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Experiments on constriction-pool-widening channel morphology in bedrock canyons

Resource type
Thesis type
(Thesis) M.Sc.
Date created
2023-03-29
Authors/Contributors
Author: Kusack, Kyle
Abstract
Bedrock rivers often alternate between relatively wide alluvial reaches and conspicuously narrow, deeply incised bedrock reaches (canyons) where there exists a constriction-pool-widening (CPW) morphology that consists of deep scour pools that form downstream of where the river is constricted laterally within a canyon, then widens downstream of the pool. I hypothesize that CPW morphology is forced by initial constriction of the channel by bedrock, but that subsequent CPWs within a canyon are autogenic. This hypothesis was tested experimentally in a flume channel, modelled after the Fraser Canyons, British Columbia, with bed and banks made from erodible foam simulating bedrock that is eroded by transported gravel. My results show the first CPW in a series emerges due to structural controls on river width, forming a pool at the entrance to the canyon that widens downstream. The results demonstrate that once formed, a CPW can then self-propagate allowing for the autogenic formation of additional CPWs downstream.
Document
Extent
72 pages.
Identifier
etd22368
Copyright statement
Copyright is held by the author(s).
Permissions
This thesis may be printed or downloaded for non-commercial research and scholarly purposes.
Supervisor or Senior Supervisor
Thesis advisor: Venditti, Jeremy
Language
English
Member of collection
Download file Size
etd22368.pdf 25.24 MB

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