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Abstract
Flood waves resulting from dam breaks have been responsible for numerous losses of life through centuries. Both the 26 December 2004 tsunami and 11 March 2011 Tohoku catastrophes were human tragedies of international significance. An important point is the physical analogy between dam break waves travelling downstream, tidal bores progressing deep inland, in-river tsunami propagating upstream, as well rejection surges in hydropower canals. The leading edge is a hydrodynamic shock, with a marked discontinuity in free-surface elevation and velocity and pressure fields, and a tri-phase flow with three distinct flowing phases, i.e. liquid (water), solid (sediment) and gas (air). Seminal features of bores and surges include a net mass flux, the breaking in shallow waters, and the intense turbulence at the front associated with massive sedimentary processes and air entrainment in the breaking roller. In this keynote talk, physical experiments, numerical CFD modelling and field observations are presented and compared. Current knowledge gaps are discussed. Ultimately it is argued that the 'solitary wave' analogy is not directly relevant to model the unsteady turbulent mixing of in-river tsunami surges, tidal bores and dam break waves.Recorded Presentation from the vICCE (YouTube Link): https://youtu.be/SQaPoSj2lP4
References
BAILLY, C., and COMTE-BELLOT, G. (2015). "Turbulence." Springer, Heidelberg, Germany. 360 pages.
CHANSON, H. (2005). "Le Tsunami du 26 Décembre 2004: un Phénomène Hydraulique d'Ampleur Internationale. Premier Constats." ('The 26 December 2004 Tsunami: a Hydraulic Engineering Phenomenon of International Significance. First Comments') Journal La Houille Blanche, No. 2, pp. 25-32.
CHANSON, H. (2009). "Application of the Method of Characteristics to the Dam Break Wave Problem." Journal of Hydraulic Research, IAHR, Vol. 47, No. 1, pp. 41-49 (DOI: 10.3826/jhr.2009.2865).
CHANSON, H. (2012). "Momentum Considerations in Hydraulic Jumps and Bores." Journal of Irrigation and Drainage Engineering, ASCE, Vol. 138, No. 4, pp. 382-385 (DOI 10.1061/(ASCE)IR.1943-4774.0000409) (ISSN 0733-9437).
CHANSON, H., and BROWN, R. (2018). "Stability of Individuals during Urban Inundations: What Should We Learn from Field Observations?" Geosciences, Vol. 8, No. 9, Paper 341, 9 pages (DOI: 10.3390/geosciences8090341).
CHANSON, H., and TOI, Y.H. (2015). "Physical Modelling of Breaking Tidal Bores: Comparison with Prototype Data." Journal of Hydraulic Research, IAHR, Vol. 53, No. 2, pp. 264-273 (DOI: 10.1080/00221686.2014.989458).
KEEVIL, C.E., CHANSON, H., and REUNGOAT, D. (2015)." Fluid Flow and Sediment Entrainment in the Garonne River Bore and Tidal Bore Collision." Earth Surface Processes and Landforms, Vol. 40, No. 12, pp. 1574-1586 (DOI: 10.1002/esp.3735) (ISSN 0197-9337).
LENG, X., and CHANSON, H. (2019). "Two-phase Flow Measurements of an Unsteady Breaking Bore." Experiments in Fluids, Vol. 60, No. 3, Paper 42, 15 pages & 2 video movies (DOI: 10.1007/s00348-019-2689-2).
LENG, X., CHANSON, H., and LUBIN, P. (2018). "Air Bubble Entrainment in Breaking Bores: Physical and Numerical CFD Modelling." Proceedings of the 6th IAHR International Symposium on Hydraulic Structures ISHS 2018, Aachen, Germany, 15-18 May, B.P. TULLIS and D.B. BUNG Editors, 11 pages (DOI: 10.15142/T3FS9Q).
MOUAZE, D., CHANSON, H., and SIMON, B. (2010). "Field Measurements in the Tidal Bore of the Sélune River in the Bay of Mont Saint Michel (September 2010)." Hydraulic Model Report No. CH81/10, School of Civil Engineering, The University of Queensland, Brisbane, Australia, 72 pages (ISBN 9781742720210).
PAN, D.Z., and CHANSON, H. (2015). "Physical Modelling of Tidal Bore Dyke Overtopping: Implication on Individuals' Safety." Proc. 36th IAHR World Congress, The Hague, The Netherlands, 27 June-3 July, Theme 4, pp. 3824-3831.