Qiantang River spring tide is a famous sea tide in China, which is the first natural wonder in the world. It is the centrifugal effect of the gravity of celestial bodies and the rotation of the earth. In addition, the extraordinary surge caused by the special topography of the bellmouth of Hangzhou Bay is the largest one around the mid Autumn Festival and there is a small tide every month. Every year, the Mid Autumn Festival is the best time to watch the Qiantang River spring tide, so don't miss it.
Brief introduction of Qiantang River spring tide
Qianjiang tidal bore is the first natural wonder in the world. It is caused by the centrifugal action of the gravity of celestial bodies and the rotation of the earth and the special topography of the bell mouth of Hangzhou Bay.
"Qianjiang tidal bore" is famous at home and abroad, as early as the Tang and Song Dynasties has been popular. The Qiantang River spring tide, with its spectacular scene of "the huge turbid waves are emptied, the rivers are overturned and the mountains are destroyed", attracts numerous people to watch. It's one of the two famous tides in the world
After being incorporated into the development of modern tourism industry, Qian Jiangchao has set a record of gathering and scattering more than one million self paid tourists in three or five days. However, under the charming temptation of the tide, there is a hidden danger. According to relevant reports, every year, people die from watching the Qianjiang River tide.
People's ignorance of the causes and laws of the surge is one of the main reasons for the tragedy. There are regular tides. Spring tides rise on the first and 15th day of the lunar calendar. At this time, the three celestial bodies of the moon, the earth and the sun are almost in the same straight line, and the tide generating force of the moon and the sun almost acts in the same direction. The joint force of the two is the greatest, and the sea water will rise to the highest level and fall to the lowest level, that is, the spring tide.
On the eighth and the twenty third day of the lunar calendar, the sun, the moon and the earth form a right angle. At this time, the joint force of the sun tide generating force and the moon tide generating force is the smallest. At this time, there are two lowest high tides and the highest low tides, which are called "semidiurnal tides". Generally, the sea water in most parts of the earth appears such tides every day. In some places, the tidal range of two high tides and two low tides is very large, and the fluctuation time is not equal to 'mixed tide'. In some places, there is only one high tide and one low tide in a day. The interval between the high tide and the low tide is about 12 hours and 25 minutes, which is called "all day tide".
The Qianjiang tide is mainly formed by the special topography of the entrance of Hangzhou Bay, which is a typical trumpet shaped bay with wide outside and narrow inside, deep outside and shallow inside. The width of the river at the mouth of the sea is up to 100km, and it stretches westward to Shupu. The river suddenly shrinks to 20km.
When we arrived at Yanguan Town, Haining, the river was only 3 kilometers wide. When the tide rises, a large amount of sea water is swallowed in the wide and deep bay mouth. As the river surface shrinks rapidly, it becomes narrower and shallower, and the tide on the road cannot rise evenly, so the back waves push the front waves, and each wave is higher than the other. Near Dajia mountain, there is a huge sand bar under the water. The tide surges up, setting off a towering huge wave, forming a steep water wall and creating a new tide peak.
The "Qianjiang tide" has two tides every day, with an interval of about 12 hours. The arrival of tides every day is postponed for about 45 minutes, and the cycle is regular for half a month. The highest tide head is 3.5m and the tidal range is 9m.
When is the best time to watch the spring tide of Qiantang River in 2018
The best watch time schedule of Qiantang River in 2018: the best watch time is from August 15 (October 4) to August 20 (October 9) of the lunar calendar, half an hour in advance. Among them, 1-2 PM is the best.
Qiantang River is located in Qiantang River Bridge, Binjiang District, Hangzhou City, Zhejiang Province (opposite the Liuhe tower). It is a free scenic spot open all day. September October is the best time for tourists here.
Warm tip: Qiantang River spring tide is the largest in August 18 of the lunar calendar, and the tide can be seen from the first to the fifth day of each lunar month, from the 15th to the 20th, so there are 120 days in a year to watch the tide.
2018 Qiantang River tide table query
The rising and falling time of tide is 3:30 and 16:00, and the ebbing time is 9:45 and 22:15.
The best viewing time of Qiantang River in 2018: around the Mid Autumn Festival (September 21-27, 2018), in which the best time is 1-2 pm on August 18 (September 27) of the lunar calendar.
Qiantang River spring tide is the largest in August 18 of the lunar calendar, and the tide can be seen from the first to the fifth day of every month, from the 15th to the 20th, so there are 120 days in a year to watch the tide.
Warning of Qiantang River danger:
1. Don't walk down the steps of the flood control embankment to watch the tide. When the tide surges up like a lion, the waves are heavy and hurtle at people, the tide watchers are often unprepared. There is no space for thinking, and people have been swallowed up by the waves.
2. There is a warning sign written on the quay beside the river that "the tide is dangerous and the tourists stop", which is always invisible to those who are keen on watching the tide, but at night, they can't see clearly if they want to.
3. According to the riverside residents, some young people often stand in low-lying, non tidal spots to watch the tide. They don't understand the law of the ebb and flow of the tide, and they don't know that the power of the tide can hurt people's lives. They are so confused and their young lives will never return.
The law of Qiantang River surge
Qiantang River surge is a natural wonder in the world. It is caused by the centrifugal action of celestial gravity and earth rotation and the special topography of the mouth of the trumpet in the Jiangzhou Bay of Hangzhou Qiantang River.
Scientists believe that the generation of the surge is also related to the ratio of the velocity of the current in the river to the velocity of the tide wave. If the velocity of the two is the same or similar, and the potential is even, it is conducive to the generation of the surge. If the velocity of the two is very different, though there is a trumpet shaped estuary, the surge cannot be formed.
The Qianjiang tide is mainly formed by the special topography of the entrance of Hangzhou Bay, which is a typical trumpet shaped bay with wide outside and narrow inside, deep outside and shallow inside. The width of the river at the mouth of the sea is up to 100km, and it stretches westward to Shupu. The river suddenly shrinks to 20km. When we arrived at Yanguan Town, Haining, the river was only 3 kilometers wide.
When the tide rises, a large amount of sea water is swallowed in the wide and deep bay mouth. As the river surface shrinks rapidly, it becomes narrower and shallower, and the tide on the road cannot rise evenly, so the back waves push the front waves, and each wave is higher than the other.
Near Dajia mountain, there is a huge sand bar under the water. The tide surges up, setting off a towering huge wave, forming a steep water wall and creating a new tide peak.
The "Qianjiang tide" has two tides every day, with an interval of about 12 hours. The arrival of tides every day is postponed for about 45 minutes, and the cycle is regular for half a month. The highest tide head is 3.5m and the tidal range is 9m.