This phenomenon of bottom whirlpools in seawater has to start with a famous seawater sticking incident in 1893. Pen ~ fun ~ pavilion www.biquge.info

In fact, there has been a legend long ago that in the depths of the ocean there are cursed demons, who are cursing against the heavens, and they have nowhere to turn their grievances into storms and tsunamis that devour God's favored people. When the wind is calm, a curse is cast on the bottom of the sea, and as long as a ship passes through the cursed water, the ship will be trapped, and the fishing net will be knotted, making it difficult to move an inch. This is the "backwater" that fishermen talk about when the tiger changes color.

In 1893, the famous Norwegian explorer Nansen's "Frem" once encountered a strange thing on the sea that was "sticky" by the sea.

Nansen and his crew sailed the Fraim from the port of Oslo to the North Pole to confirm that there was a westward current in the Arctic Ocean that passed through the North Pole and then to the east coast of Greenland. However, when the ship reached the shores of the Termell Peninsula, the "Frem" suddenly could not move, as if it was "stuck" by the sea.

The crew panicked, thinking they had encountered a sea monster. But with years of experience in the expedition, Nansen calmly observed his surroundings: there was not a trace of wind and waves on the sea, the ship was far from the shore, it was impossible to run aground, and it was not on the rocks. Did you encounter the legendary "backwater"?

This discovery even made Nansen a little excited, and he began to carefully measure and record some relevant data, including the ship's course, speed, sea surface scene, nearby sea depth, density, and so on.

While Nansen was carefully sorting out the observations, a strong wind blew at sea, and the sails of the "Frem" bulged. And began to move slowly. The crew cheered and celebrated their escape.

Three years later. Nansen finally ended the expedition by figuring out not only the ice in the heart of the Arctic Ocean and beneath the cold waters of the polar regions. There is indeed a current from the Atlantic Ocean, and it also summarizes the law of ice floe. But when he returned to Norway, Nansen was still concerned about the mystery of the "backwater" he had experienced, so he set out to study this strange phenomenon with the oceanographer Ekman.

In the course of his research, Nansen found that when the ship was trapped, there was something strange about the nearby water: near the surface was a layer of fresh water that was not deep, and below it was salty seawater, which meant that the sea was layered. Of course. The situation of the "Frem" is different from the phenomenon of "flushing fresh water" near the coast, but because of the onset of summer, the ice floes at sea in cold regions melt, and the low-salt water layer floats on top of the high-salt and high-density seawater, thus forming a "density thermocline".

Once the vessel enters this area, and the draught of the vessel is exactly equal to the thickness of the upper water, the agitation of the propeller creates internal waves on the "density thermocline", which move in the opposite direction to the direction of the ship's travel. If the speed of the boat is relatively low, the huge internal wave resistance will force the ship to slow down. Or even stop. At this point, the crew will feel as if the ship is stuck in the sea or attracted by some mysterious force in the sea, and it will not be able to move an inch.

Today, seafaring technology is developing rapidly. The speed of the ship greatly exceeds the speed of the internal waves that can be generated, so the phenomenon of seawater "sticking" to the ship has become a thing of the past. It's almost impossible to happen again.

When David saw Kyle surprised by the whirlpool beneath the sea, David immediately encyclopedied the little story from the offline database.

You mean. The whirlpool here is also for this reason? Yi San knew David's intentions.

It's just a principle of vertical stratification of seawater, and it's also cited from the scriptures. James seemed to be born with a vendetta against David.

But the crowd did not dissuade them. After all, it's a bit interesting to tear up encyclopedic knowledge with an intelligent person.

"The uneven distribution of seawater density leads to uneven pressure distribution, and the movement of seawater caused by the pressure gradient force and the geostrophic deflection force reaches equilibrium is called density flow, also known as gradient flow. The density of seawater is related to temperature and salinity, and the difference in the level of temperature and salinity makes the density of seawater unevenly distributed, thus causing seawater to flow. According to the characteristics of temperature and salinity distribution in the ocean, in general, the effects of temperature and salinity almost cancel each other out in the mid-latitude sea area, while they reinforce each other in the low and high latitude sea areas. In addition, ocean currents can be divided into warm and cold currents according to the temperature of the ocean water. The warm current is warmer than the sea area flowing through it, and the cold current is cooler than the sea area flowing through it. Most of the warm and cold currents are ocean currents that flow in a north-south direction. David said lightly.

"Forget it, count you ruthless. In this way, it is also density stratification here, or temperature stratification! James said, pointing to the whirlpool a meter or two below the water.

"There's no reason why the gradient flow here is that the lower temperature of the sea is in the upper layer, and the hot water is in the lower layer." David muttered to himself.

"Confused, Dad, I'll tell you today, rote memorization is useless. It is located at the junction of the cold current of California and the cold current of Peru, and the cold current brings cold sea water into the cave, and the cave does not see sunlight all year round, resulting in even lower temperatures. However, this island of Kane is a volcanic island, and it is difficult to say that there are cracks in the seabed that provide geothermal heat to the deep seawater, and due to the gradient flow, the hot sea water and the cold sea water cannot mix, so this phenomenon occurs. The submarine whirlpool may be caused by cracks in the rock formations on the seabed! Also, you said that the temperature of the body just now was much higher than the water temperature, and I dare to pack the ticket, the water below is even hotter. The corpse was supposed to stay down there, because our involvement upset the balance of the whirlpool, which brought him up from the depths, so your infrared detector could detect that his body temperature was higher than the water. James said to David in the tone of an elder.

James' conjecture connected all these doubts. Kyle Yisan and they don't know it, and they feel that this is the truth.

"Wait, then why isn't the sea freezing at minus 14 degrees Celsius!? Also, why don't the corpses here rot!? These bodies were 200 years old. Kevin wondered.

"Two hundred years ago!"

Kyle thinks that the men may have been involved by accident in the shipwreck of a group that poached sea creatures. As for these antique equipment, some fanatical religious elements shout about returning to the ancient and inheriting, and it is not impossible to wear the water clothes that were submerged in previous centuries.

After Kyle's remarks, everyone felt that it was not unreasonable, or how to explain the reason why the corpse did not decompose.

Human beings instinctively weaken potential dangers, but the subconscious mind often magnifies this threat infinitely. The idioms of worrying about the sky and being prepared for danger in times of peace probably explain this phenomenon.

"No, no, am I mentally retarded, how is this possible!?" David's sensor measured a statistic that surprised him. (To be continued.) )