One person who was killed and one person was missing.

According to the China Youth Daily, on July 31, the dangerous situation on the east side of the third seawater bath in Shinan District, Qingdao City. Two young men around 20 were involved in the sea and disappeared in the sea. At 12:35 on August 1st, the water rescue brigade salvaged one of the tourists ashore, and was confirmed that there was no life signs by medical staff.

At present, the Water Brigade is cooperating with public security and civil rescue teams to search for another tourist.

Video production: Science and Technology Daily reporter Zhao Weihua

After being overturned by the long waves, the tourists encountered offshore flow

Weibo science blogger@微 微 Zheng Yuan said in an interview with a reporter from the Science and Technology Daily that there were three reasons for the accident:

The first is that tourists have made danger and ran to the seawall to play water.

The second is that although Typhoon Sanda is weak, it can also stimulate the long waves. These long waves have limited influence on the sea, but they are stimulated by terrain on the shore and may increase the wave high. The waves overturned.

Third, after the two tourists were overturned by the long waves, they encountered offshore flow and could not avoid being brought into the deep sea.

Popular science ↓↓↓

Long waves are waves from other sea areas, which are often caused by typhoons. From the perspective of appearance, this wave is not very different from the general waves, but it often occurs when there is no wind and rain, and it may suddenly increase or crushed due to terrain reasons. It has great confusion and lethality.

The offshore flow will be involved in the outer sea within a few minutes

The offshore flow encountered by these two tourists, also known as cracking flow, is essentially a kind of compensation flow. It is a kind of water flow that seawater pushes to the shore to accumulate and converge.

The offshore flow often occurs suddenly, the water flow is rapid, and people are involved in it. It will be involved in a deep sea in a few minutes, which is very dangerous.

Offshore flow formation mechanism. Figures of the School of Ocean and Earth Sciences of Tongji University

Due to the high dynamics and strong instability of the offshore flow, the time and location of the occurrence of offshore flow accurately cannot be realized. However, based on experience analysis and long -term observation statistics, professionals can predict the possibility of offshore flow from risk and probability.

Generally, tourists can also try to predict and identify offshore flow through the naked eye:

The offshore flow distance from waves and waves is very close to tourists. Image source: Marine Disaster Redemption Center of Natural Resources Department

The white waves are interrupted or the relatively calm waters of white foam and sediment drift towards the sea.

It is easier to see the offshore flow from standing at a height.

Low tide and big waves are more likely to produce offshore flow. Please check the local tide and wave forecast before going to the beach.

The shallow sand trough, sea cricket, reef, or dam near the offshore flowing area.

Don't struggle when you get involved in the offshore flow

If you fall into the offshore flow, you must calm down and keep your physical strength. After the water flows slightly, he strives to swim in the direction of the water vertically, leaves the offshore flow, and then swim back to the shore or call for help.

"Once it is involved in the offshore flow, it is recommended that you relax and drift smoothly, and don't struggle." Wang Gang, the captain of Xiamen Shuguang Rescue Team, emphasized. Do not try to swim back to the shore, and it is easier to get out of trouble in the direction parallel to the coast.

A video teach you

How to save yourself from being involved in the offshore flow ↓↓↓

Video/Snapshot, T_100, F_JPG, M_fast "Controls =" Controls "data-version/ueditor/video/mp4/20220803/16594937441870.MP4 "transcoding =" 1 "style =" width: 400px; "> Video comes from national emergency broadcasting

Go to the beach, don't care about it,

Be sure to pay attention to these points:

Be sure to play in designated sea areas and mature scenic spots. Do not turn over the sea fels without authorization.

When the typhoon approaches, don't go to the beach even if there is no wind and rain.

When you go to the beach, you first communicate with the lifeguard to understand the sea conditions, and look for the offshore stream police sign, and try to swim or surf the survivor within the sight of the lifeguard.(Source: Science and Technology Daily WeChat public account)

Edit: Zhang Yu

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