Reasons for the increase of sediment concentration in the upper reaches of Nenjiang River in spring

There may be the following reasons for the increase of sediment concentration in the upper reaches of Nenjiang River in spring:

1. Melting of snow and ice: Spring is the season when the temperature gradually warms up. At this time, the snow and ice began to melt, and a lot of water flowed into the water system. If there is a large amount of snow or the temperature is too low in previous years, the amount of snow melting in spring will be relatively large, resulting in an increase in river sediment concentration.

2. Agricultural activities: Spring is an important season for agricultural production, and farmers need to carry out activities such as spring ploughing, sowing and irrigation. These activities will lead to the loosening of the soil on the surface of the land, leading to the loss of nutrients and microorganisms in the soil into the river and increasing the sediment concentration of the river.

3. Wind erosion in spring: the temperature gradually warms up in spring, and the breeze blows on the face, which will make the soil and fine particles on the river bank dispersed by the wind and enter the river, increasing the sediment concentration of the river.

4. Glacier meltwater: Glaciers on the Qinghai-Tibet Plateau began to melt in early spring, and a large amount of meltwater flowed into the water system. If there is a large amount of snow or the temperature is too low in previous years, the amount of snow melting in spring will be relatively large. In addition to the above points, there may be the following reasons for the increase of sediment concentration in the upper reaches of Nenjiang River in spring:

5. Strong wind erosion: In spring, the temperature gradually warms up and the wind gradually increases, which will blow away the soil and fine particles on the river bank and enter the river, increasing the sediment concentration of the river.

6. Human activities: Spring is the tourist peak season, and a large number of tourists come to visit, which leads to a large increase of garbage, pollutants and other substances around the tourist attractions in the upper reaches of Nenjiang River, and enters the downstream areas with the flow of river water.

Natural factors: Natural factors in the upper reaches of Nenjiang River will also affect the sediment concentration in spring. For example, dry weather and land desertification will lead to the loss of nutrients and microorganisms in the soil to rivers and increase the sediment concentration in rivers.