The Yellow River basin flows from high to bottom, right?

The Yellow River basin flows from high to bottom. The Yellow River Basin is vast, and the topography varies greatly. From west to east, it spans four geomorphological units: the Qinghai-Tibet Plateau, the Inner Mongolia Plateau, the Loess Plateau and the Huang-Huai-Hai Plain.

The topography of the basin is high in the west and low in the east, and the average altitude of the western river source area is more than 4000m, which is composed of a series of high mountains, perennial snow cover, and glacial landform development. The altitude of the central region is between 1000 and 2000 m, which is a loess landform with serious soil erosion. The eastern part of the country is mainly composed of the alluvial plain of the Yellow River, and the river channel is high above the ground, and the threat of flooding is greater.

The Yellow River originates in the ancient Zonglie Basin at an altitude of 4,500m above sea level at the northern foot of Bayankala Mountain on the Qinghai-Tibet Plateau, flows through nine provinces (regions) including Qinghai, Sichuan, Gansu, Ningxia, Inner Mongolia, Shaanxi, Shanxi, Henan, and Shandong, and finally flows into the Bohai Sea in Dongying City, Shandong, with a total length of 5,464 km in the main stream.

The Yellow River basin runs through the east and west of China, with most of the area located in the northwest of China. It is located between 95°53 119°05 east longitude and 32°10 41°50 north latitude, with a length of 1900km from east to west, a width of 1100km from north to south, and a basin area of 10,000 square kilometers.

Not only in the Yellow River Basin, but all rivers flow from high to low.

The lower reaches of the Yellow River are called above-ground rivers, and because the riverbed is high, the direct flow cannot be flowed into, so although there is a lot of precipitation below, there are few tributaries, and the basin area is very narrow.

bOn the river.

The Yellow River has a large sediment content, in case of heavy rain, a large amount of sediment and rainwater together, into the Yellow River, out of the Loess Plateau, the Yellow River flows into the lower plain area, the river channel widens, the slope slows down, the flow speed slows down, a large amount of sediment is deposited at the bottom of the river, so that the riverbed is gradually raised, and it is difficult for other rivers to flow into the Yellow River. So there are few tributaries and the area of the basin is small.

Answer, b

Because the downstream is mostly "above-ground rivers", the riverbed is higher than the ground, and the surface water cannot flow into the river, so there are few tributaries and the basin area is narrow.

The downstream channel widens, the slope slows down, and the flow rate slows down to form the Qingkai River.

According to education-related data, the Yellow River flows into the lower plains, because the river channel widens, the slope slows, the flow rate decreases slowly, and a large amount of sediment is deposited at the bottom of the river, so that the riverbed is gradually raised and becomes an above-ground river.

The Yellow River is one of the longest rivers in the world and the second longest river in China (also known as the second largest river).

The reason why there are few tributaries and narrow basins in the lower reaches of the Yellow River is that the riverbed in the downstream flow area is higher than the ground on both sides and is constrained by the river embankment. To put it simply: the lower reaches of the Yellow River are formed by the impact and accumulation of sediment, the terrain is low and flat, due to the high sediment content in the Yellow River, when the Yellow River water flows to the lower reaches of the terrain, the flow rate slows down, the sediment sinks, and the accumulation forms an "above-ground river".

The lower reaches of the Yellow River are 786 kilometers long and the basin area is only 10,000 square kilometers, accounting for 3% of the total basin area. The total drop of the downstream section is meters, and the average specific drop is reduced; The increase in the amount of water in the interval accounts for the amount of water in the Yellow River. Due to the large amount of sediment in the Yellow River, the downstream section of the river has been silted up for a long time to form the world-famous "hanging river on the ground", and the Yellow River is confined in the embankment and becomes the watershed between the Haihe River basin and the Huaihe River basin. Except for the Dawen River flowing into it from Dongping Lake, there are no large tributaries in this section of the river.

Except for the low mountains and hills between Dongping Lake on the south bank and Jinan, the rest of the river section is retained by embankments, with a total length of more than 1,400 kilometers. Historically, the breaches of the lower reaches of the river flooded frequently, bringing heavy disasters to the annihilation of the blind Chinese nation. As the lower reaches of the Yellow River flow from southwest to northeast, the northern part of the river freezes first in winter, resulting in the formation of Lingxin.

Flooding can easily lead to the blockage of ice dams, causing the embankment to overflow, and the threat is also serious. Dismantle.