How to write a paper with rainstorm and flood disaster as the main topic —— Taking 20 12 Beijing as an example

2012 July 2 1 day, Beijing was hit by a rainstorm. The average precipitation of this heavy rainfall is as high as 70mm, and the death toll is as high as 78, which makes me extremely shocked. I really want to know: what kind of rainstorm is this? Why is it so big? If there is a rainstorm, how can we save the day? So, I began to explore.

By consulting the information, I know that rainstorm is a heavy rainfall with a precipitation of more than 50 mm within 24 hours. Rainstorm is a kind of disastrous weather, which often causes floods and serious soil erosion, leading to major economic losses, such as engineering accidents, dike breaches and crop flooding. Especially for some low-lying and blocked areas, rainwater can't be discharged quickly, which leads to water accumulation in farmland and supersaturation of soil moisture, which will lead to more geological disasters. Rainstorms often fall from cumulonimbus clouds. The condition for the formation of cumulonimbus clouds is that the atmosphere contains enough water vapor, and there is a strong upward movement to transport the water vapor rapidly upward. The water droplets in the cloud are constantly affected by the upward movement until the upward airflow can't support them, and they fall sharply to the ground.

Cumulonimbus clouds are usually very large. Cumulonimbus clouds are precipitation units in rainstorm areas. Although the horizontal range of each unit is only 1 ~ 20km, they are arranged in a rain belt with a width of 100 ~ 200km. Cumulonimbus clouds are like mountains, like mountains When they develop strongly, they extend from the height of 0.4 ~ 1 km above the ground to the height of 10 km. The higher the altitude, the lower the temperature, often reaching MINUS 10 degrees Celsius or even lower, and the water droplets at the top of the clouds will freeze. On the ground, people can see wisps of white bands at the top of the cloud with naked eyes, which is the result of ice crystals and snowflakes dancing in the sky. It is rainy summer on the ground, but snowy winter in the sky.

Before the rainstorm comes, the following preparations should be made: 1. Check the house. If it is a dangerous old house or a low-lying place, move out in time. 2. Suspend outdoor activities, and the school can suspend classes temporarily. 3, check whether the circuit, fire control and other facilities are safe, and turn off the main power switch. 4. Cover the items that are aired in the open air in advance, and put the valuables at home on the stalls or high places. 5, suspend field work, outdoor personnel should immediately to the heights or caves.

Through this exploration, I feel that the rainstorm is actually not terrible, mainly because you will reduce the damage caused by the rainstorm.