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Undular bores occur in oceans (final stage of tsunamis, mascarets in estuaries) as well as in rivers or channels (Favre waves upstream from hydraulic dams). They look like a long, undulating hydraulic jump without air-water mixing. Undular bores are difficult to understand and to model, whether it be from a theoretical perspective or through numerical simulation, because they are both non-linear and dispersive, i.e., they have arbitrary amplitudes and moderate wavelengths.
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