Runoff Process of a Subarctic Canadian Shield Lake Stream System

Title: Runoff Processes of a Subarctic Canadian Shield Lake Stream System, Author: Corrine A. Mielko, Location: Thode Many lake-stream networks consisting of numerous lake basin elements linked by surface flow channels occupy Precambrian Shield and lowland areas in the boreal region. To investigate...

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Main Author: Mielko, Corrine A.
Other Authors: Woo, Ming-ko, Geography and Earth Sciences
Format: Thesis
Language:English
Published: 2006
Subjects:
Online Access:http://hdl.handle.net/11375/21135
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record_format openpolar
spelling ftmcmaster:oai:macsphere.mcmaster.ca:11375/21135 2023-05-15T18:28:16+02:00 Runoff Process of a Subarctic Canadian Shield Lake Stream System Mielko, Corrine A. Woo, Ming-ko Geography and Earth Sciences 2006-09 http://hdl.handle.net/11375/21135 en eng http://hdl.handle.net/11375/21135 Thesis 2006 ftmcmaster 2022-03-22T21:14:14Z Title: Runoff Processes of a Subarctic Canadian Shield Lake Stream System, Author: Corrine A. Mielko, Location: Thode Many lake-stream networks consisting of numerous lake basin elements linked by surface flow channels occupy Precambrian Shield and lowland areas in the boreal region. To investigate the processes causing flow generation and seasonal severance of flow connection in the lake-stream system, a chain of lakes in northern Canada was studied in 2004. Water balance shows that rapid and substantial runoff from the local basin slopes during the snowmelt period led to a rise of lake levels above their outlet elevations to generate outflow. Continued summer evaporation caused draw down of lake storage below the outflow thresholds, represented by the lake outlet elevations. Outflow ceased and the lakes became disconnected. Summer rainfall in a semi-arid environment was insufficient to overcome storage deficit to re-establish flow connectivity among all lakes. Individual lake outflow generation is dependent on the rate of runoff delivery, the initial antecedent storage level with respect to the critical outflow threshold level and the ratio of catchment to lake area. For the drainage system as a whole, streamflow interruption or continuity depends on linkage of its lake-stream sub-units. The principle of fill and spill governs runoff generation and flow connection between the lake elements. This principle is applied to model the flow along a chain of lakes, taking account of antecedent storage in individual lakes, their storage change calculated through water balance and the thresholds to be exceeded for outflows to occur. Thesis Master of Science (MS) Thesis Subarctic MacSphere (McMaster University) Canada Shield Lake ENVELOPE(78.265,78.265,-68.530,-68.530)
institution Open Polar
collection MacSphere (McMaster University)
op_collection_id ftmcmaster
language English
description Title: Runoff Processes of a Subarctic Canadian Shield Lake Stream System, Author: Corrine A. Mielko, Location: Thode Many lake-stream networks consisting of numerous lake basin elements linked by surface flow channels occupy Precambrian Shield and lowland areas in the boreal region. To investigate the processes causing flow generation and seasonal severance of flow connection in the lake-stream system, a chain of lakes in northern Canada was studied in 2004. Water balance shows that rapid and substantial runoff from the local basin slopes during the snowmelt period led to a rise of lake levels above their outlet elevations to generate outflow. Continued summer evaporation caused draw down of lake storage below the outflow thresholds, represented by the lake outlet elevations. Outflow ceased and the lakes became disconnected. Summer rainfall in a semi-arid environment was insufficient to overcome storage deficit to re-establish flow connectivity among all lakes. Individual lake outflow generation is dependent on the rate of runoff delivery, the initial antecedent storage level with respect to the critical outflow threshold level and the ratio of catchment to lake area. For the drainage system as a whole, streamflow interruption or continuity depends on linkage of its lake-stream sub-units. The principle of fill and spill governs runoff generation and flow connection between the lake elements. This principle is applied to model the flow along a chain of lakes, taking account of antecedent storage in individual lakes, their storage change calculated through water balance and the thresholds to be exceeded for outflows to occur. Thesis Master of Science (MS)
author2 Woo, Ming-ko
Geography and Earth Sciences
format Thesis
author Mielko, Corrine A.
spellingShingle Mielko, Corrine A.
Runoff Process of a Subarctic Canadian Shield Lake Stream System
author_facet Mielko, Corrine A.
author_sort Mielko, Corrine A.
title Runoff Process of a Subarctic Canadian Shield Lake Stream System
title_short Runoff Process of a Subarctic Canadian Shield Lake Stream System
title_full Runoff Process of a Subarctic Canadian Shield Lake Stream System
title_fullStr Runoff Process of a Subarctic Canadian Shield Lake Stream System
title_full_unstemmed Runoff Process of a Subarctic Canadian Shield Lake Stream System
title_sort runoff process of a subarctic canadian shield lake stream system
publishDate 2006
url http://hdl.handle.net/11375/21135
long_lat ENVELOPE(78.265,78.265,-68.530,-68.530)
geographic Canada
Shield Lake
geographic_facet Canada
Shield Lake
genre Subarctic
genre_facet Subarctic
op_relation http://hdl.handle.net/11375/21135
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