Hail hail particles have large kinetic energy, which will cause serious losses to agricultural production, and sometimes even lead to the failure of fruit production and grain harvesting. In many areas of my country, artificial hail prevention has been carried out to avoid and reduce hail disasters. However, artificial hail prevention is difficult and costly.
Now there is another anti-hail idea, which is to cover the crops with a layer of anti-hail nets. One is to intercept them. The anti-hail net can intercept all hailstones with a diameter greater than or equal to the mesh of the hail-proof net on the net, so that they cannot cause damage to vegetables. The second is the buffering effect. After the hail with a diameter smaller than the mesh falls, it collides with the hail net wire. Most of the kinetic energy of the hail falling is absorbed by the hail prevention net, which plays a buffer role. After the second fall, the kinetic energy of the hail becomes very small, and the kinetic energy of hitting the vegetables again Not enough to cause damage to vegetables. Due to the uneven force on all sides when setting the net, the mesh size is rarely quadrilateral, but mostly rhombus. On the other hand, hail is mostly accompanied by strong winds during the landing process. The smaller the hail, the greater the influence of the wind. If the net is not set up, the windward side of the fruit ears will be severely damaged after the hail falls, and the leeward side will be lighter, and the hail will hit the line at a certain angle during the landing process. Therefore, the actual probability of collision of the hail net will be much higher than the theoretical value; in the end, only a few hail will pass directly through the mesh.