Bringing the Supermarket to the Apocalypse

Chapter 490

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The three moons in the sky have begun to gather, and the three of them will soon form a straight line. At that time, there will be a great tide in the Sea of Death in the end of the world, enough to flood the world of death.

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

Sea water has a cyclical rise and fall phenomenon: at a certain time, the sea water rises rapidly and reaches a climax; after some time, the rising sea water recedes on its own, leaving a beach and a low tide. This cycle repeats, never ending. 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 call both tide and tide "tide".

Tides are mainly determined by the gravitational pull of the moon and the sun. Although the moon is less massive than the sun, its tidal force is about 2.17 times higher than that of the sun. Whenever the moon moves in a straight line with the sun, the tidal forces of the two bodies will act in the same direction, and the rise and fall of the sea water will inevitably increase. This is the reason why people often say that "the tide rises on the first and fifteenth day of the lunar month". Astronomical spring tides are normal astronomical tidal phenomena with a cycle of 18.6 years and can be predicted several years in advance. Astronomical spring tides do not cause disasters under normal circumstances, but they can cause water damage under certain circumstances. For example, when a river is full during the flood season, it is supported by an astronomical spring tide, making it difficult for the flood to retreat; if an astronomical spring tide encounters a typhoon before and after it makes landfall, a storm surge will occur. ; If the river water level is low, the upward range of the sea tide expands, and the degree of salt damage increases, a salt tide will form.

The periodic changes in various elements of the atmosphere caused by the tidal force are called atmospheric tides, or air tides for short. Among them, 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 forces of the moon and the sun is 11:5. For the ocean, the lunar tide is more significant than the solar tide. The driving forces of earth tides, sea tides and air tides are all caused by the different gravitational forces of the sun and the moon on various parts of 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 an impact of the ground tide effect; and the migration of seawater mass caused by ocean tides changes the load on the earth's crust, causing the earth's crust to undergo sustainable changes. Complex changes. The air tide is above the ocean tide, and it acts on the sea surface to cause additional vibrations, making the changes in the ocean tide more complicated. As a complete tidal science, its research objects should be ground tides, ocean tides and air tides as a unified whole. However, because the phenomenon of ocean tides is very obvious and closely related to people's lives, economic activities, transportation, etc., it is customary to treat tides as The term is understood in a narrow sense as ocean tides.

Tides are mainly determined by the gravitational force of the moon and the sun, especially the tidal force of the moon. Although the moon is less massive than 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 cyclically, the effect of this force also changes cyclically. Whenever the moon moves in a straight line with the sun, the tidal forces of the two bodies will act in the same direction, and the rise and fall of the sea water will inevitably increase. As a result, this periodic tidal phenomenon appeared in front of people. This is the reason why people often say "big tides on the first and fifteenth day of the lunar month".

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

Astronomical spring tides do not cause disasters under normal circumstances, but they can cause water damage under certain circumstances. For example, when a river is full during the flood season, it is supported by an astronomical spring tide, making it difficult for the flood to retreat; if an astronomical spring tide encounters a typhoon before and after it makes landfall, a storm surge will occur. ; If the river water level is low, the upward range of the sea tide expands, and the degree of salt damage increases, a salt tide will form. If the astronomical spring tide encounters a typhoon before and after it makes landfall, a storm surge will occur. Storm surge refers to a marine disaster that occurs near the coast. It is a phenomenon in which strong weather systems such as strong winds or sudden changes in air pressure affect the sea surface, causing water levels to rise and fall sharply, often causing harm to coastal areas. Storm surge disasters rank first among marine disasters. Most of the world's major coastal disasters caused by strong storms are caused by storm surges.

The great tide of the Sea of Death in the last days has been known as a wonder in the world since ancient times. Whenever a spring tide comes, the huge waves are turbulent and majestic. The sound of the tide shakes the heaven and the earth. It is like thousands of troops and horses churning across the river. It has the potential to "turn over the river and overturn the sea and the mountains to destroy it". The tide head is generally 1 to 2 meters high, with the highest reaching more than 5 meters. It advances upstream at a speed of 5 to 7 meters per second, which is a spectacular sight.

But it’s really difficult to evaluate the disadvantages brought by this big tide. On the one hand, it can bring new energy to people in the end of the world. On the other hand, it floods the world of death, causing the disappearance and damage of many villagers and villages. 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 food for these mutant monsters.

In order to prevent the great tide from attacking the villagers, Death World built a large base as a defense line to protect the great tide. Now Lin Feng and Lin Xiaobao are in this base.

As night came, more and more people from this base appeared on the streets. They were in a hurry and seemed to be rushing in from outside the base.

From the nervousness of these people, we can know that the spring 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 dim night, this tense atmosphere makes Lin Feng was a little worried.

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

There was the sound of thousands of horses galloping outside the base, and there was a strong smell of water vapor and death in the air.

"The Sea of Death is overflowing, let's get into the house quickly."

Lin Feng smelled danger in the air and asked Dong Wu and Lin Xiaobao to go into the house to escape.

(End of chapter)