What is the sand and how does it come about, and what does it do to the estuary tides?

Kan is just a form of description, sand is shashakan just describes a sandy protrusion at the bottom of the river, which is the result of the interaction between river water and seawater, appears in the estuary area, which geologically corresponds to the estuarine sand bar of the delta mouth bar, the most famous sand bar is Chongming Island, but it is not the different shape of the estuary, there are differences in the factors affecting the development of sand bars, the relationship between the strength of rivers and waves, and the influence of tidal action will affect the shape of specific sand bars

Shakan is a geomorphological phenomenon in the estuarine area, it is a sandy protrusion, due to the interaction of river water with seawater, which geologically corresponds to the estuarine sand bar of the delta.

The occurrence of sand kan is due to the combination of factors such as the strength of rivers and waves, the influence of tidal action, and other factors. Specifically, sand sand are formed when rivers carry a relatively small amount of sediment and the erosion of waves or tides is strong.

The sand can have an impact on the estuary and the tides. Under the condition of straight and curved river channels, the change of sand kan morphology will affect the scouring and silting changes of the river channel, and then affect the tidal rise and fall of the estuary. On the other hand, the presence of sand cans can also cushion the impact of flooding and protect the riverbank from excessive erosion.

In general, sand kan is a geomorphological phenomenon formed by the interaction of river water with seawater, and its presence and change can have an impact on estuaries and tidal waters.

Kan is just a form of description: sand is sand.

Shakan simply describes a sandy protrusion at the bottom of the river.

It is the result of the interaction between the river and the seawater, which occurs in the estuary area, which geologically corresponds to the delta estuarine sand bar, and the most famous sand bar is Chongming Island.

However, there are differences in the factors affecting the development of sand bars, the relationship between the strength of rivers and waves, and the influence of tidal action will affect the shape of specific sand bars

The tide of the Qiantang River is extraordinary, a wonder of the world, and everyone who sees it can't help but ask: how did such a magnificent tide come about? Why is it that among the many rivers in the world that rush into the sea, only the Qiantang River is the most famous?

In fact, tidal surges are not uncommon, and can be seen in many estuaries, such as the Amazon River, the Severn River in the United Kingdom, the northern branch of the Yangtze River, and so on. Speaking of which, the tide of the Qiantang River is not the first in the world, and it is not as strong as the Amazon River in South America: in terms of tidal difference, it is slightly inferior to the Bay of Fundy in North America

First of all, because of the huge bell mouth topography of Hangzhou Bay, which is wide outside and narrow inside, and there is a gradually rising sand ridge at the mouth of the Qiantang River, when a large amount of tide comes, both sides and three sides of the water are constrained, the tide rushes in, the front is blocked, and the back wave comes, so the surging tide is formed. The Bay of Fundy, on the other hand, is a rectangle in shape and does not form a large tidal wave. Although the strength of the Amazon River is a fight with the Qiantang River, its tidal form is far less varied than the Qiantang River, so only the Qiantang River tidal tide in the world can be called the first wonder of the world.

The original Qiantang River did not have a bell mouth, nor can you see the surging tide, it is the vicissitudes of life gradually evolved, this unique natural wonder happened to be formed at 30 degrees north latitude, and added a bit of magic to this area.

The formation of the tide is related to the moon and the sun, and the tidal force of these celestial bodies will attract seawater, but the moon and the sun will always move, so the tidal force will also change periodically, so there are high tides and low tides, and the terrain around the Qiantang River is a trumpet shape with a large mouth and a small bottom, and the water rises up, but the river channel passing through is getting narrower and narrower, so it can form a large wave.

<> Qiantang River. The estuary is wide on the outside and narrow on the inside, resembling a trumpet. in Hangzhou Bay.

The mouth of the bay (Wang Panyang) is about 100 kilometers wide, but it is in Yanguan Town, Haining.

Nearby the river, only about a few kilometers. When a large amount of tidal water from the open sea pours into the narrow channel, the water surface in the bay will quickly rise to a high level, and the flow of water from the Qiantang River will be blocked, making it difficult to leak out, which in turn will promote the increase of the water level. On the other hand, when the tide enters the Qiantang River, a sand barrier across the estuary becomes a wall, causing the tide to move forward suddenly and the tide behind it to quickly surge up, forming a back wave.

Pushing the front waves, the tide will become more and more high, and the tide will be formed.

In addition, in the coastal areas of Zhejiang, southeast winds often blow between summer and autumn, and the direction of the wind is roughly the same as the direction of the tide rush, which also contributes to its momentum. Many favor high tides.

The factors are concentrated in the Qiantang River estuary, especially in autumn, so the autumn tide there has become a rare wonder in the world.

The reflection turned back, where it violently slammed into the embankment on the opposite side of the defeat, and then rolled back with the momentum of Mount Tai and fell on the westward rushing rapids, forming a row of "collapsed and trembling snow-capped mountains," and rushed back to the east at a galloping speed, with a sound like a lion's roar, earth-shattering, and this was the tide of return. Hope, I hope Zhipei can help you, hope, thank you.

The formation of the tide is related to the moon and the sun, and the tidal force of these celestial bodies will attract seawater, but the moon and the sun will always move, so the tidal force will also change periodically, so there are high tides and low tides, and the terrain around the Qiantang River is a trumpet shape with a large mouth and a small bottom, and the water rises up, but the river channel passing through is getting narrower and narrower, so it can form a large wave.

The cause of the Qiantang tide.

Celestial time: From the 16th to the 18th day of the eighth month of the lunar calendar, the sun, the moon, and the earth are almost in a straight line, so the tidal gravitational force on the sea water on this day (the difference between the gravitational attraction of the moon, the sun or other celestial bodies on the earth's unit mass object and the gravitational force of the earth's centrium on the earth's centroid (sun), or the resultant force of the inertial centrifugal force generated by the earth's movement around the earth-moon (sun) center of mass and the moon's (sun) gravity. Maximum.

Geographical advantage: It is related to the trumpet-shaped shape of the Qiantang River estuary. Nearly 500,000 acres of reclamation land to the east of Zheshan on the south bank of the Qiantang River block the estuary like a peninsula, so that the Qiantang River Zheshan to the outer 12th section resembles a bottle with a big mouth and a small mouth, the tide is easy to enter and difficult to retreat, the outer mouth of Hangzhou Bay is as wide as 100 kilometers, only a few kilometers wide to the outer 12th section, 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 it has to push the back wave to the front wave, layer upon layer.

Secondly, it is also related to the sediment under 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 catching up with the front wave, and the wave on top of each other.

Winds: Southeasterly winds often blow along the coast, and the direction of the wind is roughly the same as the direction of the tide, which contributes to the tide.

1.Plate movement, occurrence of ** crack 2Meteorite impact.

Weak. Magical skills. Born.