What are the reasons for the formation of the Qiantang River tide, and what is the reason for the fo

The cause of the Qianjiang tide.

Time of day: On the eighteenth day of the eighth month of the lunar calendar, the sun, the moon, and the earth are almost in a straight line, so the gravitational pull of the sea is the greatest on this day.

Geographical advantage: It is related to the trumpet-shaped shape of the Qiantang River estuary. Nearly 500,000 acres of reclamation land in the east of Zheshan on the south bank of the Qiantang River like a peninsula block the estuary, so that the Qiantang River Zheshan to the outer 12 sections resemble a bottle with a big mouth and a small mouth, the tide is easy to advance and difficult to retreat, the outer mouth of Hangzhou Bay is as wide as 100 kilometers, and the outer 12 sections are only a few kilometers wide, the riverbed in the eastern section of the estuary rises suddenly, the beach is high and the water is shallow, when a large amount of tide water pours in from the Qiantang estuary, because the river surface shrinks rapidly, the tide does not have time to rise evenly, so that the back wave pushes the front wave, the front wave does not run fast, the back wave catches up, layer upon layer.

Secondly, it is also related to the sedimentation of the Qiantang River, which blocks and rubs the tide, making the front slope of the tide steeper and the speed slowing down, thus forming the back wave to catch up with the front wave, a wave on top of each other, a wave high and a wave surge.

Winds: Southeasterly winds often blow along the coast of Zhejiang in summer and autumn, and the wind direction is roughly the same as the direction of the tide, which promotes the tide.

Hangzhou Bay outside the Qiantang River, wide on the outside and narrow on the inside, deep on the outside and shallow on the inside, is a very typical trumpet-shaped bay. The river at the mouth of the sea is 100 kilometers wide, and to the west to Pengpu, the river shrinks to 20 kilometers. When you reach the area of Yanguan Town in Haining, the river is only 3 kilometers wide.

At the beginning of the tide, the wide and deep mouth of the bay swallows a large amount of seawater at once, and because the river surface shrinks rapidly, it narrows and becomes shallow, and the tide that rises on the road does not have time to rise evenly, so the back wave pushes the front wave, and the wave is higher than the other. In the vicinity of Dajia Mountain, we encounter a huge barrage sand bar under water, and the tide rushes up, setting off a towering and amazing huge wave, forming a steep water wall, and causing the initial tide peak.

It is due to the tidal gravitational pull generated by the moon, which leads to the high tide of the Qiantang River.

There are many reasons for the formation of the tide of the Qiantang River, one of which is that when the three points of the sun, the moon and the earth are almost in a straight line, the tide is subject to the largest gravitational force, which leads to the formation of the tide. The second is that the trumpet-shaped topography of the Qiantang River estuary makes it easy for the tide to advance and retreat from the Zheshan Mountain of the Qiantang River. The third reason is that the Qiantang River often blows southeast winds, and the wind direction is roughly the same as the tide flow, which promotes the tide.

How the tide of the Qiantang River was formed

The main reasons for the formation of the Qiantang River tide are the gravitational effect of celestial bodies and the centrifugal action of the earth's rotation, the special topography of the Qiantang River flare mouth in Hangzhou Bay, and the effect of wind. The tide of the Qiantang River is very spectacular, it is a natural wonder of the world, in the eighteenth day of August of the lunar calendar every year, the tide head of the Qiantang River is as high as about 8 meters, and its advance speed is very fast, it can reach nearly 10 meters per second.

The mouth of the Qiantang River is in Hangzhou Bay, and its estuary is wide on the outside and narrow on the inside, with a width of 100 kilometers and a narrow place of only a few thousand meters. The trumpet-shaped topography makes it more and more constrained by the banks of the river the further it goes, thus causing the sea water to gush, and the water flowing out of the Qiantang River is blocked by the terrain and promotes the water level**, so the tide is wave after wave.

In Hangzhou, as long as there are days when there is a tide, it is possible to see a high tide anywhere along the Qiantang River, and you can see two wonders in a day: morning tide and evening tide. The tide of the next day is generally 40 minutes later than the tide of the previous day. Also pay attention to safety when watching the tide.

The perspective of watching the tide is also different in places where it is not used. Generally, you can go to Haining to see the first line of tide.

The Qiantang River estuary is a typical trumpet-shaped estuary, with a small inner mouth and a large outer mouth, with a width of kilometers from Luchao Port to the outermost mountain estuary; It is only a kilometer to the area of Pengpu, and the tide level has doubled compared with the outside, with an average meter for many years and a maximum record of meters; From the top of the river, the riverbed gradually rises rapidly, and the water depth becomes shallow, thus forming the tidal water of the Qiantang River.

1. Caused by the attraction of the moon: when the moon and the earth and the sun are in a straight line, and the sun and moon are facing the earth, the attraction is greatest.

2. The shape of the Qiantang River: the shape of the bell mouth plays a role in fueling the fire.

The reason for the formation of the Qiantang River tide is due to the attraction of celestial bodies, the centrifugal force of the earth's rotation, and the trumpet-shaped shape of the Qiantang River estuary, so that the combined action forms the world-famous majestic Qiantang River Bridge.

The main reason for the formation of the Qiantang River tide is the centrifugal action of celestial gravity and the rotation of the earth, coupled with the special topography of the bell mouth of the Qiantang River in Hangzhou Bay, so it will form a large tide.

The tide of the Qiantang River is a natural wonder of the world, and the tide of the Qiantang River is the largest on the eighteenth day of the eighth month of the lunar calendar every year. When the Sun, Moon, and Earth are almost in a straight line, the gravitational force of water is the greatest, which is the main reason for the occurrence of high tides.

The shape of the mouth of the Qiantang River is very similar to a trumpet, which makes the Qiantang River 12 kilometers outside the Zheshan Mountain, the tide is easy to enter but it is difficult to retreat, when a large amount of tide swells into the Qiantang River, due to the rapid shrinkage of the river surface, as long as the tide continues to rise, it forms the phenomenon that the back wave pushes the front wave, and because the southeast wind often blows in the Qiantang River area, which is consistent with the direction of the tide, and also promotes the tide.

How was the Qiantang River tide calendar formed?

1.The main reason for the formation of the tide of the Qiantang River is that when the sun, the moon and the earth are almost on the same straight line, the tide is subjected to the largest gravitational force, so the tide is formed, and another reason is that the topography of the Qiantang River estuary is presented as a Lachan Chang trumpet, which also plays a certain role in the formation of the tide.

2.The best time to observe the tide of the Qiantang River is generally around August 15 to August 20 of the lunar calendar, and the river water originates in Huangshan City, Anhui Province, and flows through Anhui and Zhejiang provinces.

3.Qiantang River is the name of the province established in Zhejiang Province in the early Ming Dynasty, is the largest river in Zhejiang Province, and is also one of the important birthplaces of Chinese civilization.

4.The tide of the Qiantang River is known as "the first tide in the world", is a great wonder of the world, the tide began in the Han and Wei dynasties, prevailed in the Tang and Song dynasties, has a history of more than 2,000 years.

The tide of the Qiantang River.

The main reasons for its formation:

The formation of the tide of the Qiantang River is due to the gravitational pull of celestial bodies and the rotation of the earth.

The centrifugal effect is caused by the special topography on the edge of the Qiantang River.

Hangzhou Bay where the Qiantang River flows into the sea.

It is trumpet-shaped, with a big mouth and a small belly, so when a large amount of blanching water is drunk, the tide will be hindered, and the tide behind it will be very rapid, so there will be a thrilling and spectacular scene of the tide.

According to the research of scientists, the generation of the tide of the Qiantang River and the speed of the water flow and the speed ratio of the tide wave are also related to a certain extent, when the speed of the water flow and the speed of the tide wave are about the same, it is more conducive to the generation of the tide, but the difference between the two is relatively far, even if the terrain is better, it is difficult to form a tide, that is, all kinds of reasons together can appear the tide of the Qiantang River that we see now.

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Hangzhou Bay outside the Qiantang River, wide on the outside and narrow on the inside, deep on the outside and shallow on the inside, is a typical trumpet-shaped bay. When the tide rises, the wide and deep mouth swallows a large amount of seawater, because the river surface shrinks rapidly and narrows and becomes shallow, the upwelling tide does not have time to rise evenly, to the vicinity of Dajia Mountain, and encounters the underwater barrage sand bar, the tide forms a steep water strength, resulting in the initial tide peak. In Zhejiang, southeast winds often blow in summer along the draining air and hungry sea, which fuels the tide.

On the eighteenth day of the eighth month of the lunar calendar, the sun and the moon.

The Earth is almost in a straight line, and the gravitational pull of seawater is greatest. Under the influence of the moon's gravity, the long incoming tide advances upstream at a speed of 5-7 meters per year, forming the great tide we see.

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First of all, this is related to the shape of Hangzhou Bay, where the Qiantang River flows into the sea, and its special topography, which is trumpet-shaped and has a large mouth and a small belly. The Qiantang River narrows and rises sharply from the west of Luopu, causing the capacity of the riverbed to shrink suddenly, and a large amount of tidal water crowds into the shallow channel.

The tide head is obstructed, and the tide behind it advances rapidly, forcing the tide head to stand steeply, break, and roar, resulting in a thrilling and spectacular scene. Secondly, the Qiantang River is located in the coastal area, and the southeast wind often blows, and the wind direction is roughly the same as the direction of the tide, which promotes the tide.

There are three reasons for the formation of the tide of the Qiantang River, the first point is that when the three points of the sun, the moon and the earth are almost in a straight line, the tide is subject to the largest gravitational force, which leads to the formation of the tide; The second point is that the trumpet-shaped topography of the Qiantang River estuary makes it easy for the tide to advance and retreat from the Zheshan Mountain of the Qiantang River; The third point is that the Qiantang River often blows southeast winds, and the direction of the wind and the direction of the tide flow are roughly the same, which encourages the tide to grasp the momentum.

In fact, the main reason for the formation of the Qiantang River is the gravitational action of celestial bodies and the centrifugal effect of the earth's rotation, and the special topography and wind effect of the bell mouth of the Qiantang River in Hangzhou Bay. The tide head of the Qiantang River can be as high as about 8 meters, and the advance speed is very fast, reaching nearly 10 meters per second.

Due to the trumpet-shaped topography of the Qiantang River, the more the estuary goes inside, the more it is bound by both sides of the river, so it leads to the accumulation of seawater, and the water flowing out of the Qiantang River is blocked by the terrain and promotes the water level, so the tide is wave after wave.

In the days of the tidal flood in Hangzhou, you can see the two wonders of morning tide and evening tide in one day. The next day, oh, the tide is usually 40 minutes later than the previous day's tide. When watching the tide, you need to pay attention to safety, and the perspective of watching the tide in places where you don't use it is also different.