![]() For instance, Furgerot (2014) showed that in the Sée/Mont Saint Michel estuary, Tr_0 must be larger than 10 m for tidal bore formation in the Sée River and, on the other hand, Bonneton et al. However, such a simple criterion is not sufficient to classify estuaries in terms of tidal bore occurrence. It appears that tidal bores generally occur for large tidal ranges ( Tr_0) at the estuary mouth. Table 1 presents estuaries and tidal rivers in which significant tidal bores have been observed (a more complete overview can be found in Bartsch-Winkler and Lynch (1988) and a recently updated catalog by Colas (2017) ). If the tidal wave can propagate sufficiently far upstream the river without strong damping, the tidal wave front may become so steep that a water level jump – a so-called tidal bore - can form at the beginning of the rising tide. The tidal rise period is shortened and the tidal wave becomes steeper during propagation. HW propagates considerably faster than LW if the mean channel depth D_0 is not much greater than the spring tidal range 2a (same order of magnitude or a few times larger) and if the intertidal area is not much greater than the tidal channel surface area. In many estuaries the high-water (HW) tidal wave crest propagates faster up-estuary than the low-water (LW) tidal wave trough. When a tidal wave propagates upstream into an estuary, its shape is progressively distorted. The maximum tidal range is the maximum range recorded at a tide gauge situated close to the location in the estuary where the tidal range is highest.īay of Fundy, Petitcodiac and Salmon riversĪmazon, Araguira, Guama, Capim and Mearim Rivers Estuaries and rivers with substantial tidal bores (bore height of half a meter up to several meters). Right image : Undular tidal bore on the Garonne River (Bonneton et al. Left image : Partially breaking tidal bore on the Dordogne River (Courtesy of Antony “YEP” Colas).
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