Environmental impacts caused by hydroelectric production
1. Natural Aspects: Huge reservoirs can cause surface activity and even cause earthquakes. In addition, they can also cause hydrological changes in the basin, such as downstream water. levels. Reduction or reduction of upstream sediments, etc. After the completion of the reservoir, due to high evaporation, the climate is cooler and more stable, and precipitation decreases.
2. For land animals, the completion of the reservoir Ultimately, large numbers of wild animals and plants could drown and die, or even disappear. For aquatic animals, once the reservoir is built, fish will be affected due to changes upstream. ecological environment
leading to extinction or population reduction. At the same time, due to the expansion of upstream water areas, the habitats ofe certain organisms (like snails) have increased, creating conditions for the spread of some. regional diseases (such as schistosomiasis).
3. Physical and chemical properties: The water flowing into and out of the tank changes physical and chemical properties such as color and odor, as well as the density, temperature and even solubility of the water in each layer of the tank is different. The water temperature of the deep water is low, and the organic matter at the bottom of the sediment tank cannot be completely oxidized and undergoes anaerobic decomposition, as well as the carbon dioxide content of the tank. the water mass increases significantly.
The advantages and disadvantages of photovoltaic solar power generation are compared to commonly used thermal power generation systems. The advantages of solar photovoltaic power generation are mainly reflected in: ① Ano risk of exhaustion; Safe and reliable, no noise, no polluting emissions, absolutely clean (no pollution); ③ Not limited by the resource distribution area, the advantages of building roofs can be used ④ It can generate electricity and provide electricity on site without consuming fuel or erecting; transmission lines; ⑤ high power quality; ⑥ easy for users to accept emotionally; ⑦ short construction period and little time to obtain energy. Disadvantages: ① The energy distribution density of irradiation is low, that is, it occupies a huge area; ② The energy obtained is related to the four seasons, day and night, cloudy and sunny and other weather conditions; The origin and development of photovoltaic solar energy production