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(Article of periodic en Anglais - 2013)

Document title

Erosive water level regime and climatic variability forcing of beach–dune systems on south-western Vancouver Island, British Columbia, Canada

Authors(s) and Affiliation(s)

HEATHFIELD D.K. (1) ; WALKER I.J. (1) ; ATKINSON D.E. (1) ;
(1) Coastal Erosion and Dune Dynamics (CEDD) Laboratory, Dept. of Geography, Univ., Victoria, CANADA

Abstract

Increases of extreme water levels and storm surges are correlated with known indices of climatic variability (CV), including the El Niño Southern Oscillation (ENSO) and the Pacific Decadal Oscillation (PDO), along the British Columbia coast. Since a shift to a positive PDO regime in 1977, the effects of ENSO events have been more frequent. Teleconnected impacts include more frequent storms, higher surges, and enhanced coastal erosion. As a first step in exploring the interactions between ocean-atmosphere forcing and beach-dune responses, this paper assembles the historic erosive total water level (TWL) regime and explores relations with observed high magnitude storms that have occurred in the Tofino-Ucluelet region (Wickaninnish Bay) on the west coast of Vancouver Island. Extreme events where TWL exceeded an erosional threshold (i.e. elevation of the beach–foredune junction) are examined to identify dominant forcing mechanisms and to classify a regime that describes erosive events driven principally by wave conditions, followed by surge, and tidal effects. Furthermore, teleconnections between regional CV phenomena, extreme storm events and, by association, coastal erosion, are explored.

Source

Article of periodic

published at : Earth surface processes and landforms / ISSN 0197-9337 / CODEN ESPLDB

Editor : Wiley, Chichester - ROYAUME-UNI (1981)

Millesime : 2013, vol. 38, no7 [pp. 751-762]

Bibliographic references : 1 p.

Collation : 9 fig., 3 tabl.

Language

Anglais

INIST-CNRS, Cote INIST : 17355

Digital Object Identifier

Go to electronic document thanks to its DOI : doi:10.1002/esp.3350

Tous droits réservés © Prodig - Bibliographie Géographique Internationale (BGI), 2014
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