CGRG Bibliography of Canadian Geomorphology
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Author : Fuller, T.
Date : 2006.
Title : Hydrology and geomorphology of Bella Coola Valley, British Columbia aggrading channels on alluvial fans and their impact on flood protection – problems and solutions.
Publication : Annual Meeting, Western Division of the Canadian Association of Geographers, March 10-11, 2006. Thompson Rivers University, Kamloops, British Columbia.
Issue : Abstract Volume.
Page(s) : 10.
Abstract
Historic flooding of Bella Coola valley, central coast of British Columbia, has resulted in construction of diking systems and riprap to protect private property, homes, and infrastructure. The valley is part of a fjord in the Coast Mountains which has numerous tributary fans with the Bella Coola River as the mainstem stream. The communities of Bella Coola and Hagensborg are situated in hazardous areas with respect to flooding and channel avulsion. There is a need to determine magnitude and frequency of bedload deposition impacting alluvial fans in this valley and others in the interior of British Columbia. Sediment accumulations within the channel systems in already diked streams has led to perched channel deposits which are now rising to the levels of flood protection afforded by the dike crests. The risk of flooding is now greater in an area that can become isolated easily. One solution is to remove bedload material periodically to restore freeboard on dike crests. This has been accomplished recently on one stream, Nooklikonnik Creek, with major excavation work done in November and early December, 2005. Problems associated with bedload removal include disruption of the aquatic ecosystem, fish habitat, spawning beds and vegetation changes. A systematic team effort by a number of agencies was used to decide on methods to address these problems.
Bibliography of Canadian Geomorphology