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| Titel |
Tide-surge interaction in the English Channel |
| VerfasserIn |
D. Idier, F. Dumas, H. Müller |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1561-8633
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| Digitales Dokument |
URL |
| Erschienen |
In: Natural Hazards and Earth System Science ; 12, no. 12 ; Nr. 12, no. 12 (2012-12-19), S.3709-3718 |
| Datensatznummer |
250011261
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| Publikation (Nr.) |
 copernicus.org/nhess-12-3709-2012.pdf |
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| Zusammenfassung |
| The English Channel is characterised by strong tidal currents and a wide
tidal range, such that their influence on surges is expected to be
non-negligible. In order to better assess storm surges in this zone,
tide-surge interactions are investigated. A preliminary data analysis on
hourly surges indicates some preferential times of occurrence of large storm
surges at rising tide, especially in Dunkerque. To examine this further, a
numerical modelling approach is chosen, based on the 2DH shallow-water model
(MARS). The surges are computed both with and without tide interaction. For
the two selected events (the November 2007 North Sea and March 2008 Atlantic
storms), it appears that the instantaneous tide-surge interaction is seen to
be non-negligible in the eastern half of the English Channel, reaching values
of 74 cm (i.e. 50% of the same event maximal storm surge) in the Dover
Strait for the studied cases. This interaction decreases in westerly
direction. In the risk-analysis community in France, extreme water levels
have been determined assuming skew surges and tide as independent. The same
hydrodynamic model is used to investigate this dependence in the English
Channel. Simple computations are performed with the same meteorological
forcing, while varying the tidal amplitude, and the skew surge differences
DSS are analysed. Skew surges appear to be tide-dependent, with
negligible values of DSS (<0.05 m) over a large portion of the
English Channel, although reaching several tens of centimetres in some
locations (e.g. the Isle of Wight and Dover Strait). |
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