Why does it rain when the old well in Mengding Mountain opens the manhole cover?

Experts say that this phenomenon occurs because it is a special mountain shape. Mengding Mountain is located in the middle of the mountains, and the surrounding mountains are like lotus petals. The ancient well is located in the center. It's often cloudy and foggy here, with lots of clouds and disordered airflow. The central position of the ancient well has an influence on the whole mountain stream. But it has nothing to do with whether the manhole cover can be opened. It rains as soon as the manhole cover is opened, which is only an accidental phenomenon, mainly caused by the geometry of the mountain and so on.

Let me analyze the specific micro-mechanism and reasons.

The geometry of the mountain terrain here does have some influence, but it is only a condition and has nothing to do with the theme.

To simplify, the terrain here can basically be simplified as the structure and relationship between lotus petals and stamens. The location of the ancient well is the stamen, and the mountain is like a lotus petal. Looking at the overall situation, the ancient well of Mengding Mountain is in the ravine.

It rains when the manhole cover is opened. It must be windy.

No matter winter or summer, as long as there is no windy weather outside, the climate in the mountains is orderly and regular.

This means that in the whole ravine, mountain springs are mountain springs, hillsides are hillsides, dense forests are dense forests, weeds are weeds, stones are stones, and rivers are rivers. Under the sun, there is humidity and temperature everywhere. As long as there is no strong wind, these places with different humidity and temperature, where the airflow rises naturally, and where the airflow falls naturally, will stay out of the way and reach a balance with the outside world in an orderly manner.

So in this state, the rainy weather will rain, and the sunny weather will be sunny. This ancient well has nothing to do with this order. Of course, this was after the old well was built.

This terrain is symmetrical with the center, and the air pressure and airflow movement in the ravine form a central equilibrium point near the ancient well of Mengding Mountain. This balance point is only near the ancient well, or it can move up and down or left and right. It is not completely fixed according to the weather change, but it is basically around the ancient well.

This ingenious terrain, for thousands of years, people have discovered the function of this central balance point. After long-term observation and experiment, it was determined that this place has the function of influencing the weather change in mountainous areas, so a well was built. This phenomenon did not happen by accident, otherwise the ancient well would not have been built. The problem is that people can only blame the explanation of this phenomenon on the gods.

Vibration theory has not been discovered before, and the mystery has certainly tortured many generations! Now we stand up and become masters. Hey, hey, hey (from northern Shaanxi folk songs)!

As mentioned before, before the manhole cover was opened, all kinds of airflow and clouds in the ravine were carried out in an orderly manner, and the central balance point did not change, and the whole ravine maintained an overall balance.

The situation changed when the cover of the ancient well was uncovered.

Especially in summer, the ground temperature is around 30 degrees, and the temperature of underground well water is generally around 15 degrees. Scholars like to talk about systems. There are systems on the ground and underground. When the manhole cover is opened, the two systems begin to contact and the energy begins to exchange.

Children also know that there is a rule that energy flows from high to low, and high-temperature energy is transferred to the low-temperature end. Gas temperature increases, volume expands, gas temperature decreases, and volume contracts.

When the manhole cover is opened, hot air will inevitably flow into the well and exchange energy at the same time. The wellhead is small, the inside is big, and the water below is low temperature. So after the incoming hot air exchanges energy with the cold air in the well, the air in the well will rise in temperature and expand in volume, and will come out.

Therefore, in the process of energy exchange between the two systems inside and outside the well, the hot air around the wellhead is continuously cooled, the volume is reduced, and other outside air is attracted. While exchanging energy with the incoming air, the air in the well will increase in temperature and expand in volume, and will expand to the outside of the well. Therefore, in the cross section of the wellhead, the outer edge is air inlet and the center is air outlet, which forms such a mechanism within a certain time after the wellhead is opened. The rising air in the wellhead center and the supplementary air around the wellhead form a circulating flow. This local circulation has a famous butterfly effect. The reason is that this central balance point, if it is near the wellhead, can change the position of the central balance point through such circular flow.

The butterfly effect here can be understood in this way. A top, if you skillfully erect it, it can stand upright, but as long as you put a sesame seed on it, the upright top will fall down immediately. When a balance is in balance, as long as there is one sesame in another plate, the balance will also tilt.

Although the airflow disturbance caused by this ancient well is very small, it directly destroys the air pressure balance point in the whole mountain, and the airflow state in the whole mountain is out of balance, which immediately causes the airflow in the mountain to move around.

It turns out that the temperature above the mountain spring wetland on the back of the mountain is low and there is cold air. But the hot air from the top of the mountain is gradually replenished, and they have their own circulation loop. It turns out that on the stone pile on the hillside south of another mountain, the sun shines, the ambient air temperature is relatively high, the hot air rises, and the cold air next to it supplements, naturally forming a circulation loop. The self-regulation of the whole valley forms an orderly state, and a balance point is formed in the center of the valley to maintain balance.

Now that the balance point has been broken, the airflow in the whole ravine is moving wildly. There used to be a cloud air mass with relatively high temperature. When it meets the cold airflow, it immediately condenses into water and falls to the ground, which is the real reason for the rain due to the slight effect of this ancient well.

If this central balance point is not near this ancient well, the function of this ancient well will not be shown.

If there is a strong wind outside the ravine and there is also a strong wind inside the ravine, then the opening and closing of this ancient well cover will not have any influence on the ravine.