Hongfeng will arrive in Wuhan in two or three days. What does this mean?

I believe you will know from watching the news recently that many places are suffering from floods. The news you saw today is about Hongfeng, which is about to arrive in Wuhan. So, do you know what this flood peak means? Bian Xiao, I will give you an answer!

Hongfeng will arrive in Wuhan in 2-3 days. According to Changjiang Daily 12, it was learned from Changjiang Water Conservancy Commission that the flood peak will pass through Hankou, Jiujiang and Datong River in the next 2-3 days.

According to the forecast of Hydrology Bureau of Yangtze River Committee, the flood peak water levels of Jiujiang and Hukou stations were about 23.00 meters and 22.65 meters respectively on July 3, and the flood peak water levels of Hankou and Datong stations were about 29.00 meters and 16.30 meters respectively on July 4. This round of flood peak water levels of main control stations along the Yangtze River will be in the forefront of history.

The national emergency response to flood control was upgraded to the second level.

According to CCTV news, at 12 16, the water level at Hukou Station of Poyang Lake was close to the guaranteed water level of 22.50 meters. According to the relevant provisions of the National Emergency Plan for Flood Control and Drought Relief, after consultation and judgment, the National Defense General decided to upgrade the flood control level III emergency response to level II.

As of July 12 12, the flood disaster has affected 37.89 million people in 27 provinces (autonomous regions and municipalities) such as Jiangxi, Anhui, Hubei and Hunan, 14 1 people died and disappeared, and 2.246 million people were resettled urgently./kloc-. 28,000 houses collapsed; The affected area of crops is 3532 thousand hectares; The direct economic loss was 82.23 billion yuan.

What does the peak water level mean? How to define 0 1 flood peak? A flood peak usually occurs when there is a flood.

Flood peak is divided according to the number of floods, which refers to the highest point in the process of water level or discharge of each flood. At the peak, the flood flow is the largest.

If the rainfall per unit area is greater than the water flow, the rain will accumulate bit by bit, and once the basin is wide and long, it will form a flood peak.

On July 7, the flood passed through the city of Qijiang. On that day, Qijiang District of Chongqing ushered in the fourth flood peak this summer.

A flood peak is like the highest point of a big wave. When the flood peak appears, the lateral pressure of the river will increase, which will have a certain impact on the dike. The higher the flood peak water level, the greater the dam pressure.

The water level corresponding to the flood peak, called the flood peak water level, can be determined by simulating the water level line with a hydrological model or directly measured by a hydrological station.

How to determine the intensity of flood? According to the national standard "Specification for Hydrological Information Forecast" implemented since 2009,

According to the return period of flood elements less than 5 years, 5-20 years, 20-50 years and more than 50 years, floods are divided into four grades: small floods, medium floods, large floods and extraordinarily large floods.

The flood elements for estimating the return period include the peak water level (discharge) or the maximum flood volume in this period, which can be selected according to the hydrological characteristics of the river (reach).

On July 8, Xin 'anjiang Reservoir opened 9 holes for flood discharge. At 10 in the morning, the water level of Xin 'anjiang Reservoir108.42m has exceeded the flood limit level of10.92m and continues to rise.

It should be noted that the flood intensity is a frequency, not a flood once every 50 years, but only once every 50 years. For example, a flood frequency of 0.05 corresponds to a 20-year flood, and a frequency of 0. 1 corresponds to a flood of 10.

Fortification water level, warning water level and guaranteed water level refer to the water level at which river embankments have begun to enter the flood control stage in flood season, that is, after the river flood inundates the beach, the embankments begin to face the water, and flood control personnel need to patrol and defend.

At this time, the dike management unit entered the flood control stage from the daily management work, and began to organize personnel to patrol the dike to check risks and check the implementation of pre-flood preparations.

The fortification level is determined by the flood control department according to historical data and the actual situation of the dike.

That's all for the explanation of flood peak. For this flood peak, it will soon arrive in Wuhan. Everyone must be prepared for the rainstorm, and you must pay attention to safety when you go out in rainy days!