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A bore in Morecambe Bay, in the United Kingdom Video of the Arnside Bore, in the United Kingdom The tidal bore in Upper Cook Inlet, in Alaska. A tidal bore, [1] often simply given as bore in context, is a tidal phenomenon in which the leading edge of the incoming tide forms a wave (or waves) of water that travels up a river or narrow bay, reversing the direction of the river or bay's current.
The tidal bore occurs only during the flood tide, never the ebb tide. A tidal bore can create a powerful roar that combines the sounds caused by the turbulence in the bore front and whelps, entrained air bubbles in the bore roller, sediment erosion beneath the bore front and of the banks, scouring of shoals and bars, and impacts on obstacles.
Head of tide, tidal limit [2] or tidehead [3] is the furthest point upstream where a river is affected by tidal fluctuations, [4] or where the fluctuations are less than a certain amount. [5] The river section influenced by tides and marine forces, but without salinity is a tidal river. Downstream areas are brackish and termed estuaries. [6]
Tidal range is the difference in height between high tide and low tide. Tides are the rise and fall of sea levels caused by gravitational forces exerted by the Moon and Sun , by Earth's rotation and by centrifugal force caused by Earth's progression around the Earth-Moon barycenter .
A flood watch had been in effect for Houston until 7 p.m. Friday but was extended into Sunday afternoon, the National Weather Service in Houston said in a post on X. An additional 1 to 3 inches of ...
Before the construction of a causeway in 1968 and subsequent siltation of the river, the Petitcodiac River had one of the world's largest tidal bores, up to two metres (6.6 ft) high. Since the opening of the causeway gates in 2010, the bore has been coming back, and in 2013 surfers rode it a record-breaking 29 kilometres (18 mi). [8]
Hundreds lined up outside Houston’s Bayland Community Center for ice, military style rations and water. Local officials are still trying to get more aid to those without electricity.
In the center of Houston, few people ventured out into the snow as some restaurants and bars remained closed. A rare winter storm churned across the U.S. Gulf Coast on Tuesday, bringing heavy snow ...