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Construction and function of the Kizugawa arch in Japan
In order to protect the Tokyo Bay area and Osaka City from tsunamis, Japan reportedly built an arch at the mouth of the Kizugawa River at a cost of 3 billion yen. The arch is made of steel, is 66.7 meters wide, 11.9 meters high and weighs 530 tons. The arch is divided into two parts, piers and arches, connected by hinges in the middle, and the two sides can be automatically rotated. When the tsunami hits, the staff activates the arch switch in the operating room. It connects to each other and lies flat within 30 minutes, forming an arched structure that blocks the intrusion of seawater and diverts it to the sides.
However, the arch can only withstand some small tsunamis, and it is powerless in the face of powerful tsunamis that exceed the height of the arch. However, in September 2018, a typhoon that triggered a tsunami was successfully intercepted by the arch, protecting the downstream area. This suggests that in some cases, the arch still has high resistance.
Other precautions and preparations in Japan
In addition to the Kizugawa Arch, Japan has taken several other measures to defend against tsunamis and earthquakes. They built a huge tidal barrier in Numazu City, which cost 4.3 billion yen and took nine years to complete. The reinforced concrete dike is 45 meters high and weighs 923 tons, and has the ability to withstand earthquakes of magnitude 8. Three minutes after the earthquake, the tidal wall closes in time to withstand tsunami attacks.
In addition, Japan has taken other physical protection measures, such as the construction of many high walls in coastal areas, as well as elevators, sluices and other facilities. The gates are equipped with an automatic control system and connected to a seismometer. Once a strong earthquake is detected or the water level exceeds the warning line, the system will automatically sound an alarm and sound the alarm in time. These facilities were established to provide effective protection in the event of a tsunami and to increase the chances of survival of residents.
In addition, Japan's coastal cities have set up natural disaster evacuation points early on and regularly conduct disaster drills. The government also actively publicizes and disseminates disaster prevention knowledge in ordinary times to raise public awareness of disaster prevention.
Personal summary and reflection
As an island nation located in the Pacific Rim seismic zone, Japan has been facing the threat of natural disasters such as earthquakes, tsunamis, and typhoons. In order to protect themselves from disasters, they not only invested a lot of effort in technology, building arches, breakwaters and other buildings, but also put a lot of effort into disaster prevention and evacuation.
From Japan's experience in disaster prevention, we can see some measures that a country should take in the face of natural disasters. First, it is necessary to strengthen the scientific research and prediction capabilities of natural disasters, timely warn and take corresponding countermeasures. Second, it is necessary to strengthen public disaster prevention education and enhance the public's awareness and ability to prevent disasters. In addition, attention should be paid to the use of building materials adapted to natural disasters and reasonable design during construction to enhance resilience. Finally, it is necessary to strengthen the management and supervision of natural disasters to ensure the safety and effectiveness of buildings and facilities.
As a country located in a region prone to natural disasters, China also needs to learn from Japan's experience and enhance its ability to prevent and respond to natural disasters in light of its own reality. Only by doing a good job in disaster prevention can we better protect the safety of people's lives and property and reduce the losses caused by natural disasters to social and economic development.
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