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Title: Slide show of tidal bores (Mascarets) in France

Description: A tidal bore is a series of waves propagating upstream as the tidal flow turns to rising. It forms during spring tide conditions when the tidal range exceeds 4 to 6 m and the flood tide is confined to a narrow funnelled estuary. The existence is based upon a fragile hydrodynamic balance between the tidal amplitude (marnage), the freshwater river flow conditions and the river channel bathymetry, and it is shown that this balance may be easily disturbed by changes in boundary conditions and freshwater inflow. Although the Seine River no longer has its tidal bore, more than of dozen of estuaries are affected by tidal bores in France alone. Herein the author shares his enthusiasm and passion for tidal bores by documenting several tidal bores in France with photographic observations. More than 65 photographs are presented in this slide show that is supported by the audio-sound of the tidal bore of the See River in the Baie du Mont Saint Michel.

Credits: Hubert Chanson

References: [1] CHANSON, H. (2008). "Photographic Observations of Tidal Bores (Mascarets) in France." Hydraulic Model Report No. CH71/08, Div. of Civil Engineering, The University of Queensland, Brisbane, Australia, 104 pages, 1 movie and 2 audio files (ISBN 9781864999303) {}

[2] KOCH, C., and CHANSON, H. (2008). "Turbulent Mixing beneath an Undular Bore Front." Journal of Coastal Research, Vol. 24, No. 4, pp. 999-1007 (DOI: 10.2112/06-0688.1) (ISSN 0749-0208). {}

[3] CHANSON, H. (2009). "The Rumble Sound Generated by a Tidal Bore Event in the Baie du Mont Saint Michel." Journal of Acoustical Society of America, Vol. 125, No. 6 (DOI: 10.1121/1.3124781) (ISSN 00014966).

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Contributed By: Hubert Chanson

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