The world s most famous tidal waves, which are the three major tidal rivers in the world

China's Qiantang River tide is known as "the first tide in the world" and is a natural wonder in the world.

In the eyes of the ancients, the Qiantang River had the largest tide on the eighteenth day of the eighth month of the lunar calendar every year.

Anyone who has been to the beach will see such a scene: sometimes the sea is like a wild horse, rushing towards the shore; Sometimes the sea retreats far from the shore like a deserter. This regular rise and fall of the sea is called a tide.

The famous Qiantang River has the largest tide on the eighteenth day of the eighth month of the lunar calendar every year, especially around the Mid-Autumn Festival, which is the closest time of the year for the earth to the sun, so the autumn tide around the fifteenth day of the eighth month of the lunar calendar is the largest of the year. The autumn tide of the Qiantang River is more spectacular than that of other places, which is due to the special topography of Hangzhou Bay.

The place where the Qiantang River flows into the sea is called Hangzhou Bay. Hangzhou Bay is wide on the outside and narrow on the inside, with a width of up to 100 kilometers at the sea, and only three kilometers wide to the west near Yanguan Town, Haining County. As soon as the tide enters Hangzhou Bay, the water surface is wide, and the further west it goes, the more it is constrained by the topography on both sides of the river, so it has to gush up, and the tide head accumulates higher and higher, like an upright wall of water, pushing westward.

Hello. The world's most famous tidal wave is the tide of the Qiantang River in China. It is a type of wind surge that occurs in Hangzhou Bay (the estuary section of the Qiantang River).

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The world's three major tidal wonders are the Qiantang strong tidal river in Zhejiang, the Amazon strong tidal river, and the Ganges strong tidal river. The Qiantang River in Zhejiang, together with the Amazon River and the Ganges River, is known as the world's three major tidal rivers.

The Qiantang River tide is known as "the first tide in the world" and is a natural wonder of the world, which is caused by the centrifugal action of celestial gravity and the rotation of the earth, coupled with the special topography of the horn mouth of Hangzhou Bay.

The 160 kilometers of the Amazon River from the mouth of the river to the north to the boundary of Guyana are sandy beaches and reefs, and the tide here is called the tide wave, the water depth is less than 7 meters, but the tide roars loudly, hitting the coast at a speed of 15 to 25 kilometers per hour, and the wave reaches up to 4 meters in the mountains of Fencha, so the Amazon does not form a delta, and the sea quickly sweeps away the sediment carried by the Amazon.

The Ganges is in the middle of Allahabad to West Bengal, and the Ganges receives the largest tributary, the Jumuna River, which has a great increase in volume, widening the surface of the river, curved shape, and flat terrain. In the dry season, the river is about 1km wide; In the rainy season, the river is 5 6km wide. Then it carried the middle stream to Varanasi, the holy land of Hinduism, and gathered many tributaries, and rushed downstream.

There are three main causes of the swell:

Celestial gravitational force: This is the most important cause of tidal surges, mainly due to the gravitational pull of the Moon and the Sun on the Earth. The gravitational pull of the Moon and the Sun can cause the rise and fall of the seawater, and this gravitational force is called celestial tidal gravitation.

Topography: The bay or estuary of the bell mouth is the place where the tide is formed, and the bay or estuary with the outer width and the inner narrow makes the water level of Haijing Xushui limited, which increases the self-purification energy of the water body, thereby weakening the strength of the tide.

In terms of China's coastal areas, the southeast monsoon and the storm surge of typhoons are important factors in the swelling of tides. The southeast monsoon brings abundant water vapour to the oceans, while typhoons provide ample momentum to make the waves higher and form powerful tidal surges.

In general, the gravitational force of celestial bodies is the most important cause of tidal wells, while topography and wind are auxiliary causes. The causes of high tides may vary depending on the geographical environment.

Qiantang Bore is one of the three major tidal surges in the world, which is caused by the centrifugal action of celestial gravity and the rotation of the earth, coupled with the special topography of the horn mouth of Hangzhou Bay. Yanguan Town, Haining, Zhejiang Province, is the first resort for tide watching (the best tide viewing resort), so it is also called"Haining tide"。

In Chinese history, there are three most famous tidal places: Qingzhou Yongchao in Shandong, Guanglingtao and Qiantang Chao. In the world, the Qiantang tide is one of the three major tides in the world, these three tides are the Ganges tide in India, the Amazon tide in Brazil and the Qiantang tide in China.

Shiyun:"Qiantang looked at the waves, and the tide was in front of him in an instant; It seems that in the ordinary river water, the energy can be shocking. "At the beginning of the tide, a white line flashed on the river surface, accompanied by a rumbling sound, the tide head came from far and near, galloping, the tide head pushed, the sound was like thunder, in an instant, the tide peak rose a water wall three or four meters high and stood upright on the river surface, spraying beads and splashing jade, the momentum was like ten thousand horses galloping.

Tide watching began in the Han and Wei dynasties, flourished in the Tang and Song dynasties, and has become a local custom after more than 2,000 years.

Qing Fei Ao Huang (1664-) "Guangling Tao Debate" cloud:"In the Spring and Autumn Period, the tide flourished in Shandong, and the Han and Six Dynasties flourished in Guangling. After the Tang Dynasty and the Song Dynasty, the tide flourished in Zhejiang, covering the earth from north to south, and there were those who really knew it"。

The Qiantang tide appeared later than Guanglingtao, and was formed in the Eastern Han Dynasty at the latest. Wang Chong's "On Balance: The Book of Fiction" mentions"Zhejiang, Shanyin River and Shangyu River all have waves"。He also said that Qiantang Zhejiang at that time"All set up the temple of Zixu, and the cover wanted to comfort its hatred and stop its fierce waves"。

However, Wang Chong only said"There are waves in the Qujiang River in Guangling, and the literati give it", did not say that the Qiantang River tide. It can be seen that in the Eastern Han Dynasty, Qiantang Chao was far less famous than Guanglingtao. It is estimated that the custom of watching the tide in Qiantang had not yet been formed at that time.

The tidal surge that occurs at the mouth of the Qiantang River in Hangzhou Bay, China, is the most famous tidal surge in the world. It is surging and surging, like an upright wall of water, pouring mountains and seas, and the angry tide is rolling and unstoppable. The earliest description of the tide scene in the Western Han Dynasty of China is the first to describe:

The thunder is heard for hundreds of miles, the river flows backwards, and the tide ...... on the seaWaves surge and waves. Ge Hong of the Eastern Jin Dynasty: "The tide of the water is ......."Zhejiang water from the east, the land is wide and far away, at first into the narrow place, the Lingshan touches the shore, from the straight to the curve of its momentum does not leak, so the long chong gushing and for the waves.

The tidal waves along the coast of China are mainly transmitted from the Pacific Ocean, and the coast of Zhejiang and the area around Hangzhou Bay are in the brunt. Coupled with the influence of the topography of Hangzhou Bay, the tidal range is very large, and it can be as high as g meters in Haining. Hangzhou Bay is connected to the Qiantang River estuary, which is in a typical funnel shape, the water area becomes shallow and narrow, and the potential energy per unit volume of seawater increases.

The tidal wave that enters Hangzhou Bay from the East China Sea meets the river here, and the wave surface is subject to great resistance. Fragmentation of the leading edge of the tidal wave crest; It also encountered an underwater sand bar, forcing the tide to divide into two branches, "East Lake" and "South Lake", and continue to advance towards the estuary. And the refraction, reflection and convergence of tidal waves occur between Jianshan and Haining, and sometimes can stir up more than 10 meters high water column The broken tide peak presents rolling white waves, the height is 1-2 meters, and it spreads at a speed of 4-6 meters per second, and the tide level rises by more than 2 meters in a short period of time.

Around 18 August of the lunar calendar every year, the tide is close to the autumn equinox, and the rainy season is in place along the coast of the East China Sea, and the mean sea level rises. In the event of a strong easterly or southeasterly wind, the wind boosts the tide, making the tide even more spectacular, the world's most famous tide.

The Qiantang tide is the most famous tide in the world, and the Qiantang River tide is the largest in Hangzhou Bay on the eighteenth day of the eighth lunar month every year.

The other two major tides are the Indian Ganges tide and the Amazon tide.

It should be the tide of the Qiantang River.

The most famous tidal surges in China's history include the Qingzhou tide in Shandong, the Guangling tide in Jiangsu and the Qiantang tide in Hangzhou.

Now the tide in Qingzhou, Shandong and Guangling, Jiangsu are gone, only the tide of the Qiantang River is still surging. At present, the only thing comparable to the Qiantang tide in the world is the uninhabited Brazilian Amazon estuary tide.

Watching the autumn tide in Qiantang has become a trend as early as the Han, Wei and Six Dynasties, and this wind is more prosperous in the Tang and Song dynasties. According to legend, August 18 of the lunar calendar is the birthday of the tide god, so the tide peak is the highest. The court of the Southern Song Dynasty once stipulated that on this day, the colonel of the Qiantang River will read the water division, and then it will become a habit along the way, and August 18 will gradually become the tide watching festival.