Introduction to the Yellow River:
Located in the north of China, the Yellow River is one of the longest rivers in the world and the second longest river in China. The yellow of the Yellow River is actually sediment. The ancient book says: "The Yellow River fights water, and mud ranks seventh." 90% of the sediment of the Yellow River comes from the Loess Plateau, where the soil is loose and easy to erode and disperse. Whenever it is washed by heavy rain, it will lose a lot of soil and water and flow into the Yellow River.
The Yellow River originates from the Yogu Zonglie Basin at the northern foot of Bayan Kara on the Qinghai-Tibet Plateau, flows through nine provinces (autonomous regions) of Qinghai, Sichuan, Gansu, Ningxia, Inner Mongolia, Shanxi, Shaanxi, Henan and Shandong from west to east, and finally flows into the Bohai Sea. The total length of the Yellow River is about 5,464 kilometers, and its basin area.
Geological impact:
The gestation, birth and development of the Yellow River are controlled by geological processes in geological history. The tectonic movements caused by crustal changes are external forces, and the erosion, transportation and accumulation generated by itself under hydrogeological conditions are internal forces. In the historical process of becoming a river, it keeps moving forward and keeps pace with the times.
Soil erosion in the Loess Plateau and sediment deposition in the lower reaches of the Yellow River began in prehistoric geological times, and have been increasingly influenced by human activities since then. According to various studies, the ancient Yellow River has three stages of development: the early Pleistocene from Tertiary to Quaternary is the gestation period of the ancient Yellow River. In the middle Pleistocene of Quaternary, the ancient Yellow River was born. In the late Pleistocene, the Yellow River formed a marine water system from 654.38+million years ago to 654.38+million years ago.
General situation of river basin:
The Yellow River basin starts from Bayan Kara in the west, reaches Yinshan Mountain in the north, Qinling Mountain in the south and Bohai Sea in the east. The inland potential in the basin is high in the west and low in the east, and the height difference is very large, forming three steps with high in the west and low in the east. The highest step is the Qinghai Plateau where the source of the Yellow River is located. It is located in the northeast of the Qinghai-Tibet Plateau, the famous roof of the world, with an average elevation of more than 4,000 meters.
There are a series of mountains in the northeast, southwest and east, such as Qilian Mountain in the north, Animaqing Mountain in the south and Bayan Kara. The Yellow River twists and turns among the mountains in an "S" shape. The mountains on both sides of the valley are 5500 ~ 6000m above sea level, and the relative height difference is1500 ~ 2000 m.