History of wind power levels

Wind is a very common natural phenomenon, but can you accurately tell the level of the wind and judge the size and direction of the wind? Have you ever wondered who is the first person in the world to grade the wind power at this time?

Li, an outstanding astronomer in the Tang Dynasty, was the first person to classify the wind power. Li, Tang Gaozong Taishiling, is both an astronomer and a mathematician. He participated in the annotation of Zhou Jie (Bi) Suanjing, the earliest work of mathematics and astronomy in China, which made the ancient books such as Ten Suanjing spread to this day. In 733 AD, he also made a new type of ecliptic steel instrument, and at the same time wrote a seven-volume book "Fa Xiang Zhi", which discussed "the difference between the gains and losses of the previous dynasty" (Old Tang Shu Li Chuan). In addition, he also wrote the earliest monograph "The Second Self" in the world meteorological history.

Based on his many years' wind measurement experience and the influence of wind on trees, Li created eight wind standards in "B Own Occupation", namely: 1- moving blades; Level 2-singing (that is, the wind blows the tree and the branches and leaves make sounds); Level 3-shaking trees; Level 4-defoliation; Level 5-Broken branches; Level 6-breaking big branches; Level 7-broken wood, flying stones; Level 8-uproot trees and roots. Plus no wind and weak wind *** 10. In addition, Li also developed the wind direction from 8 directions to 24 directions. This practical and scientific classification has made outstanding contributions to world meteorology. More than 400 years later, British scholar Beaufort further subdivided the wind power according to the standard of dividing wind power contained in Li's "B occupied", and set the wind power from zero to 12 *** 13. Since then, the wind level has been more clearly defined. Today's weather forecast is based on this standard.

/kloc-at the end of 0/9, instruments for measuring wind speed have been invented, people can accurately measure the magnitude of wind power, and vehicles have also developed from the ground to space. In this way, the requirements for wind measurement are more stringent, and people need to know the specific values, so the wind level is measured by the distance the wind travels in one hour or one second.

In 1950s, people measured that the wind in nature actually exceeded 12, so the wind level was increased to 17, but some winds, such as tornadoes, had a wind speed of 100 to 200m per second, far exceeding 17. However, this devastating disaster has a small weather range and is rare.