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"The ocean is the mother of mankind, the cradle of mankind, and the homeland of mankind. ”
This is a sentence once said by Li Siguang, a famous marine geologist on the mainland.
Li Siguang is not only a well-known marine scientist on the mainland, but also the first person to conduct polar scientific research on the mainland, and has made significant contributions to the mainland's marine scientific research.
Li Siguang has a deep affection for the ocean, he believes that the ocean is mysterious, changeable, and vast, it is the foundation of human existence, the place where life originated, full of vitality and miracles, and makes people awe-inspired.
However, the ocean is also full of unknowns and dangers.
The dangers in the ocean include not only destructive marine disasters, but also many "strange dangers" that are difficult to prevent.
In the sea, there are many scary "ghost tricks" that even experienced fishermen are terrified.
How terrible are these "strange dangers"?
And what is it?
1. The dangers of the oceans.
The ocean is the largest ecosystem on Earth, accounting for 71% of the Earth's surface area, and the ocean accounts for 96.53% of the Earth's water volume.
The ocean is the place where life originated, a treasure trove of energy for the richest resources and largest reserves on Earth.
The ocean is rich in resources, human beings have obtained countless wealth from the ocean, the energy of the ocean is also the driving force of human development, the energy of the ocean mainly includes tidal energy, wave energy, current energy and temperature difference energy, etc., these energy sources are renewable, is clean, and can meet the long-term energy needs of human beings.
However, the ocean is also a place full of unknowns and dangers.
The ocean is vast and vast, and human understanding of it is limited.
Today, only 5% of the world's oceans are explored, and 95% of the oceans remain unknown.
The ocean is deep and mysterious, and it hides many unknown secrets, however, these unknown secrets also hide dangers and threats.
The dangers in the ocean include not only many destructive marine disasters, but also many "strange dangers" that are impossible to prevent.
There are three main dangers in the ocean: one is marine disasters, the second is the dangerous creatures in the ocean, and the third is the climate and meteorological changes in the ocean.
Marine disasters are triggered by the forces of nature, and their destructive power is often enormous, and many marine disasters are a nightmare for humanity.
The most common marine disasters are tropical cyclones, storm surges and tsunamis.
Tropical cyclone, also known as typhoon, hurricane, sunflower, wind flower, limelight, wind rose, etc., this is a natural phenomenon with huge destructive power, it is a weather phenomenon of strong wind produced by large-scale rotation of air, the diameter of tropical cyclone is generally 100~200 kilometers, its center is called "typhoon eye", the diameter of typhoon eye is generally 10~100 kilometers.
The eye of the typhoon is very calm, the wind speed is very small, generally below level 5, or even windless, therefore, people will mistakenly think that the wind and waves are calm, but they do not know that this is the center of the eye of the typhoon, the center of the storm, so if you encounter the eye of the typhoon, you must be careful and do not venture out to sea.
In addition to typhoons, there are storm surges, etc.
Storm surge refers to the wave phenomenon caused by strong winds on the sea surface, storm surge can produce very large waves, its height can even reach about 10 meters, the harm of storm surge is mainly to produce strong waves, the impact on ships is very large, it is possible to overturn ships.
Tsunami is caused by geological processes such as earthquakes, volcanic eruptions and landslides on the seabed, its hazard is to produce huge, destructive waves, the height of the tsunami can reach tens of meters, its speed is very fast, generally around 500 km / h, its hazard is to produce huge destructive waves, the safety of coastal buildings and personnel have great harm.
Humans are very vulnerable in a tsunami.
The magnitude 9.5 earthquake that struck Chile in 1960 triggered a Pacific tsunami, the worst tsunami ever recorded, with a height of 25 meters and a tsunami wave force of 3,000 tons per square meter.
2. "Strange and dangerous phenomena" in the ocean.
However, the dangers in the ocean are not limited to these natural disasters, there are many "strange dangers" that cannot be prevented.
Among them, the most frightening are the offshore currents at the bottom of the sea and the mysterious "mad dog waves".
There are thousands of "ghost tricks" in the ocean, but the "mad dog wave" is undoubtedly the most dangerous.
Offshore current is a fluid phenomenon that often occurs in the ocean, it is a fluid phenomenon in the ocean, the speed of the offshore current is very fast, generally 5~10 meters per second, some even reach 30 meters per second, the depth is generally 30~50 meters, and some even reach 100 meters.
The offshore current is very dangerous, it can directly wash the ship hundreds of kilometers away, it can directly take divers to a depth of hundreds of meters or even thousands of meters, divers are often washed to a very deep place, there is no way to come up, and eventually die due to lack of oxygen, lack of water, etc.
Submarine currents pose a deadly threat to humanity.
So, in the face of the offshore currents at the bottom of the sea, how should humans save themselves?
The first is to avoid going to places where there are offshore currents, and humans should try to stay away from places where they are going to rip currents, so as to reduce the danger of being exposed to offshore currents.
Second, if you accidentally enter the place where the offshore current occurs, human beings should swim upstream as soon as possible, preferably horizontally, and do not fight against the downward flow of the offshore current, because this will waste physical strength, and often die in the end due to physical exhaustion.
If you are a diver, the best way to save yourself is to release the wetsuit and breathing apparatus as soon as possible, which can reduce the risk of being exposed to the rip current, and if you are injured, stop the bleeding as soon as possible to avoid death due to excessive blood loss.
In addition to rip currents, there is a mysterious danger called the "mad dog wave".
"Mad Dog Wave" is a huge wave, its height can even reach 10 meters, its power is very large, enough to capsize a boat, and even swallow a small boat, it can appear instantly, disappear in an instant, come and go without a trace, human understanding of it is very limited.
"Mad Dog Wave" generally appears at night or in the morning, when the wind is calm, a huge wave suddenly appears, the height of the huge wave can even reach about 10 meters, it has neither omen, nor precursor, just like a "mad dog" that appears, so people call it "Mad Dog Wave".
The Mad Dog Wave is so dangerous that it can easily swallow a small boat, so fishermen are very afraid of it, even experienced fishermen, let alone novice fishermen.
The cause of the "mad dog wave" is not very clear at present, and many scientists have studied it, but still no conclusion has been reached.
III. Conclusion
The ocean is the foundation of human existence, it is the place where life originated, it is the cradle of life, and it is the hometown of human beings.
However, the ocean is also full of unknowns and dangers, and human beings should be more humble and reverent of the power of nature.
Mankind should devote itself to marine scientific research, discover the secrets of the ocean, discover the dangers of the ocean, study how to prevent these dangers, and protect the safety of human life and property.
The power of nature is endless, and human beings need to face the unknowns of the ocean with caution and courage to improve their ability to cope with dangerous situations.
Only in this way can human beings make better use of marine resources and promote the development of human society.
It is important to understand the knowledge of marine disasters and hazards to help people improve their awareness of self-protection and reduce the occurrence of disaster events.
For some mysterious phenomena, such as the "mad dog wave", scientists need to continue to study in depth to uncover their true causes and prevention methods.