How did ancient people cope with sand and dust weather? What are the preventive measures?

1. The formation of tornadoes

Historical records of tornadoes are generally recorded as black dragons. I remember seeing the legend about the black dragon when I was watching "Tomb Raiders". Later, I checked some historical records and found out the specific reason for the so-called black dragon. Generally speaking, in ancient society, when a tornado swept through, people's vision and technological level were not up to standard at all, so they only saw crows devouring everything. There are records in ancient history that thousands of cattle and sheep were blown away directly by the tornado. People mistakenly thought it was a black dragon and swallowed the food.

So, the ancients believed that a tornado was a terrifying existence caused by a black dragon and a sanction from God to humans.

I have to say that the imagination of the ancients is still very scary, so how did the tornado come about?

According to existing geographical knowledge records, so-called tornadoes and sandstorms actually come from two reasons. One is that the north of our country is just at the mouth of the Siberian monsoon, so every time it gets cold, or the cold air moves south, there will inevitably be strong winds and waves in northern China. This is all wind power, but there is another power missing, that is, land structure.

According to historical records, the ancient north was not as barren as it is now, and there were many crops. However, due to excessive land reclamation and excessive warfare by the ancients, the Yellow River frequently changed its mouth into the sea.

And according to historical records, strong winds have changed the topography of the soil. The ravines are connected, forming a further strengthened narrow tube effect. The wind is getting stronger and stronger, so much so that it has the appearance of a black dragon. terrible phenomenon.

So, what kind of blow did people suffer in the face of such a terrible disaster?

2. The Tragedy of the Ancients

There are actually many records about the harm of tornadoes in history. However, the ancients believed that it was a punishment from God to human beings, so generally speaking, the recorded contents appear to be somewhat mythical. Whenever a tornado arrives, countless people and livestock are directly swallowed up, causing a large amount of loss of life and property.

In addition, these crazy tornadoes directly destroyed all crop production in the north, causing devastating damage to the agricultural structure in the north. And because the north happens to be in constant war, the more the agricultural structure is damaged, the more chaotic the north will be, the less developed its economy will be, and the more serious the disaster will be.

So every time a tornado came, the ancients thought it was a natural disaster, a devastating blow. Some people even set up temples to beg the Black Dragon King not to hurt them.

In addition to these horrific records, there is actually another interesting phenomenon remembered in the history of the Ming Dynasty.

It can be seen that the harm of tornadoes has even affected the rise and fall of a dynasty.

So, how should the ancients take defensive measures in the face of this terrible threat?

3. Defense methods of the ancients

According to historical records, in the face of this terrible pressure, the local people were unable to stop it, so they urgently needed the northern government to manage it. The earliest period of management was during the Northern and Southern Dynasties.

At that time, there were frequent wars in the north, and because the soil was becoming more and more loose, it was also hit hard by tornadoes. In order to curb this phenomenon and stabilize its own power, the government formulated the following three policies.

First of all, the first policy is for the army to set up sand prevention barriers.

We can’t imagine that during the war years, those northern soldiers set up the so-called most primitive grass-square sand barriers in the yellow sand. Many soldiers suffered devastating injuries, and many died in the process of controlling sand disasters. However, the north still established layer after layer of sand control systems, which later laid the foundation for the soil structure of the north. Provides a certain protective effect.

Secondly, the second policy is to implement local methods to retain water on a large scale.

There are not many records about ancient water flow methods, but we have more or less seen such descriptions in history books. The army and government directly adopted new methods among the people, and then set up various small wells. , allowing all groundwater to be conserved, and then preventing water sources from drying out in a more soothing way. Most of these methods came from folk methods, and the government adopted them in full and implemented them on a large scale at that time. It does play a better role in ensuring groundwater, so that the soil can be made more dynamic.

The third policy is interest guidance.

The government clearly stipulates that everyone must plant trees, and if everyone completes the goal of planting trees and survives, they will receive varying degrees of rewards. This system is somewhat similar to that of Emperor Wu of the Han Dynasty, which rewarded everyone for raising horses. As long as they raised horses, they could be exempted from taxes and corvee, and even obtain official positions. Therefore, under the guidance of policies, many people voluntarily went to areas with severe sandstorms to plant trees.