Will the 12 meter wave caused by the typhoon cause a major natural disaster?

This typhoon is the 10th typhoon of 2020, and it is a super storm named "Poseidon". The impact includes Japan, South Korea, North Korea, China and parts of Russia. According to the latest reports, Typhoon "Haishen" is moving in a northerly direction, passing through the eastern part of South Korea and North Korea, and reaching the territory of Jilin Province and Heilongjiang Province of China.

Fortunately, the wind intensity of Poseidon gradually weakens as it moves, downgrading from a strong typhoon to a typhoon, and finally gradually degenerating into an extratropical cyclone. <>

Affected by the typhoon, the eastern part of our country, especially the northeastern region, will appearHeavy precipitation, thunder, strong winds and other strong convective weatherhail may occur in some areas and surrounding seas. Also, it can happen in coastal citiesStorm surge。These are all direct disasters caused by typhoons.

In addition, the secondary disasters caused by typhoons should not be underestimated. For example, frequent heavy precipitation may causeGeological disasters such as mountain floods, landslides and debris flows have a high probability of flooding in some areas.

According to the statistics of the China Meteorological Administration, in the first three quarters, a total of 4 typhoons landed in mainland China, 2 less than the same period in many years (6), but in terms of intensity, the No. 9 super typhoon "Lekima" is the fifth strongest super typhoon that landed in mainland China since 1949, compared with the average of the same period in the past five years, the direct economic losses caused by typhoon disasters are 10% more, and the number of deaths and missing persons due to disasters has decreased by 25%.

Not only that, but the passage of typhoons can also bring ecological damage and disease. For example, in a coastal city that suffers from a storm surge, in addition to the economic and human losses such as washed away buildings and farmland and missing people, the salinization of land caused by coastal erosion and seawater inflow is a problem that has to be faced in the future. The erosion of the ground by heavy rainfall, coupled with geological disasters such as mudslides, and the destruction of surface vegetation are almost devastating.

In particular, the underground drainage pipeline system in most cities in China is not perfect, and urban waterlogging is easy to occur. In addition, it is easy to develop epidemics after floods. These are the problems that have to be solved after the typhoon.

Yes. Typhoons themselves can bring disasters, ranging from flooding of roads and destruction of agriculture to collapsed houses and flooding.

I believe that this typhoon will definitely cause a major natural disaster, and the typhoon will make landfall in the inland areas of our country for some time to come, so we must strengthen our precautions.

Yes. Wild waves can destroy all kinds of buildings along the sea, destroy roads, and if people get too close and are hit by the waves, it can cause fatal injuries.

At present, the wave warning level in the coastal waters of Shanghai and Zhejiang is yellow, and the wave warning level in the coastal waters is 2 3 meters for medium and large waves, which will cause certain natural impacts on these cities.

a Tsunamib **.

c Mudslides, landslides d Volcanic eruptions.

My analysis: Heavy rains brought by typhoons can cause flooding; Landslides, mudslides and other natural disasters.

Geological disasters such as seawater inflow, floods, mudslides, landslides, etc.

Squall line in front of the stage (severe thunderstorms, hail, tornadoes).

The closest distance between the typhoon center and city A is 240 sin30° = 120 km.

In this 120 km distance, the typhoon has attenuated 120 km from 12 to 25 km = magnitude. Therefore, city A was most affected by the typhoon.

The center of the typhoon began to affect city A at a distance of 8*25=200 km from the city of A. In the illustration, the EF segment is the section of the typhoon center moving on City A.

Now let's find the EF distance.

In the triangle AEF AD is perpendicular to EF, AD = 120 km, AE = 200 km.

ed=df=root(200 2-120 2)=160m.

So ef = ed + df = 160 + 160 = 320 meters.

The 320-meter path typhoon speed is 20 km/h, elapsed time = 320 km 20 km h = 16 hours.

Summary: City A was affected by the typhoon.

The typhoon affected City A for 16 hours.

The maximum wind level affected by a typhoon in a city.

The answer is hours. As shown in the figure above, we know that the conditions are:

1.The distance between A and B is 300km.

2.The speed from B to C is 20km h.

3.With b as the origin, the angle between b and c is 60°.

To know whether it will have an impact on city A, only the distance between A and C (between two points, the shortest line segment) is required

So we can push it like this: (Picture posted).

Therefore, sin30°=ac ab ac=150km 170km, so city A will be affected. And because a, b, and c form a right triangle, according to the Pythagorean theorem, the distance between b and c is 250 km, so the duration is .

I hope it helps you, and besides, I typed so many words and drew a picture for you by hand, so I should adopt it, right? Huh

2011 High School Entrance Examination Mathematics Round 1 Review: Right Triangle, Pythagorean Theorem, Area.

1. Affected, let the nearest point of the typhoon center from city A when passing through n is C, according to the title, ABC is a right triangle, angle C is a right angle, and angle B is 30 degrees, because AB is 300 kilometers, then AC is 300 2 = 150 kilometers, which is the range of typhoon influence (within 170 kilometers).

20 = 8 hours.

Anyone who knows math can do it!

1) Was City A affected by the typhoon? Why?

2) If city A is affected by a typhoon, how long will it last?

1) A: The city will be affected by this typhoon. Because the two points of AB are 20 kilometers apart, the wind force in the center of point B is 12, and every 20 kilometers away from the center, the wind weakens by one level, so it is concluded that the wind force in city A is 12-1 * (20 20) = 11.

That is, the city is affected by winds of more than Category 4 and the city is being affected by a typhoon.

2) Set a typhoon to affect the city for x hours. By the conditions:

15x=2*20*cos30°

Solution: x=4 3 3 (four-thirds of the root number three) if you have not learned, you can change to a decimal number: x hours) that is, 2 hours, 18 minutes, 33 seconds.

A: The typhoon affected the city for about 2 hours, 18 minutes and 33 seconds.

3) The maximum wind force affected by the typhoon in the city is X. By the conditions:

12-x）*20=20*sin30°

Solution: x = A: The maximum wind force affected by the typhoon in the city is magnitude.

1. According to the title, we know that the city will not be affected when it reaches level 4, and the wind at the center of the typhoon will not change, we calculate the shortest distance from A to BC, as shown in the figure, that is, AD=AB sin30=240 1 2=120 km, if it is not affected by the typhoon, then the city should be more than 25 (12-4)=200 km from the typhoon center, because 200>120 is affected by the typhoon.

The Pythagorean theorem, DE = 160 km, so EF = 2DE = 320 km, duration = 320 20 = 16 hours.

3. The maximum wind force is that the typhoon moves to d, so the maximum wind force is 120 25 = level.

t=1316859217359

ab 220 km b 30° ad 110 km.

According to the inscription, when point A is not more than 160 km away from the center of the typhoon, it will be affected by the typhoon, so the city will be affected by this typhoon.

2) According to the inscription, when point A is not more than 160 km from the center of the typhoon, it will be affected by the typhoon, then AE AF 160 km, when the center of the typhoon moves from E to F, the city will be affected by this typhoon, and the Pythagorean theorem is obtained by de 30 times the root number 15

EF 60 times root number 15(km).

The center of the typhoon moved four times at a speed of 15 km/h, and the number 15 was 15

The duration of this typhoon affecting the city is:

3) When the center of the typhoon is located at D, City A has the greatest wind strength of this typhoon, and its maximum wind force is .

It's clearly a topic of analytic geometry, so let's put it in high school math. Don't put it in the earth science class, atmospheric science majors now use software, and no one uses their hands to calculate this thing.

Hehe, math problems in the cloak of geography.

1. According to the title, we know that the city will not be affected when it reaches level 4, and the wind at the center of the typhoon will not change, we calculate the shortest distance from A to BC, as shown in the figure, that is, AD=AB sin30=240 1 2=120 km, if it is not affected by the typhoon, then the city should be more than 25 (12-4)=200 km from the typhoon center, because 200>120 is affected by the typhoon.

The Pythagorean theorem, DE = 160 km, so EF = 2DE = 320 km, duration = 320 20 = 16 hours.

3. The maximum wind force is that the typhoon moves to d, so the maximum wind force is 120 25 = level.

?t=1316859217359

Solution: From (12-4)*20=160, it can be seen that the wind force of the city within 160 kilometers of the typhoon center reaches or exceeds level 4.

If the center of the typhoon is y kilometers away from the city after t hours, it can be seen from the triangular cosine theorem: y 2 = 220 + (15 t) 2-2 * 220 * 15 t * cos30 degrees.

Solution inequality y<=160

Get the range of t. It is the point in time when it is affected by a typhoon.

3) When y is the smallest, the wind is at its strongest. The right triangle can be used with an angle of 30 degrees, the minimum y is 110 km, and the maximum wind force is 12-110 20=.

The typhoon is 120 km away from place A, that is, the maximum wind force of place A is 12-(120 20) = level 6, and it will be affected.

The length of the affected is 90*2=180km, and the time = 180 15=12 hours.

I'm sorry, it's so professional, I guess I can't trust it.

(1) It will be affected by typhoons.

Reason: When the typhoon moves northeastward, when it is closest to A, 220 sin30°=110,110 20=;;

More than level 4, affected by typhoon.

2) When the typhoon is moving northeastward, its distance from a is 20 (12-4)=160km, it begins to be affected or ends its impact.

Time taken 2 (160 2-110 2) (1 2) 15=4 15 hours.

3) The maximum wind magnitude of the city affected by the typhoon.

To correct your small mistake, there is no wind in the center of the typhoon, the center of the typhoon is the eye of the typhoon, and the wind is the greatest only in the area near the center.