When a rising Atlantic tide crosses the edge of the continental shelf into the shallow Gulf of Maine, it travels as a long wave to the head of the Bay of Fundy, reflects, and returns to the edge of the continental shelf. The “parent” is the small Atlantic tide at the edge of the continental shelf. In the case of Fundy tides, the “swing” is the shallow body of water between the edge of the continental shelf east of Boston and the head of the Bay of Fundy. If the timing is poor, the swing will not move much. The parent must time the pushes to closely match the natural period of the swing, a condition called resonance. A gentle, repetitive push by the parent will sustain a large back-and-forth motion of the swing. Imagine a parent pushing their child on a swing. Why are Fundy tides so high? Resonance - like a push on a swing Select time zone AST for dates before March 13 and after November 6. Truro (via Canadian Hydrographic Service website) Select time zone ADT for dates March 13 – November 6, 2022.Fundy Discovery Site: June 2022 – January 2023.This is most likely to happen if the tide is a minimal apogean-neap tide ( the Moon furthest from Earth and at its first- or last-quarter phase). Occasionally, because of much rain and/or rapid snow melt, the river may be too deep for a tidal bore to form.
#BAY OF FUNDY TIDE GRAPH FULL#
The largest tidal bores in the Salmon River occur on the days of perigean-spring tides ( the Moon closest to Earth and at its new or full phase). Why does the size of the tidal bore in the Salmon River vary? If a tidal bore encounters water that is much deeper than the height of the bore, the bore collapses into a barely noticeable, smooth surge of rising water. Shallow river water – The water in the river prior to the arrival of the bore must be relatively shallow.Higher riverbed – The riverbed must be well above the level of the low tide so that the tide is rising rapidly when it enters the part of the river where a tidal bore might appear.Almost flat riverbed – The riverbed must have a very gentle, downstream slope.Three conditions are necessary to form a tidal bore: However, a tidal bore does not occur in every river flooded by a high tide. Tidal bores occur in regions of the world that have large tides. A tidal bore is a tumbling wavefront which moves upstream in a river, announcing the arrival of an incoming tide.
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