Where was the mouth of the Yangtze River in ancient times? Where is the mouth of the Yangtze River?

The Tuotuo River in the Winter Snow Mountains of Gradan.

The Yangtze River originated from the Yanshan movement in the Jurassic period 100 million years ago, forming the Tanggula Mountains in the lower reaches of the Yangtze River, and the Qinghai-Tibet Plateau was slowly elevated, forming many high mountains and deep valleys, depressions and rift valleys. The middle and lower reaches of the Yangtze River, the Dabie Mountains and the Wushan Mountains between Sichuan and Hubei were uplifted, the Sichuan Basin was sagging, and the ancient Mediterranean Sea retreated further to the west. 100 million years ago in the Cretaceous period.

The Sichuan Basin is slowly rising. The razing effect continued to develop, and the Yunmeng and Dongting basins continued to sink. In the Eocene 30 million to 40 million years ago, the strong Himalayan movement, the uplift of the Qinghai-Tibet Plateau, the disappearance of the ancient Mediterranean, and the general intermittent rise of the Yangtze River basin.

The degree of its rise is moderate in the east and sharp in the west. The high mountains on both sides of the Jinsha River protruded, and the Qinghai-Tibet Plateau and the Yunnan-Guizhou Plateau were significantly uplifted, and some fault basins were formed at the same time. The strong downward cutting of the river has led to the emergence of many deep and steep canyons, and the water systems that originally flowed from north to south merged with each other and flowed eastward.

The middle and lower reaches of the Yangtze River rise slightly, forming middle and low mountains and hills, and the low depression areas sink into plains (such as the Lianghu Plain, Nanxiang Plain, Duyang Plain, Suzhou-Anhui Plain, etc.). By 3 million years ago, the Himalayas were strongly uplifted, and the western part of the Yangtze River basin was further uplifted. The erosion of the ancient Yangtze River, which extends from Hubei to the four basins, accelerates and cuts through Wushan, making the ancient Yangtze River in the east and west penetrate into one breath, and the river water is mighty and flows into the East China Sea, and today's Yangtze River is formed.

At present, it is recognized that the Tuotuo River, which originates from the Winter Snow Mountain of Gradan, is the source of the Yangtze River; However, the criteria for determining the source of a large river are those that are far away, the amount of water is large, and correspond to the main direction of the river. Some people, including experts in geography and surveying, believe that the water flow of Dangqu is 5 to 6 times that of the Tuotuo River, and the area of the river basin is twice that of the Tuotuo River. Dangqu should be used as the source of the Yangtze River. The dispute over the source of the Yangtze River will have a substantial impact on the calculation of the length of the Yangtze River.

The Yangtze River is the largest river in China and the third largest river in the world. The latitude and longitude of the estuary is (121°E 31°N) 2,000 years ago, the Yangtze River entered the sea near Zhenjiang and Yangzhou, in the form of a funnel-shaped estuary bay, and the distance between the north and south is about 180km. By the Jin Dynasty (265 AD), the Yangtze River estuary extended to the vicinity of Jiangyin, the tidal area boundary was near the Jiujiang River, and Chongming Island was out of the water in the early Tang Dynasty (618 AD), and the current situation of the Yangtze River estuary was formed after the Tang and Song dynasties.

Since 1842, there have been nautical charts at the mouth of the Yangtze River. In the past 100 years, the width of the north and south of the Yangtze River Estuary (Subeizui and Nanhuizui) has narrowed from 118km to 90km, and the underwater delta has gradually extended to the sea, and the -5m line has generally extended 5-10km seaward (the maximum extension distance outside the South Port is 14km), and the tidal boundary has moved down to Datong, Anhui. As the estuary extended, the river gradually narrowed.

In the historical period, the width of the Zhenyang River and the Jiangyin River was more than 10km, and now they have been reduced to and; In 1915, the width of the Nantong River was still 18km, and in 1920, the river narrowed to about the south bank of the Liuhai Shahe River. The narrowing of the width of the Xuliujing River is a matter of recent decades, and the original 13 km wide river surface has been narrowed after the Tonghaisha and Jiangxinsha were successively reclaimed into land. The narrowing of the Yangtze River estuary is characterized by the parallel bank of sandbanks or dark sand, and the riverbed tends to be stable by dividing the waterway into a single channel. Historically, the Yangtze River estuary has been crossed by sandbanks seven times.

Except for the last two when evolution was accelerated by human factors, the remaining five were the result of natural evolution.

From Datong, Anhui Province (the boundary of the dry season tidal area), down to the front edge of the underwater delta.

Yangtze River Estuary. Located in the north of Shanghai, it is about 232 kilometers long from the goose nose mouth in Jiangyin, Jiangsu Province to the chicken bone reef at the mouth of the sea. The plane of the Yangtze River estuary is trumpet-shaped, with a width of one kilometer at the narrow end of the river and a width of 90 kilometers at the wide mouth. The Yangtze River ends up on Chongming Island.

It flows east into the East China Sea, and the Yellow River flows into the Bohai Sea.

The main stream of the Yangtze River at the mouth of the Yangtze River is joined by the Huangpu River.

Liuhe, Lianqi River, etc. is a stretch made up of islands.

A multi-tributary section of the river divided by a sandbar. It is mainly composed of the north branch, the south branch, the north port, the south port, the north trough, and the south trough. The modern geography finally took shape at the beginning of the 20th century and continues to expand.

The Yangtze River Estuary is the gateway of the Yangtze River to the sea and ocean shipping, with many waterways and ports, laying the foundation for the economic prosperity of Shanghai and eastern Jiangsu, and the Yangtze River Estuary region has developed rapidly since the beginning of the 20th century, and has gradually become one of the fastest economic development areas in China.

The west end of the Yangtze River estuary is about 9 kilometers wide, and the east end of the Yangtze River is 90 kilometers wide from Qidongzui to Nanhuizui. in the river.

Under the mutual agitation of the rising tide of the East China Sea, the sediment continues to accumulate, forming sand islands at the mouth of the rivers of Chongming, Changxing and Hengsha, as well as numerous shoals and dark sands. Chongming Island divides the Yangtze River into two waterways: the northern branch of the Yangtze River estuary is now narrowing, the water is salty, the river channel is shallow, and the shipping value is decreasing; The southern branch of the Yangtze River estuary is waterway by Changxing Island.

Hengsha Island is divided into two branches, namely the Nangang Waterway and the Beigang Waterway. The Nangang waterway is bounded by nine sections of sand and is divided into the south and north trough waterways. The shallowest part of the Nangang Waterway is about 7 meters deep, and it is the only channel for sea vessels to enter and exit Shanghai.

【大江南北】:d à jiāng nán běi, refers to the vast area bordering the banks of the middle and lower reaches of the Yangtze River. as a subject, object, and definite; It refers to the Yangtze River area.

大江东去】:d à jiāng dōng qù, the water of the Yangtze River rushes eastward. Later, it was borrowed as the name of the word brand. It mostly means that the old traces have disappeared and history has moved forward. as an object; A metaphor for history moving forward.

Turn the river and stir the sea]: fān jiāng jiǎo hǎi, to describe the vast potential of the water. The power or momentum of metaphor is very strong. It is also described as being very noisy or messing up. as a definite, adverbial, and complement; Describe the immensity of the water.

Jianghan Dynasty Sect]: jiāng hàn cháo zōng, 江汉: refers to the Yangtze River and Han water; Chaozong:

The princes met the Son of Heaven and borrowed the metaphor of a hundred rivers entering the sea. Refers to the flow of rivers into the sea. It is also a metaphor for nightmares, the trend of the times, and the aspirations of the people.

as an object, a definite; The metaphor is the general trend.

江翻海倒]: jiāng fān hǎi dǎo, the Yujiang River turns the sea boiling. Describe the immensity of the water. It is often used as a metaphor for strength or momentum. as a predicate, a definite; Used in figurative sentences.

江翻海boil]: jiāng fān hǎi fèi, describing the vast potential of the water. It is often used as a metaphor for strength or momentum. as an object, a definite; Used in figurative sentences.

Turn the river and pour the sea]: fān jiāng dǎo hǎi, originally described as rainy, and later described as very strong or powerful. as a definite, adverbial, and complement; Describe the immensity of the water.

指点江山]: zhǐ diǎn jiāng shān, 指点: criticism; Jiangshan: refers to the country. Refers to criticism of national events. as a predicate, a definite; Refers to criticism of national events.

stirring the sea and turning the river]: jiǎo hǎi fān jiāng, stirring: stirring; Flip: Flip. The river and the sea are churning. The metaphor is powerful or powerful. as a predicate, a definite; Refers to the loud voice.

The ancient name of the Yangtze River, also known as the Great River, after the Six Dynasties, was commonly known as the "Yangtze River".

Summary. The Yangtze River Estuary is one end of the Yangtze River and is also included.

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Including, the Yangtze River Estuary is a section of water of the Yangtze River at the mouth of the East China Sea, which is about 232 kilometers long from the goose nose mouth in Jiangyin, Jiangsu Province, to the chicken bone reef at the mouth of the sea.

Including, the Yangtze River Estuary is a section of water of the Yangtze River at the mouth of the East China Sea, which is about 232 kilometers long from the goose nose mouth in Jiangyin, Jiangsu Province, to the chicken bone reef at the mouth of the sea.

The Yangtze River Estuary is one end of the Yangtze River and is also included.

The length of the Yangtze River was measured from **?

The estuary is here, where the edge of the East China Sea meets the Yangtze River.

Don't stay up late to study for too long, the body is the capital of the revolution, and you must take care of yourself.

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Is the length of the Yangtze River from the mouth of the Yangtze River to the Tanggula Mountains?

The southwest side of Geladan Winter Peak in the Tanggula Mountains of the Qinghai-Tibet Plateau.

The southwest side of Geladan Winter Peak in the Tanggula Mountains of the Qinghai-Tibet Plateau.

The length of the Yangtze River does not include the Yangtze River estuary?

Yes, of course.

Didn't you just say that?

Does Mount Everest belong to the Tibetan Plateau?

It belongs to both the Tibetan Plateau and the Himalayas.

Which county is the source of the Yangtze River and the source of the Yellow River in Qinghai?

The source of the Yellow River and the source of the Yangtze River are together. It is located at the junction of Qumalai and Zaduo and Zhiduo counties in Yushu Prefecture, Qinghai Province, China.

5000 6000 years ago, the location of the Yangtze River estuary was about Zhenjiang and Yangzhou. The bustling Yangtze River estuary was still a big bay at that time!

For five or six thousand years, the Yangtze River estuary has been moving eastward mainly due to the accumulation of sediment. The Yangtze River has a long history, the amount of water is particularly abundant, a large amount of sediment is brought to the estuary every year, especially after the Sui and Jin dynasties, the mountainous areas of the Yangtze River basin carry out large-scale reclamation, slash-and-burn farming, destroy the forest, so that the soil is eroded, the sediment of the Yangtze River is increasing day by day, a large amount of sediment is piled up in the bay below Jiangyin, more and more, gradually exposed to the sea, become the current delta, leaving only the shell sand belt buried in the ground, made the witness of the ancient Yangtze River estuary.

The Yangtze River Estuary is a section of water of the Yangtze River at the mouth of the East China Sea, which is about 232 kilometers long from the goose nose mouth in Jiangyin, Jiangsu Province, to the chicken bone reef at the mouth of the sea. The Yangtze River estuary has a unique configuration, with a trumpet-shaped plane, with a width of one kilometer at the narrow end of the mouth and a width of 90 kilometers at the wide mouth. 6000 7000 years ago, the mouth of the Yangtze River was a drowning valley-shaped estuary bay, and the top of the bay was in Zhenjiang and Yangzhou.

In the past 2,000 years, the beach on the south bank of the estuary has been advancing seaward at an average speed of 1 km in 40 years, and there are sand islands on the north bank that have been merged one after another, and the width of the mouth gate has been narrowed from 180 km to 90 km.

Analysis of deflection forces by geostrophation:

The Yangtze River is the largest river in our country, and its Yangtze River basin has abundant precipitation, large water volume in the main stream, and strong erosion. Therefore, at the beginning, the Yangtze River estuary waterway was divided into two branches, south and north, by the estuary sand bar, and the north and south were symmetrical; On the surface of the earth, as long as the object moves in the horizontal direction, it will be affected by the geostrophic deflection force, and the Yangtze River flows from west to east all the year round, under the action of the long-term geostrophic deflection force, the river channel deviates to the right, thereby eroding the south bank, so that the north bank waterway is constantly silted, because the right bank (south bank) is eroded by the river water, the days are long, and the delta, swamp and beach on the north bank of the Yangtze River (left bank) are connected together, and finally it develops into today's vast triangular landform. From this, it can be analyzed that the ancient Yangtze River estuary should be located in the south of the present-day area.