The results showed the potential development of a large scour hole around the cylindrical element. This resulted in longer transient recirculation both upstream and downstream of the element and larger maximum velocity recirculation magnitudes, as well as enhanced turbulent stress levels and potential bed erosion around the large element, within two diameters from the element centre. During the tidal bore propagation, the presence of the element had negligible effect on the free-surface properties, but a significant impact in terms of the instantaneous velocity and Reynolds stresses. The Moncton tidal bore laps the shore Auric via Wikimedia (Creative Commons) Meandering peacefully across New Brunswick, the Petitcodiac River is, for the most part, a totally normal river. In most tidal rivers the change from ebb to flood is gradual: the ebb current downstream slows, there is a period of slack. In the initially steady flow, the large cylindrical element generated a wake region, with extents comparable to steady flow literature. This study investigates experimentally the propagation of tidal bores over a large cylindrical roughness element, representative of damaged bridge pier foundation. Also called mascaret (French), pororoca (Brazilian), and the Bono (Indonesian) tidal bores occur when the water in relatively shallow, sloping estuaries or rivers moves as one massive solitary wave. A tidal bore is a hydrodynamic shock, surging upstream in some shallow-water bays and estuaries during the flood tide under large tidal range. The name tidal bore, also called a bore tide, is a bit of a misnomer these natural occurrences are anything but boring.
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