Typhoon Highsun passing by'as if passing by'... Both rain and wind damage increase

Let's take a <Anchor>

expert and first look at the characteristics of this typhoon, the expected damage, and what to pay attention to.

Professor Joo Jin-geol is here.

[Jin-Gol Joo/Professor of Department of Civil Engineering, Dongshin University: Somehow, the area adjacent to the center of the typhoon and the areas along the path of the typhoon inevitably increase the damage.

There are concerns about damage caused by typhoons in Gyeongsang coastal areas such as Busan, Pohang, and Ulsan, and Gangwon coastal areas such as Gangneung and East Sea.

In particular, a lot of damage occurred 3 or 4 days ago due to typhoon Mysak, and there are many areas that have not yet been restored.

In these places, it is expected that the damage will increase due to this typhoon.]

[Jin-Gol Joo/Professor of Civil Engineering, Dongshin University: In fact, it is closer to the center of the typhoon, so if you land, you can only predict that the damage will be greater.

However, this time, it is expected that the original forecast will pass, so I don't think the fact that the landing will have much significance for the damage.

Looking at typhoon damage in the past, the amount of damage caused when a typhoon penetrated the inland was 70% of the damage caused by wind and about 30% of the damage caused by rain.If it passed the Korean Strait, that is, it would not have penetrated the inland. In some cases, the wind was 20%, the rain was 80%, and the rain was more.

Typhoon No. 10 is a situation where there is a concern that both rain damage and wind damage will be large because it passes inland as if passing through inland, so it passes as if after landing.]

[Jin-Gol Joo/Professor of Civil Engineering, Dongshin University: I think the amount of rain will have an influence on the atmosphere and the direction of typhoons, rather than landing or not.

Therefore, it is difficult to predict in advance such as more or less rainfall depending on whether or not it lands. It is important to pay close attention to the forecast of the Meteorological Agency because the forecasts of the Meteorological Agency change from time to time.]

[Jin-Gol Joo/Professor of Department of Civil Engineering, Dongshin University: Basically, if the high tide time and the typhoon overlap, the damage inevitably increases when it overlaps with rain as well as typhoon.

The damage is aggravated in two aspects, both flood damage and storm surge damage.

At high tide, the sea level rises, so water in rivers cannot easily escape into the sea during a flood.

That's called the drainage effect, because the seawater is so high that the river water cannot easily escape into the sea, so even the rainwater that falls in the urban area inside the embankment cannot escape into the river.

This can increase the inland water and flooding of urban lowlands, and also increases the risk of river flooding.

In the case of the second storm surge, it is known that sea level rises from 50 cm to 1 m in low-pressure locations such as typhoons.

The sea level rises because there is no pressure against atmospheric pressure.

The first sea level rises, the sea level rises again due to high tide, and the swelling waves increase by 2 to 3 times due to the next storm.

In this way, a big wave of 10m or more will be generated, as in the previous typhoon Mysak No. 9, and a big wave will occur.

Then, the storm and tsunami is expected to cause damage to the downtown area near the coastal area.]

[Jin-Gol Joo/Professor of Civil Engineering, Dongshin University: In the past, large flood damage and flood damage that occurred in coastal areas often overlap with high tide.

Therefore, it seems that you should pay attention to prevent damage from this typhoon.]

[Jin-Gol Joo/Professor of Civil Engineering, Dongshin University: Yes.

Actually, there are many places where the damaged sites have not been restored.

So, it would be easy to understand if you think that the things we are preparing for damage in case of a disaster are wearing armor.

They are wearing armor and defending against disasters against this external force, but they took off this armor for a while during recovery.

Therefore, this external force, in the event of a heavy rain, tsunami, or storm, is in a state where the ability to defend against a disaster is very low, so it is feared that the damage will be aggravated. There is a risk, and there is a risk that these equipments will intensify the damage.]

[Jin-Gol Joo/Professor of Department of Civil Engineering, Dongshin University: We don't have a good sense of the initial speed, but if you think that it is about 140 km/h, you can't stand at a speed when you think that people are standing now in a car running over 100 km.

So, in our view, at a speed of 25 to 30m per second, the roof will be as strong as it flies, and if the intensity is 33 to 44m, that is, the Typhoon River, there is a risk that the train may derail.

And when it reaches 44m persec or more, it has the power of wind enough for people and large stones to fly away.

So, I would recommend that you refrain from going out a little while the typhoon is passing by.]

[Jin-Gol Joo/Professor of Civil Engineering, Dongshin University: Yes.

It's a very strong wind, so I'm concerned about damage, and in the case of winds, they don't blow continuously, but come and go momentarily.

That is why the maximum wind speed at the moment is more important. At this time, it is necessary to prepare in advance to reduce the damage.]

[Jin-Gol Joo/Professor, Dongshin University, Department of Civil Engineering: Since the maximum instantaneous wind speed is more responsible for causing damage than the average wind speed, you should always be prepared without peace of mind until the typhoon completely passes.]

[Jin-Gol Joo/Professor of Civil Engineering, Dongshin University: As I mentioned earlier, as the distance from the center of a typhoon increases, the wind damage may be a little less and the wind may become shallow.

However, even if it does not penetrate inland, rain damage continues to be a concern even in a typhoon that passes through the East Sea and the Korean Strait.

So, I think you still need to prepare for rain damage in the metropolitan area, Honam area, and Chungcheong area.]

[Jin-Gol Joo/Professor, Dongshin University Department of Civil Engineering: In fact, when it rains a lot and the wind blows, the view becomes narrower.

That's why driving is inevitably dangerous, and there is a concern about vehicle flooding, especially now on the road.

Flooded water When the flooded water level rises, the vehicle stops when water enters the vehicle intake or exhaust port.In general, it is better to refrain from driving when the water reaches half of the vehicle's wheels. ]