The Yangtze River originated from the Yanshan Movement in the Jurassic Period 140 million years ago. The Tanggula Mountains were formed in the lower reaches of the Yangtze River. The Qinghai-Tibet Plateau slowly rose, forming many high mountains, deep valleys, depressions and rift valleys.
Mountains such as the Dabie Mountains and the Wushan Mountains between Sichuan and Hubei rose in the middle and lower reaches of the Yangtze River, the Sichuan Basin sank, and the ancient Mediterranean Sea further retreated to the west.
The Cretaceous Period 100 million years ago.
The Sichuan Basin rises slowly.
The leveling effect continues to develop, and the Yunmeng and Dongting basins continue to sink.
During the Eocene 30 to 40 million years ago, intense Himalayan movements occurred, the Tibetan Plateau rose, the ancient Mediterranean disappeared, and the Yangtze River Basin generally rose intermittently.
The degree of rise is gentle in the east and sharp in the west.
High mountains protrude on both sides of the Jinsha River, the Qinghai-Tibet Plateau and Yunnan-Guizhou Plateau rise significantly, and some fault basins are formed at the same time.
The strong downward incision of the river has created many deep and precipitous canyons. The water systems that originally flowed from north to south merged with each other and flowed eastwards.
The middle and lower reaches of the Yangtze River rise slightly, forming middle and low mountains and hills, and the low-lying areas sink into plains (such as Lianghu Plain, Nanxiang Plain, Duyang Plain, Jiangsu and Anhui Plains, etc.).
By 3 million years ago, the Himalayas were strongly uplifted, and the western part of the Yangtze River Basin was further raised.
The erosion of the ancient Yangtze River extending from Hubei to the Four Basins accelerated and cut through Wushan, connecting the east and west ancient Yangtze Rivers. The mighty water of the river poured into the East China Sea, and today's Yangtze River was formed.
Edit this paragraph length It is currently recognized that the Tuotuo River originating from the Gradandong Snow Mountain is the source of the Yangtze River; but the criteria for determining the source of a large river are that the source of the river is far away, the water volume is large, and it corresponds to the main direction of the river.
Some people, including experts in geography and surveying and mapping, believe that the water flow of Dangqu is 5 to 6 times that of the Tuotuo River, and the drainage area is 1.8 times that of the Tuotuo River; Dangqu should be regarded as the main 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.
In 2001, the Institute of Remote Sensing Applications of the Chinese Academy of Sciences, under the leadership of expert Liu Shaochuang, used satellite remote sensing image measurement and calculation, and the measurement results of the Yangtze River Basin Geographic Information Atlas (22 photos) were accurate to the decimal point.
The new length of the Yangtze River was measured to be 6211.3 kilometers.
The research team used nearly 40 satellite images covering the main stream of the Yangtze River. The satellite images were taken by the U.S. Earth Resources Satellite with a resolution of 30 meters.
The calculation method measures the forward direction of the Yangtze River three times and the reverse direction three times along the center line of the river. The result is obtained after multiple computer operations and geometric corrections.
This study was calculated using Dangqu as the source of the Yangtze River. Specifically, the source location of Dangqu is 94 degrees 35 minutes 54 seconds east longitude, 32 degrees 43 minutes 54 seconds north latitude, and 5042 meters above sea level.
Dangqu (from the source to Nangji Bayong) is 360.8 kilometers, Tuotuo River is 357.6 kilometers, Tongtian River is 787.7 kilometers, Jinsha River is 2322.2 kilometers, and Yibin is 2740.6 kilometers below.
Edit the depth of this section. The depth of the Yangtze River in the Tanggula Mountains varies. The following is the water depth of the main channel: Yibin - Lanjiatuo 1.8 Milanjiatuo - Louxigou 2.5 meters Louxigou - Yangjiaotan 2.7 meters Yangjiaotan - Baiwei 2.9
Mibaiwei - Wuqiao 3.2 meters The source of the Yangtze River is the Tuotuo River, followed by the Tongtian River and the Jinsha River.
Below the Jinsha River, from the mouth of the Minjiang River to the mouth of the Yangtze River, it is 2,884 kilometers long (after the Jingjiang River was cut and straightened, the voyage was shortened by 80 kilometers to more than 2,800 kilometers), commonly known as the Yangtze River.
Each section of the Yangtze River, commonly known as the Yangtze River, has its own name.
Wuqiao - Wanhe Estuary 4.0 meters Wanhe Estuary - Yanziji 4.5 meters Yanziji - Longzhaoyan 10.5 meters In 1958, during experiments in the area of ??the Wuhan Yangtze River Bridge on the Yangtze River, the water depth in the river was measured to be more than 30 meters. At Xiaguan Pukou
A depth of 40 meters has been measured at one time, and a depth of 103 meters has been measured at a place called Niuguanji at the junction of Jiangxi and Hubei. However, the depth of the Yangtze River Estuary is only about 10 meters, which sometimes even affects normal navigation.
Edit this paragraph of historical materials In ancient Chinese documents, "jiang" is often used to refer specifically to the Yangtze River.
Wang Xizhi and Sun Chuo of the Eastern Jin Dynasty were the first to use the name "Yangtze River".
Wang Xizhi wrote to Yin Hao: "Now the army is defeated outside and its resources are exhausted inside. The ambition to protect the Huaihe River cannot be restored, and there is no better way than to protect the Yangtze River!" ("Book of Jin·Biography of Wang Xizhi");
Said: "Before Tian Zuo was abolished, Zhongzong Long Fei not only trusted and obeyed the heaven and man, but also relied on the ears of the Yangtze River to draw thousands of miles." ("Jin Shu Biography of Sun Chuo") Edit the map of the Yangtze River Basin in this section (
The Yangtze River Basin (Administrative Region) is about 3,219 kilometers from west to east and more than 966 kilometers from north to south.
The Yangtze River flows through: Qinghai-Tibet Plateau - Qinghai (Qinghai) - Sichuan (Sichuan) - Tibet (Tibet) - Yunnan (Yunnan) - Chongqing (Chongqing) - Hubei (E) - Hunan (Hunan) - Jiangxi (Jiangxi) - Anhui (Wan)
)-Jiangsu (Su)-Shanghai (Shanghai)-East China Sea.
Originating in western China, it flows completely or partially through 11 provinces and autonomous regions, including the Tibet Autonomous Region.
The population distribution in the Yangtze River Basin is uneven; the most densely populated areas are in the plains adjoining both sides of the Yangtze River and its tributaries in central and eastern China, while the plateau areas in the western part of the basin are the most sparsely populated.
More than 3/4 of the process passes through mountainous areas.
There are important tributaries such as Yalong River, Minjiang River, Jialing River, Tuojiang River, Wujiang River, Xiangjiang River, Hanjiang River, Ganjiang River, Qingyijiang River and Huangpu River.
Among them, the Han River is the longest, and those to the north of the main stream are the Yalong River, the Min River, the Jialing River and the Han River.
To the south of the main stream are the Wujiang River, Xiangjiang River, Yuanjiang River, Ganjiang River and Huangpu River.