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Storm surges and erosion of coastal dunes between 1957 and 1988 near Dunkerque (France), southwestern North Sea
Vasseur, B.; Hequette, A. (2000). Storm surges and erosion of coastal dunes between 1957 and 1988 near Dunkerque (France), southwestern North Sea, in: Pye, K. et al. (Ed.) Coastal and estuarine environments: sedimentology, geomorphology and geoarchaeology. Geological Society Special Publication, 175: pp. 99-107
In: Pye, K.; Allen, J.R.L. (Ed.) (2000). Coastal and estuarine environments: sedimentology, geomorphology and geoarchaeology Geological Society Special Publication, 175 The Geological Society: London. ISBN 1-86239-070-3. 435 pp., more
In: Hartley, A.J. et al. (Ed.) Geological Society Special Publication. Geological Society of London: Oxford; London; Edinburgh; Boston, Mass.; Carlton, Vic.. ISSN 0305-8719, more
Peer reviewed article  

Available in  Authors 
    VLIZ: Geology and Geophysics [5909]
Document type: Conference paper

Keywords
    Marine; Brackish water

Authors  Top 
  • Vasseur, B.
  • Hequette, A.

Abstract
    The comparison of aerial photographs of eroding coastal dunes located between Dunkerque (Northern France) and the Belgium border revealed that the retreat rate of the dune front increased between 1957 and 1988. Analyses of hourly water levels from the Dunkerque Harbour tide gauge showed an increase in the frequency of high water levels associated with storm surges during the same period. Significant wave heights that could be generated during these high water level events were computed according to a wave hindcast model and using wind data collected at Dunkerque. These analyses show an increase in storm magnitude and frequency during the last two decades of the study period, and suggest a strong relationship between dune front erosion and frequency of storm surge conditions. Since relative sea-Ievel is rising in the southern North Sea, coastal dunes will probably be more frequently reached by storm waves in the future. Consequently, more severe coastal dune erosion may take place during the next decades, increasing the risk of flooding of coastal lowlands.

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