CGRG Bibliography of Canadian Geomorphology
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Author : Clague, J.J.; Heideman, M.; and Menounos, B.
Date : 2008.
Title : Analysis of Lillooet River flooding based on the record of varves in Lillooet Lake.
Publication : E0S Transactions. American Geophysical Union.
Issue : 90(52)
Page(s) : Fall Meeting Supplement. Abstract U41A-0003.
Abstract
The incidence of severe floods in the Lillooet River valley, in the southern Coast Mountains of British Columbia approximately 160 km north of Vancouver, has increased in the past several decades. This research aims to extend the historical flood record using a proxy record of varved sediments recovered from Lillooet Lake, into which Lillooet River flows. Twelve vibracores and percussion cores up to 10.9 m long provide a record of sedimentation that spans approximately the past 650 years. Unusually thick varves mark known floods in 1980, 1984, 1991, and 2003. Older, prehistoric floods will be inferred using varve thickness and other characteristics of historical flood layers. A frequency-magnitude relationship will be established for the period of the varve record. The sediment record will also be interrogated for possible relations with late Holocene climate change in northwest North America. The extended flood record and inundation modelling of Lillooet valley will help local communities establish a more informed management plan for future development on the Lillooet River floodplain. Additionally, the research will provide a better understanding of the climate factors (e.g. PDO, ENSO) that affect flooding in southwest British Columbia.
Bibliography of Canadian Geomorphology