The favorable conditions for developing agriculture in the Yarlung Zangbo River basin, why is it rainy in the Yarlung Zangbo River basin?

The Yarlung Zangbo River basin is 3000-4000 meters above

The favorable conditions for developing agriculture in the Yarlung Zangbo River basin, why is it rainy in the Yarlung Zangbo River basin?

The Yarlung Zangbo River basin is 3000-4000 meters above sea level, with abundant sunshine and is not affected by the cold wave in winter. The southwest monsoon from the Indian Ocean often blows warm and humid air from the downstream valley, with an annual rainfall of about 200-350 mm. The valley is rich in pasture and developed in animal husbandry, making it the main agricultural base in Tibet. Most of the middle and upper reaches of the Yarlung Zangbo River are wide valleys, about 10- 15 km wide. The river flows eastward through a big bend near 95 east longitude and passes through the Himalayas, and the flow direction has turned completely in the opposite direction, that is, it flows northeast first, then turns southwest after passing through the mountains.

First, the favorable conditions for agricultural development in the Yarlung Zangbo River basin.

1, the Yarlung Zangbo River basin is about 3000-4000 meters above sea level, where there is plenty of sunshine and winter is not affected by the cold wave. The southwest monsoon from the Indian Ocean often blows warm and humid air from the valley downstream, making the annual rainfall here about 200-350 mm. The valley is very lush with pasture and developed animal husbandry, making it the main agricultural base in Tibet.

2. The middle and upper reaches of the Yarlung Zangbo River are mostly wide valleys, about10-15km wide, and the river flows eastward for 95? Near the Great Bend, it passes through the Himalayas, and its flow direction turns completely in the opposite direction, that is, it flows northeast first, then turns southwest after passing through the mountains. The riverbed slope in this section is very large, and the hydraulic resources are relatively concentrated and abundant, which is a rare grand canyon in the world.

The valley is flat, with long sunshine, strong radiation, rainy nights and warm summer and winter. It is an important food crop in Tibet? The main producing areas of highland barley. In recent years, many growers have planted winter wheat on a large scale in this valley, and the main towns in Tibet are also located here.

Second, why is it rainy in the Yarlung Zangbo River Basin?

1. The rainy weather in the Yarlung Zangbo River basin is mainly influenced by local topographic conditions in addition to the wide-ranging weather situation. In the Yarlung Zangbo River basin, the solar radiation on the hillside during the day is relatively strong, the heating area is large, and the temperature rises rapidly, forming a low-pressure area; If the heating area of the valley is small and the temperature rises slowly, a high pressure area will be formed. The airflow rises from the valley to form a valley wind, and a steamed bun-shaped cumulus cloud is formed in the sky. In daytime, the solar radiation is too strong, and the water droplets in the clouds are easy to absorb heat, evaporate and dissipate, so the clouds become thinner, resulting in cloudy skies or clear skies in Wan Li.

When the sun goes down, the ground will cool down quickly, and the hillside will also cool down quickly. The cold air sinks and lifts the warm and humid air in the valley, which increases the atmospheric disturbance and provides conditions for rainfall. Coupled with the rapid cooling of the cloud top at night, the low-level temperature is relatively high, the convection is strengthened, and the instability in the cloud is increased, which will be conducive to the condensation of water vapor bubbles and eventually form rainfall.

3. There are two main reasons for the formation of the Yarlung Zangbo River basin. First, the internal force: located at the junction of the Eurasian plate and the Indian Ocean plate, it is a fault zone formed by the collision of the two plates; Second, external force: it is formed by erosion of the Yarlung Zangbo River.