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What happened to the powerful ocean typhoon?

People sometimes find a strong mushroom-shaped cyclone on the tropical ocean. Its diameter is usually more than a few hundred kilometers and the cloud height is more than 9 kilometers. This is a typhoon. The swells, heavy rains and storm surges it brings cause great damage to maritime vessels and coastal facilities.

Typhoons can be divided into typhoon eye area, typhoon vortex area and typhoon peripheral area. The typhoon eye area is the central part of the typhoon. It is a relatively calm, hollow tubular area with little or no clouds. It has a diameter of 10 to 60 kilometers. The air pressure is extremely low, stable and rarely changes, and is surrounded by high altitudes. Surrounded by a wall of clouds. The sea conditions here are very bad, and pyramid waves, which are extremely harmful to ships, often appear here. The typhoon vortex area is the annular area with the maximum wind speed around the eye of the typhoon. The tall and thick cloud wall here is tens of kilometers wide, and its radius is about 100 kilometers. In this area, strong winds of 40 m/s to 60 m/s It is a common thing. There have been strong winds of more than 100 meters/second. The outer area of ​​the typhoon is the windy area on the edge of the typhoon. The weather in this area is chaotic and rolling, the rainfall is sometimes heavy and sometimes light, and sometimes falls and stops. The wind gradually increases toward the center of the typhoon, and the air pressure decreases.

On September 26, 1935, the 4th Fleet of the Japanese Navy suddenly encountered a typhoon while traveling across the sea in Sanriku. However, they continued to move forward as planned despite strong winds and waves. At that time, the maximum wind speed at the center of the typhoon reached 40 meters. / second, the maximum wave height is more than 14 meters. The fleet crossed the typhoon and entered the eye of the typhoon. As a result, 38 warships were attacked by strong winds and huge waves. The destroyers "Hatsuyuki" and "Yugiri" were cut off in the middle, the bridge of "Mozuki" was broken, and all the mine ships that entered the dangerous semicircle were wiped out. 14 ships were over 5,000 tons. The large ships were also damaged to varying degrees, with a large number of casualties and extremely heavy losses.

The central and Kanto regions of Japan were hit by a typhoon on September 26, 1958. The heavy rain brought by the typhoon caused the Izu Kano River embankment to burst, turning the northern plain of Izu into a vast ocean, and 5,000 people died immediately. Floods surged along the coastlines of Nagoya City, Yokkaichi and other places, and 5,000 people were swept away again. This typhoon from Izu Bay made people not only aware of the horror of typhoons, but also tasted the taste of tsunamis.

There was also a typhoon on September 26, 1954. After that typhoon passed across the Japanese mainland, it turned back and hit Hokkaido. The huge wind and waves knocked the 8,000-ton Seikan intermodal transport ship " The Toya Maru was overturned, and more than 1,300 people were buried at the bottom of the sea. "Toya Maru" is not an ordinary ship, but a high-quality ship that the entire crew is proud of, and the ship's control facilities are also very advanced. At that time, there were not only the "Toya Maru" in the sea of ​​Hakodate, but also many Seikan cargo intermodal transport ships. These ships also overturned and sank in an instant.

The typhoon that occurred in Bangladesh in November 1970 was the most serious typhoon disaster in modern times. This typhoon developed strongly in the Bay of Bengal, with a central pressure as low as 940 hPa and a maximum wind speed of 120 knots (62 m/s). It made landfall at Hatiya near Chittagong from the night of November 12 to the early morning of November 13, and violently attacked the coast of Bangladesh. Strong winds, heavy rains, and sea tides swallowed up countless islands, fishing villages, and farms. Since those two days happened to be the 14th and 15th of October in the lunar calendar, there were astronomical tides and storm surges. The highest tide level was more than 6 meters. The huge waves swept away many people who were still sleeping soundly. In a short period of time, more than 300,000 people lost their lives and tens of millions were displaced. The entire densely populated Ganges Delta instantly turned into a horrific hell on earth. The economic losses it has suffered are huge and immeasurable.