Why is the Weihe River in Tianshui divided into two halves?

The reason why the Weihe River in Tianshui is divided into two halves is as follows:

I. Reasons

1. Because the sediment concentration of the two rivers is different. The water mirror originated in Ningxia and flows through the Loess Plateau, with serious soil erosion, carrying a large number of yellow sand to meet the Weihe River, resulting in clear distinction and clear turbidity.

2. With different seasons, the movement and sediment concentration of the two rivers will change. In summer, the flow velocity and sediment concentration of rivers will increase, making the boundary not obvious; In winter, the rainfall is less, the sediment concentration is reduced and the boundary is obvious.

Second, Weihe River.

1, Weihe River, formerly known as Weishui, is the largest tributary of the Yellow River. Originated in Bird and Rat Mountain in Weiyuan County, Dingxi City, Gansu Province, it spans eastern Gansu and central Shaanxi, mainly flows through Tianshui in Gansu Province, Baoji, xianyang, Xi and Weinan in Guanzhong Plain of Shaanxi Province, and joins the Yellow River in Tongguan County, Weinan City. The total length of the main stream is 8 18km, and the total drainage area is 134766km2.

2. The main tributaries of Gansu Province are Chyi Chin River, Daxian River, Sandu River, Yilong River, Bangshahe River, Sandu River, Hulu River, Hejie River and Niutou River. Shaanxi has Qingjiang River, Qingshui River, Fayu River, Shitou River, Xitangyu River, Heihe River, Laoyu River, Xinhe River, Fenghe River, Zaohe River, Bahe River, Zero River, Bahe River, Chishui River, Yuxian River, Luowen River, Luofu River, Tongguan River and Xiaoshui River.

3. Jinling River, Heqian River, Qishui River, Jinghe River, Shichuan River and Beiluo River. Weihe river basin is connected to east-west Qinling mountains in the south and Liupanshan barrier in the north. Weihe river basin can be divided into loess hilly and gully region in the west and Guanzhong plain region in the east.

Three. final

1. The average annual runoff of Weihe River is 7.57 billion cubic meters, and that of Shaanxi Province is 5.38 billion cubic meters. The distribution of runoff area is uneven, and the general trend is decreasing from south to north, which is higher in Qinling and Guanshan areas and lower in the original and valley areas. The west is bigger than the east, and the middle reaches are richer than the downstream.

2. The runoff modulus of the northern slope of Qinling Mountains is 9 ~ 15 L/s km2, while that of the original loess area is only 0.8 ~ 2.2 L/s km2. Only He Qian has a higher runoff modulus, and Qianyang Station has a runoff modulus of 4.66 L/s square kilometers. The runoff modulus of the main stream of Weihe River is 2.5 ~ 3.7 L/s square kilometers, among which Weijiabao and Xianyang stations are higher, which is caused by the addition of tributaries.