Wind is one of the environmental factors in agricultural production. Moderate wind speed plays an important role in improving the environmental conditions of agricultural land. Near-surface heat exchange, evapotranspiration from agricultural land, and carbon dioxide and oxygen transport processes in the air accelerate or intensify as wind speed increases. Wind can spread pollen and plant seeds, helping plants pollinate and reproduce. Wind energy is a widely distributed and inexhaustible energy source. The monsoon prevailing in China is beneficial for the growth of crops. On the Inner Mongolia Plateau, the Northeast Plateau, the Southeast Coast and the Inner Mountains.
Wind can also have a negative effect on agriculture. It can spread pathogens and spread plant diseases. High altitude windsare the weather conditions that allow pests such as armyworms, rice leafhoppers, rice leafrollers and migratory locusts to migrate long distances. Strong winds can cause mechanical scratching of leaves, lodging of crops, broken trees and falling flowers and fruits, thereby affecting yields. Strong winds also cause soil erosion, shifting sand dunes and damage to agricultural land.
Indiscriminate rehabilitation in arid areas will lead to land desertification due to wind. Strong winds and snowstorms in pastoral areas can disperse herds and worsen frost damage. Certain particular characteristics of local winds often cause wind damage. Salty tidal winds blowing from the sea, as well as high and low temperature foehn winds andhot, dry winds, all seriously affect the flowering and fruit setting of fruit trees as well as the filling of cereal crops.
Detailed informationWind is a natural phenomenon caused by air flow, caused by the heat of solar radiation. Sunlight shines on the earth's surface, causing the surface temperature to increase. The air on the surface expands under the influence of heat, becomes lighter and rises. Once the warm air rises, the cold, low temperature air enters laterally. The rising air gradually cools, becomes heavier and becomes smaller. The higher surface temperature heats the air and causes it to rise.
From a scientific point of view, wind often refers to the component of horizontal air movement, including direction and magnitude, that is, the direction and wind speed, but for flight it also includes vertical movement; component, the so-called vertical or lifting airflow. Strong winds can move objects and change their direction (mass of matter). The wind blows very quickly.
Reference materials:
1. Wind energy production will harm the local ecological environment, for example by destroying vegetation, changing topography, causing soil erosion and desertification.
2. Electromagnetic radiation produced by wind power generation affects human habitation. In wind power generation systems, generators, substations, transmission lines, etc. are the main causes of electromagnetic radiation. When the receiving device attached to the wind farm receives the signal, it will receive the electromagnetic wave signal reflected from the wind turbine blades.
The reflected signal is a delayed signalard, which may have a greater impact on the AM radio system; At the same time, the rotation of the turbine blades will also produce a phase shift signal, which may impact the FM radio system. The material the blades are made of will also interfere with electromagnetic waves. If the blades are made of metal materials, it will cause serious electromagnetic interference.
In addition, an alternating electromagnetic field will form around high-voltage transmission lines. The radiation field causes electrostatic induction relative to the ground, causing radio interference and affecting human health.
3. Wind energy affects the local climate. Wind energy uses wind energy present in the atmosphere. According to the law of conservation of energy, the consumption and production of one type of energy must produce or consume another type of energy. Therefore, wind turbinesThe electricity production process must consume part of the wind energy present in the atmosphere. As an important factor in climate change, changes in wind energy will inevitably lead to climate change.
When some offshore wind farms and inland wind farms are operating, if the humidity is relatively high, a huge tail of water vapor will condense behind the wind turbine, which may affect the local microclimate, such as humidity, sand and dust have an impact.
4. Wind turbine blade damage is prone to accidents when the wind turbine blades are exposed to strong winds above 25 m/s (wind speed cut off), although the wind turbine is stationary. However, due to the limited bending moment, torque, shear resistance and extrusion that the blade root can withstand, in severe cases the entire blade may fly away.
Causese casualties and damage to buildings on the road (although wind turbines are mainly located in coastal areas with sparsely populated areas). In addition to extreme winds, blade surface corrosion, lightning strikes, ice cover, cracks, etc. can occur. can easily cause blades to break, causing accidents and affecting public safety.
5. Noise risks linked to wind energy production. For a wind turbine of such size, when the huge blades rotate (one blade requires a special long collapsible truck to transport), noise is inevitable.
Wind blade noise can be roughly divided into three categories.
1. Thick noise, produced by the compression of the air and the blades. In windy weather, when we close the doors and windows, we often hear a sharp, harsh sound, which sounds like a ghost. crying or a howling wolf? , coupled with thegloomy sky outside, it's still a little scary to think about it.
2. Load noise, as the name suggests, is caused by the blades carrying a large load.
3. Impulse noise is generated when the Mach number is close to 1. In this way, the impact of noise on the environment cannot be ignored.
Detailed information
Risk response measures:
1. The construction of a wind power plant requires preliminary planning. It should be far from feasible. residential areas and avoid environmentally sensitive areas.
2. Improve the design level of wind power generation so that it can be well integrated into the environment.
3. When developing wind power generation, environmental, economic and social effects must be considered comprehensively, and any of them cannot be ignored. The impact on the surroundingment must be reasonably taken into account in both its positive and negative aspects.
Baidu Encyclopedia-Wind Energy