![]() However, as with many natural phenomena, prediction is not an exact science, so sometimes no wave occurs. The timing also depends on a number of factors, including wind conditions, the river flow, and the distance from the coast.īefore going out, some research is therefore needed, including checking tide times. For others, though, tidal bores occur in most months of the year. In some estuaries, the best time to see tidal bores is on a few days around the highest spring tides, particularly around the Spring and Autumn equinoxes. Both towns are more than 20 miles from the coast. Some can travel a long way inland, such as the Trent Aegir, which reaches Gainsborough, and the Mersey tidal bore, which ends on hitting a weir near the centre of Warrington. On the best days, as the tidal bore passes there is a line of surf and a series of waves may follow, known as whelps. ![]() On calm wind days, there may also be a distant roar of breaking waves and surf. With luck, birdwatchers and photographers may even be able to see spectacular aerial displays known as murmurations, in which birds twist and turn as if fleeing from a predator. Wading birds often give the first sign of a tidal bore’s approach as they leave the sands and mudflats to fly to their high tide roosts. Tidal bores occur when the incoming tide is funnelled into the narrow space of an estuary. However, most others are smaller affairs unsuited to such outdoor pursuits, although still wonderful to see, such as the Arnside Bore and the Mersey Tidal Bore. The largest and most famous is the Severn Bore and in the right conditions attracts large crowds of spectators to watch surfers and canoeists try their luck. Indeed, of the hundred or so worldwide, about twenty are found in the UK’s estuaries, from Somerset to southwest Scotland and from East Anglia to the Humber Estuary. You can copy them and use them in your class.Some of the highest tides in the world occur in the UK, leading to the formation of tidal bores: a line of surf or waves travelling upstream against the river flow. Source: Are you a teacher? Download the exercises for your class here. The natural wonder also attracts many surfers looking to challenge themselves by riding the waves of the tidal bore up the river.ĭifficult words: tidal (relating to a tide which the rising and falling of the sea), bore (wave caused by the meeting of two tides), phenomenon (something which happens in the nature), coincide (happen at the same time as something else). The phenomenon usually starts at the beginning of the eighth lunar month and reaches its peak on the 18 th day, three days after the Mid-Autumn Festival. Locals and tourists gathered along the banks of the river in the cities of Haining and Hangzhou early in the morning to witness the amazing phenomenon, with some staying until late at night.Ĭoinciding with China’s traditional Mid-Autumn Festival, the “one-line tide”, which is a special form of tidal bore that rolls forward at the same speed to form a straight line, travelled up the river. Thousands of people lined the banks of the Qiantang River in China on Monday to watch the world famous tidal bore.
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