processes in large, regulated river systems in the Canadian subarctic |
title_sort |
sedimentary processes in large, regulated river systems in the canadian subarctic |
publishDate |
2022 |
url |
http://hdl.handle.net/1993/37133 |
long_lat |
ENVELOPE(-96.575,-96.575,56.139,56.139) |
geographic |
Hudson Bay Canada Hudson Burntwood River |
geographic_facet |
Hudson Bay Canada Hudson Burntwood River |
genre |
Hudson Bay Subarctic |
genre_facet |
Hudson Bay Subarctic |
op_relation |
http://hdl.handle.net/1993/37133 |
op_rights |
open access |
_version_ |
1775351564217614336 |