Typhoon fireworks, I came in person

2021-07-30 | Earth Knowledge Bureau Original Collection1 |

On July 20, 2021, Zhengzhou in the semi-humid area will experience heavy rain. Within a day from 2am on the 20th to 2am on the 21st, the precipitation in the middle of the previous year was completed.

In one day, the heavy rain quickly turned into a disaster

Status at 4pm on July 20▼

The cause of this abnormal weather is complicated, and various factors coincidentally make it a bit bizarre. Because the subtropical high moves northwardly, the humid southeast monsoon and southwest monsoon occupy most of China's monsoon region. However, Zhengzhou is a strong transporter of water vapor.Thousands of kilometers apart, when the fashion was east of Taiwan Island, the typhoon "Fireworks" near the Pacific Ocean Kuroshio.

Although it is far away, it passes through a fast water vapor corridor

I still moved the rain on the sea to the top of Zhengzhou▼

Mankind sums up experience and optimizes organization in the process of fighting against natural disasters. With the progress of the times, the ability to deal with natural disasters is getting stronger and stronger. However, even if mankind develops to this day, this kind of incredible abnormal climate will still be naturalComplexity and human fragility are exposed.

Fireworks are coming▼

Rain belt all the way north

Actually, the heavy rain started in Henan on the 17th. After many days of high-intensity rainfall, especially the unexpectedly heavy rain on the 20th, the power facilities of Zhengzhou, Luoyang, Xuchang, Jiaozuo, Nanyang, Pingdingshan and other cities were damaged., More than 800 urban power distribution lines and more than 980,000 households are affected.

Short-term heavy rain caused power outages and grids in multiple areas

Severely affect the normal life of residents and the operation of the city

Picture: Cotton▼

On the 21st, the rain in Zhengzhou gradually decreased, and part of the time began to clear. The worst and most unpredictable period of the disaster has passed, but the stagnant water has not faded away, and there are still large-scale water and power outages in the urban area. Long after the disasterThe stage of rescue, clean-up, and restoration of the order of production and life has just begun.

The scars left by the disaster to the city will take months or even longer to repair

Picture: Cotton▼

The rain in Zhengzhou has cleared. It does not mean that the rainstorm is completely over, because the various factors that led to the rain have not changed. The sub-high is still far from the northeast-North Korea line. After the strong typhoon fireworks left the KuroshioAlthough it was quickly degraded to a typhoon, the wind was still strong. The humid southeast wind and the southwest wind, which were affected by the typhoon and went deep inland, met near Xinxiang, which is more norther than Zhengzhou, and converged, resulting in a large precipitation cloud system.As a result, the rain belt gradually moved west and north, avoiding the urban area of ​​Zhengzhou.

Yes, the focus of precipitation has shifted, and Zhengzhou has begun to spare no effort in disaster relief

But in Yubei, the real pressure has just begun

especially Xinxiang, Weihui, Hebi, Anyang at the foot of Taihang Mountain

Status at 8pm on July 21▼

The pressure of disaster prevention in Zhengzhou City is gradually reduced, but for western Henan and northern Henan where the level of urbanization is lower, the distribution of residents is more dispersed, and the infrastructure construction is weaker, greater challenges have just begun at this time.

Heavy rains appeared in Nanyang, Henan on the 22nd. Then the precipitation accelerated northward. By the 23rd, the precipitation was mainly concentrated in the western and northwestern parts of Henan. Xinxiang began to become the most concentrated area of ​​Henan from 8:00 on July 17th.At 7 o'clock on the 23rd, the average rainfall in Xinxiang City was 830 mm, far exceeding the average annual rainfall of 500 mm. As of that day, the precipitation in Xinxiang had not completely ended.

22-23, heavy rainfall is still concentrated in northern Henan and southern Hebei

These small towns in front of the Taihang Mountains are under extreme pressure

Reference: Central Meteorological Observatory▼

Whether it is the sewage system in the city, or the streams and ditches in the country, they are naturally formed or constructed in order to cope with the rainfall in a normal year. When a heavy rainstorm occurs in an area, it will inevitably exceed the maximum drainage systemLoads cause serious drainage delays. However, heavy rains can easily damage the original drainage system, cause poor drainage and delay the speed of drainage. Therefore, even if the heavy rains have ended, the stagnant water will continue for a period of time.

When there is too much water, there is actually nowhere to drain...

Now the drainage equipment and personnel are also working overtime to solve the stagnant areas one by one

Picture: Cotton▼

As the rainfall gradually converges into the river, the water level of the river may still rise after the rain passes and the weather is clear. When the water level of the upstream reservoir is too high, in order to ensure the safety of the reservoir, the flood discharge is often selected.It will increase further. The rain in Henan has been intermittently for nearly ten days, and the flood control pressure can be imagined.

The northern Henan and southern Hebei under the Taihang Mountains are too difficult▼

Xinxiang is on the edge of Weihe River, and Weihe River has its own particularity. This river originates from Taihang Mountain, with a large drop in the upper reaches, short river course and rapid water flow. After flowing out of the mountainous area, it quickly enters the flat flood plain, and then the river course bends, Forming a u-shaped bend.

Weihe River that flows to Xinxiang after stepping out of Taihang Mountain the picture below can be slid

Actually, the river is relatively narrow, and a flood is likely to overflow

Picture: google map▼

These factors lead to greater flood hazards during the flood season of Weihe River. However, the water volume of Weihe River is usually not large, and the river channel is relatively shallow. Some river sections may even see the bottom of the river. Now it is encountering heavy rains, upstream flooding,The influence of river restrictions and other factors eventually led to serious floods.

In the past, it was just a "small water ditch" in the eyes of coastal residents

At this time, I have to take on the responsibility of flood discharge

Correspondingly, it has become a water diversion vehicle for flooding homes and fields

Picture: Li Pingan/Pi Chong Creative▼

As of the 27th, this rare heavy rainfall caused 13,319,800 people in 150 counties cities, districts in Henan Province, 1573 townships, and 10,171,000 hectares of crops were affected, of which 148.1 thousand hectares had no harvest. "Fireworks" causedThe rain is still not over.

Behind disasters and data, it is even more tragic when it comes to individuals

Picture: Network▼

A typhoon is a weather system with a very wide range of influence. Even if the center of the typhoon is in the coastal area, the peripheral airflow at its edge will continue to affect eastern Henan and bring rainfall to Henan. However, with previous experience, all walks of life in Henan havePreparations for a new round of rainfall will be more adequate, and the losses will surely be minimized.

22-23, the rain brought by the typhoon fireworks personally swept across eastern Henan

Reference: Central Meteorological Observatory▼

Jiangsu and Zhejiang with double pressure

"Fireworks" landed on the coast of Putuo, Zhoushan, Zhejiang Province at around 12:30 on the 25th, and then entered Hangzhou Bay. Directly affected by the typhoon, strong winds appeared in the surrounding areas, with gusts up to level 9 in some areas, and the maximum wind even reachedAt the same time, it also brought strong typhoon rain to the surrounding areas. Among them, the Dingjiafan Weather Station in Dalan Town, Yuyao, Zhejiang Province, measured the accumulated rainfall of 951 mm from 08:00 on the 22nd to 06:00 on the 26th, which exceeded Zhejiang Province.The extreme value of the typhoon and rain.

25-26, heavy rain concentrated around Hangzhou Bay

Continue to move northwest afterwards

Reference: Central Meteorological Observatory▼

The essence of a typhoon is a tropical depression. The center of the typhoon is the center of the depression. The path of the typhoon is also related to the surrounding air pressure. Now the subtropical high pressure is located more northeast than in previous years, and its ability to guide airflow is weaker.The continental high pressure located in the northwest and the subtropical high near the Korean Peninsula interacted with each other, forming a saddle-shaped area.

Under the control of the two high-pressure centers and other typhoons, the typhoon "Fireworks" appeared to be slow and slow. It made landfall again in Pinghu City, Jiaxing, Zhejiang at about 9:50 on the 26th. Between the two landingsIt took 21 hours to walk for 130 kilometers of the road. The slow movement and the successful launch of Hangzhou Bay also continued for its life. As the sixth typhoon this year, it has successfully survived the seventh and eighth typhoon.

From 25th to 26th, "Fireworks" has been around Hangzhou Bay

At that time, the precipitation was mainly concentrated around Hangzhou Bay

Now mainly concentrated in the north

The picture below shows the rainfall distribution on July 28▼

In order to deal with fireworks, Zhejiang initiated a first-level response to typhoon prevention. As of July 25, the Zhoushan Cross-sea Bridge was closed. All scenic spots and public cultural places in Hangzhou were closed, buses were suspended, and subways were subject to speed limits or suspensions depending on the wind power level.Transportation measures, a total ban on shipping, and all flights have been cancelled. Some subway and bus lines in Ningbo have been suspended, and all flights have been cancelled.

Emergency response is divided into four levels: Ⅳ, Ⅲ, Ⅱ, and Ⅰ from low to high

When the forecast will have a particularly significant impact, the first-level emergency response will be initiated

Picture: Zhejiang Weather▼

Shanghai and Jiangsu, which are across Hangzhou Bay from Zhejiang, initiated secondary emergency response. On the 24th, measures were taken to suspend all ferry services, temporarily close down the Bund area, relocate more than 230,000 people, and stop some trains. ToOn the 26th, it followed up the suspension of all high-speed rails, cancellation of flights, suspension of some subway lines, or reduction of operation. Some areas of Jiangsu Province also introduced measures to stop public transportation.

Coastal areas are visited by Taiwan scenery more than once a year

Picture: yummy418/Picture Worm Creative▼

Compared with Henan, which is deeply inland, Jiangsu and Zhejiang obviously have more experience in the face of typhoons. Take Zhejiang as an example. In 2019, the super typhoon "Lichma" was once in Zhejiang.Stayed for up to 20 hours. It brought near-record strong winds and precipitation to Zhejiang the record was kept at that time by the super typhoon "Sangmei" in 2006. While the typhoon brought damage to Zhejiang, it also allowed Zhejiang to accumulate defenses.Disaster mitigation experience. At the same time, because as early as 20 days before the typhoon landed, the heavy rainfall in Zhengzhou has attracted national attention and increased the importance of coastal areas.

Typhoon "Limaqi" caused heavy rainfall to Jiangsu, Zhejiang, Shanghai, Anhui, Shandong, and Liaoning

Due to the impact of a major disaster, he was delisted afterwards

Picture: Wiki▼

At the same time, the average annual rainfall in Jiangsu and Zhejiang is greater than Zhengzhou. In addition, the economy is relatively developed and the funds are more abundant. There are more trial and error experiences brought by typhoons in previous years. Therefore, the relevant local infrastructure is relatively complete to deal with typhoons.Also naturally more orderly.

The price of monsoon zone

With the help of the powerful communication power of the mobile Internet, this meteorological disaster has attracted the attention of people across the country. In fact, in the pre-mobile Internet era, typhoons and heavy rains are also not uncommon, and they occur almost every summer. Meteorological disasters that occur from time to time, Is the reality that people living in the monsoon climate zone have to face.

A lot every year, I have been used to it for a long time

It’s really bad to mess around, but it’s worse not to come

Picture: NASA▼

The monsoon climate zone has sufficient heat and rainfall for at least half a year. The climate determines that the local biodiversity is very high, with a large number of species suitable for domestication, and has great potential for the development of agriculture. Therefore, the monsoon climate zone has been available since the birth of agriculture.With the advantages of development, a large number of people are concentrated. China and India, the two countries with the most extensive monsoon climate, were once synonymous with prosperity in the agricultural era.

East Asia, Southeast Asia, South Asia, extending out of the world's largest monsoon area

It is also the most densely populated area in the world

The annual precipitation brought by the monsoon is the key foundation of its population and economy▼

But behind the prosperity, there is another costly aspect. The monsoon climate is affected by a combination of many factors, and there are too many variables that can cause changes. Therefore, the inter-annual variation of precipitation is large, and the overall climate is not unstable. In recent years, climate changeIntensified, this unstable state is likely to intensify.

India, which is often affected by tropical cyclones in the Bay of Bengal and the Arabian Sea

The harm to climate change is even more profound

picture: shutterstock▼

According to the data of the Global Disaster Data Platform, in the past ten years, there have been 1416 flood disasters in the world. The most frequently affected countries are concentrated in East Asia, Southeast Asia and South Asia. Among them, China ranks first with 96 times, and Indonesia ranks first with 96 times.Ranked second on 80 times, India ranked third on 70 times, Filipinos ranked fourth on 43 times, Brazil ranked fifth on 38 times, and the United States and Pakistan tied for sixth on 35 times.

Remember the flood in the Yangtze River basin last year

At that time, the monsoon rainfall was concentrated on the Yangtze River, while the north was quite lack of water

Reference: Central Meteorological Observatory▼

At the other extreme drought, the United States has ranked first in 7 times in 10 years, and China has ranked second in 6 times. The United States is also the country with the most frequent tropical storms, with 139 occurrences in 10 years, and China has100 times ranked second.

It is not difficult to see that China is one of the countries where meteorological disasters occur most frequently. In fact, not only does disasters occur frequently, but the losses are also very large.

In the past ten years, floods alone have affected 240 million Chinese people, nearly half of the world’s population affected by floods in the past ten years. Direct economic losses were US$115.4 billion, accounting for one-third of the world’s economic losses from floods in the past ten years.The destructive power of extreme weather is evident.

Accurate forecast, timely warning, preparation in advance, etc.

Still a powerful means to reduce the impact of extreme weather

Picture: kenpqyp.dfic/Picture Worm Creative▼

There is a hypothesis that the advanced political organization in ancient China was to deal with the frequent meteorological disasters of the monsoon climate. Our ancestors have used thousands of years to adapt to and transform the environment.

But this process is not over. With climate change, floods in the monsoon region may appear more frequently. In the past ten years, China has become the country with the most frequent floods. Disaster prevention and mitigation are constantly changing with climate change.I am afraid the overweight long-term struggle will continue.

cherish life, laugh at life

Picture: kenpqyp.dfic/Picture Worm Creative▼






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Cover: shutterstock


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