Take the supermarket to the apocalypse

Chapter 447
The three moons in the sky have already begun to gather, and the three of them will soon form a straight line. At that time, there will be a tide in the sea of ​​death in the last days, which is enough to drown the world of death.

When the three moons are connected in a straight line, the gravitational effect of the moon on the last days will be greater, which will cause the sea of ​​death in the last days to fluctuate, forming a tide that is enough to submerge the world of death.

Seawater has a periodic fluctuation phenomenon: after a certain period of time, the seawater pushes the waves, rises rapidly, and reaches a high tide; after a while, the rising seawater recedes by itself, leaving a beach and low tide.This cycle repeats, never stops.This movement of sea water is the tide. "Tide" refers to the rise of sea water during the day, and "tide" refers to the rise of sea water at night, but we usually refer to both tide and tide as "tide".

Tides are primarily determined by the gravitational pull of the moon and sun.Although the mass of the moon is smaller than that of the sun, its tidal force is about 2.17 times higher than that of the sun.Whenever the moon moves to be in a straight line with the sun, the tidal force of the two bodies will act in the same direction, and the fluctuation of sea water will inevitably increase.This is the reason why people often say "the first and fifteenth day of the new year rises".The astronomical spring tide is a normal astronomical tidal phenomenon. Its cycle is 18.6 years, and it can be predicted several years in advance.Under normal circumstances, astronomical high tides will not cause disasters, but in some specific environments, they will cause water damage. For example, when the river is full during the flood season, it will be difficult for the flood to recede when the river is full; ; If the water level of the river is low, the upward range of the sea tide expands, and the degree of salt damage increases, forming a salt tide.

The periodic changes of various elements of the atmosphere caused by the gravitational tidal force are called atmospheric tides, or air tides for short.The atmospheric tides caused by the sun are called solar tides, and those caused by the moon are called lunar tides.Because the moon is closer to the earth than the sun, the ratio of the tidal force of the moon to the sun is 11:5. For the ocean, the lunar tide is more significant than the solar tide.The driving forces of ground tide, sea tide and air tide are all caused by the different gravitational forces of the sun and the moon on the earth, and the three influence each other.

The elastic-plastic tidal deformation of the crust at the bottom of the ocean will cause corresponding ocean tides, that is, for ocean tides, there is a ground tide effect; and the migration of seawater quality caused by ocean tides changes the load on the crust, causing the crust to take place. complex variation.The air tide is above the sea tide, and it acts on the sea surface to cause its additional vibration, making the change of the sea tide more complicated.As a complete tidal science, the research object should take the ground tide, sea tide and air tide as a unified whole. However, because the tide phenomenon is very obvious and closely related to people's life, economic activities, transportation, etc., it is customary to treat the tide as a whole. The term is narrowly understood as ocean tides.

Tides are mainly determined by the gravitational pull of the moon and the sun, especially the gravitational pull of the moon.Although the mass of the moon is smaller than that of the sun, its tidal force is about 2.17 times higher than that of the sun.As the relative positions of the Earth, Moon, and Sun change periodically, so does the effect of this force.Whenever the moon moves to be in a straight line with the sun, the tidal force of the two bodies will act in the same direction, and the fluctuation of sea water will inevitably increase.As a result, this periodic tide phenomenon appeared in front of people, which is why people often say "the tide rises on the first and fifteenth day of the new year".

Although the sun is far away from the earth, the gravitational effect on the seawater is relatively small, and the seawater is mainly affected by the gravitational force of the moon, but the gravitational force of the sun can still strengthen or weaken the gravitational effect of the moon on the earth.Wang Hongxin, director of the Provincial Marine Monitoring and Forecasting Center, said that when the sun, the earth and the moon are in the same direction (around the first and fifteenth day of each month in the lunar calendar), the gravitational force of the sun will play a role in fueling the flames, making the high tide higher; When the sun, the earth and the moon are at right angles, the gravitational force of the moon will be weakened, forming a "neap tide".

Under normal circumstances, astronomical high tides will not cause disasters, but in some specific environments, they will cause water damage. For example, when the river is full during the flood season, it will be difficult for the flood to recede when the river is full; ; If the water level of the river is low, the upward range of the sea tide expands, and the degree of salt damage increases, forming a salt tide.If the astronomical high tide encounters a typhoon before and after landing, a storm surge will erupt, and the storm surge refers to a kind of marine disaster that occurs near the coast.It is a phenomenon in which the water level rises and falls sharply due to the action of strong weather systems such as strong winds or sudden changes in air pressure on the sea surface, and often causes harm to the coastal areas.Storm surge disasters rank first in marine disasters, and most of the major coastal disasters caused by strong storms in the world are caused by storm surges.

The tide of the sea of ​​death in the last days has been called a wonder of the world since ancient times.Whenever the spring tide comes, the huge waves are surging, majestic, and the sound of the tide is shaking the sky and the earth, like thousands of troops, and the river is churning.The tide head is generally 1 to 2 meters high, and the highest is more than 5 meters. It advances upstream at a speed of 5 to 7 meters per second, and it is magnificent.

But the harm brought by this kind of tide is really hard to evaluate. On the one hand, it can bring new energy to people in the last days. On the other hand, it drowns the world of death, causing many villagers and villages to disappear and be damaged. Since the end of the world, there have been many monsters in the sea of ​​death. These mutant monsters will come to the world of death with the tide, and innocent villagers will become the food of these mutant monsters.

In order to prevent the tide from attacking the villagers, the dead world established a large base as a line of defense to protect the tide. Now Lin Feng and Lin Xiaobao are in this base.

As night approached, more and more people from this base appeared on the street. They were in a hurry, and they seemed to have hurried over from outside the base.

From the tension of these people, one can know that the tide is coming, and the moonlight in the sky becomes dim. It seems that because the three moons are connected in a straight line, the moonlight is also reduced a lot. In the dark night, this tense atmosphere makes people Lin Feng was a little worried.

When 'Boom! After a loud noise, the people in the base looked nervously at the gate of the base. Lin Feng and the others also came out to check the situation. The gate of the base had been closed, and the tide of the apocalypse had begun.

The sound of galloping horses came from outside the base, and there was still a strong smell of water vapor and death in the air.

"The sea of ​​death is flooding, let's get inside the house."

Lin Feng smelled danger in the air, and let Dong Wu and Lin Xiaobao enter the house to escape.

(End of this chapter)