Chapter 544:

The three moons in the sky have begun to gather, and the three of them will soon be in a straight line. At that time, the sea of ​​death in the last days will have a big tide, enough to drown the tide of the world of death.
When the three moons are connected in a straight line, the moon's gravitational effect on the end of the world is large, which causes the end of the sea of ​​death to fluctuate, forming a tide that is enough to submerge the world of death.
There is a cyclical fluctuation in seawater: after a certain period of time, the seawater is swept up and swiftly rising, reaching; after some time, the rising seawater recedes by itself, leaving a beach and a low tide. This cycle repeats and never stops. This movement of sea water is the tide.
Tide
refers to the rise of seawater during the day, and
汐
refers to the rise of seawater at night, but usually we often refer to both tides and tides as
tidal
.
The tide is mainly determined by the tidal forces of the moon and the sun. Although the moon is smaller than the sun, its tidal force is about 2.17 times higher than 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 fluctuation of the seawater will inevitably increase. This is why people often say "the first and the fifteenth ups and downs." The astronomical tide is a normal astronomical tide, and its cycle is 18.6 years, which can be forecasted several years in advance. Under the general circumstances, the astronomical tide will not cause disasters. In some specific circumstances, it will constitute a water hazard. For example, when the rivers in the flood season meet the astronomical tide, the floods are difficult to retreat; if the astronomical tide encounters a storm surge before and after the typhoon landing, If the water level of the river is low, the range of the sea tide is extended, and the salt damage is aggravated, and a salty tide is formed.
The cyclical changes caused by the action of the tidal forces of the atmosphere are called atmospheric tides. The atmospheric tide caused by the sun is called the sun tide, and the moon is caused by the lunar tide. Because the moon is closer to the Earth than the Sun, the ratio of the Moon to the Sun is 11:5. For the ocean, the Taiyin is more pronounced than the Sun. The motive force of the earth tide, the tide and the gas tide are caused by the different gravity of the earth and the moon, and the three have mutual influence.
The elastic-plastic tidal deformation of the crust at the bottom of the ocean will cause the corresponding tides, that is, for the tides, there is the influence of the earth tide effect; and the migration of seawater mass caused by the tides changes the load on the crust and causes the crust to occur. The complex change. The gas tide is above the ocean tide, and it acts on the sea surface to cause its additional vibration, making the tide tide more complicated. As a complete tidal science, the research object should regard the tide, tide and gas tide as a unified whole, but because the tide is very obvious and closely related to people's life, economic activities, transportation, etc., it is customary to tide The term narrowly understood as the ocean tide.
The tides are mainly determined by the tidal forces of the moon and the sun, especially the tidal forces of the moon. Although the moon is smaller than the sun, its tidal force is about 2.17 times higher than the sun. As the relative positions of the Earth, the Moon, and the Sun periodically change, the effect of this force also changes periodically. 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 fluctuation of the seawater will inevitably increase. As a result, this cyclical tidal phenomenon has appeared in front of people, which is why people often say "the first, the fifteen ups and downs."
Although the sun is far away from the earth, its gravitational effect on seawater is relatively small. The seawater is mainly affected by the lunar gravity, 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 Ocean Monitoring and Forecasting Center, said that when the sun, the earth and the moon are in the same direction (the first and second days of the lunar calendar), the gravitational pull of the sun will help to make it higher; When the earth and the moon are at right angles, the gravity of the moon will be weakened, forming a "small tide."
Under the general circumstances, the astronomical tide will not cause disasters. In some specific circumstances, it will constitute a water hazard. For example, when the rivers in the flood season meet the astronomical tide, the floods are difficult to retreat; if the astronomical tide encounters a storm surge before and after the typhoon landing, If the water level of the river is low, the range of the sea tide is extended, and the salt damage is aggravated, and a salty tide is formed. If the astronomical tide encounters a storm surge before and after the typhoon landing, the storm surge refers to a marine disaster that occurs near the shore. It is a phenomenon in which the strong weather system such as strong wind or sudden change of air pressure causes the sea level to rise and fall sharply, which often causes damage to the coastal area. Storm surges rank first in marine disasters, and most of the world's most devastating coastal disasters caused by strong storms are caused by storm surges.
The tide of the sea of ​​death in the last days has been called the wonders of the world since ancient times. Whenever the tide comes, the waves are surging, the momentum is majestic, and the tides are shaking, such as the thousands of troops and the horses, the Hengjiang River is tumbling, and there is really a tendency to "break the river and destroy the sea." The tide is generally 1 to 2 meters high, up to 5 meters or more, and it is 5 to 7 meters per second, and it is going up the river. It is like a bamboo. It is spectacular.
However, the downside caused by this tide is really difficult to evaluate. On the one hand, he can bring new energy to the people of the last days. On the other hand, he has drowned 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 the innocent villagers will become the food of these mutant monsters.
In order to prevent the tide from attacking the villagers, the death world established a large base as a defense line for the protection of the tide. Now Lin Feng and Lin Xiaobao are in this base.
With the arrival of the night, more and more people in this base appeared on the streets. They were in a hurry and seemed to be rushing from outside the base.
From the degree of tension of these people, we can know that the tide is about to come, the moonlight in the sky has become dim, it seems that because the three moons are in a straight line, the moonlight has also decreased a lot. In the dark night, this tense atmosphere makes Lin Feng is a little worried.
Business casting 咣 咣! After a loud noise, the people in the base looked nervously at the gate of the base. Lin Feng and several of them also came out to see the situation. The gate of the base was closed, and the end of the world began.
There is a sound of thousands of horses running outside the base, and there is a strong smell of water and death in the air.
"The sea of ​​death is flooding, let's go into the house."
Lin Feng smelled the danger in the air discovered Dong Wu and Lin Xiaobao disposed in the house.
...