China has entered the flood season. What changes does it mean to enter the flood season?

? Flood season? It is a water conservancy term, which refers to the period when the river water rises regularly in a year. Due to seasonal precipitation or glacier melting, the time when the river water level continues to rise is called flood season. ? Flood? Mainly to express the appearance of abundant water, encounter? Flood season? It's not the same as a flood, but floods usually occur in? Flood season? . Sometimes, the water is too concentrated at the same time, which is easy to form floods.

Due to the differences in geographical location and meteorological system, the seven rivers in China naturally have certain differences in flood season. There are also early and late years in Tongjiang. In China, according to different seasons, it can be divided into peach blossom flood (spring flood), summer flood (summer flood), autumn flood and ice flood. Generally, it is larger in rainy season and autumn. Generally speaking, the flood season mainly refers to two flood seasons. The main flood season refers to the period when these two flood seasons are particularly prone to floods.

Entering the flood season, the weather has changed a lot. During the main flood season, China's atmospheric convection activities are frequent, heavy precipitation is concentrated, and disasters such as storms and floods occur from time to time. At the same time, under the background of climate change, high temperature and extreme weather have also increased, and strong convective weather such as thunderstorms, strong winds and hail has occurred frequently. So the change of weather will attract more people's attention.

In addition to high temperature and heavy rain, there are also high temperature and heat waves. The weather forecast generally takes the daily maximum temperature reaching or exceeding 35℃ as the high temperature standard. High temperature heat wave? Also known as high temperature and summer heat, it is a meteorological term, which usually refers to a meteorological disaster with adverse effects due to the long duration of high temperature when the high temperature exceeds 35℃. The standard of high temperature heat wave is mainly based on the influence or harm degree of high temperature to human body.

In order to prevent floods scientifically and efficiently, it is necessary to know the common types of disasters in flood season. Natural disasters in flood season can be summarized as meteorological disasters, flood disasters and geological disasters, mainly caused by precipitation. Flood disasters are local and sudden, with heavy rainfall and severe disasters, often accompanied by strong winds and hail, causing natural disasters such as flash floods, river surges and mudslides.

Combined with factors such as rainstorm and flood, the date of flood season is determined by rainfall and water level. Precipitation index refers to the coverage area where the accumulated rainfall area exceeds 50 mm for three consecutive days. The starting and ending time of flood season varies greatly from place to place. July to August is the most frequent period of floods in China.

Generally, before the rainstorm comes, the relevant departments will issue warning signals from weak to strong to the society, and divide the warning signals into four grades, which are represented by blue, yellow, orange and red respectively. According to these early warning information, people can grasp the meteorological changes in advance and prepare for bad weather such as rainstorm in flood season.