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You are here : eLibrary : IAHR World Congress Proceedings : 36th Congress - The Hague (2015) ALL CONTENT : Water engineering : Physical modelling of tidal bore dyke overtopping: implication on individuals' safety
Physical modelling of tidal bore dyke overtopping: implication on individuals' safety
A tidal bore is a surge of waters propagating upstream as the tidal flow turns to rising and the flood tide rushes into a
funnel-shaped river mouth. The bore forms during the spring tides when the tidal range exceeds 4ĘC6m and the rising
tidewaters are confined to the narrow funnelled estuary. The tidal bore can be a major tourism attraction. In China, the
Qiantang River bore attracts more than 300,000 people each year for the Moon festival while the bore propagation is seen
live on television by over 15 millions of television spectators. All the year around, tens of thousands of tourists come to see
the tidal bore during spring tide conditions. In Europe, the Dordogne and Severn Rivers are the sites of well-known tidal
bore surfing competitions that many individuals come to watch. In the early 1960s, the mascaret of the Seine River
attracted more than 20,000 people during the weekends. When the river banks are protected by dykes, these become
attractive view points, despite the hazards caused by the risks of bore overtopping. For the last 20 years in China, over 80
people are drowned in the Qiantang River bore flood tide motion. Herein a physical study was conducted in a relatively
large size facility. The upstream propagation of a tidal bore in a compound channel was investigated based upon a Froude
similitude. The data highlighted the occurrence of transient secondary currents in the wake of the bore front. The results
demonstrated that these currents constituted major hazards for individuals standing on the dyke.
File Size : 578,862 bytes
File Type : Adobe Acrobat Document
Chapter : IAHR World Congress Proceedings
Category : 36th Congress - The Hague (2015) ALL CONTENT
Article : Water engineering
Date Published : 18/08/2015
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