= Undular bore
{wiki=Undular_bore}
An undular bore is a type of wave phenomenon typically observed in shallow water bodies, such as rivers or estuaries, where a sudden change in flow conditions leads to the formation of waves. This phenomenon is characterized by a series of oscillations or undulations that occur as a result of the interaction between a flowing fluid and a sudden change in water depth, velocity, or other conditions, such as the inflow of water from rainfall or upstream sources.
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