What is Jiang Jingfang's statement of geomantic omen?

What is Jiang Jingfang's statement of geomantic omen? -From the point of view of hydromechanics, because of the river flow, it can drive the air to flow and circulate, that is to say, it can drive the harmful gas circulation produced by human activities to other parts, thus renewing the fresh air suitable for human beings and benefiting human physical and mental health. In general, gases harmful to human body, such as dust and carbon dioxide, are relatively more important than oxygen beneficial to human body. From the enlightenment of agricultural steaming, it can be concluded that the law of gas-liquid circulation has the characteristics of "heavy and frivolous" That is, the relatively harmful and heavy gas stays on the surface near the ground, that is, the human activity floor just in the bungalow. The characteristic of air propulsion is "wind". In the absence of wind and relative stillness, harmful gases only stay at the level of human activities, which will inevitably have hidden and direct harmful effects on human health. The flow of the river just plays a fundamental role, taking away the harmful gas at the bottom, like an aerator, and increasing the fresh air beneficial to human health. The river is the aerator of the earth's activities. The fact is that in the long historical process of human activities, the population near the river is obviously growing rapidly and intensively. In addition to the convenience and benefit of water conservancy, the role of invisible air circulation and circulation phenomenon and the role of aeration device can not be ignored or underestimated. Realistic rural areas can also prove that under the condition of secret congestion in rural areas in river areas, the birth rate is not necessarily low, but the probability of population survival is low, and the elimination rate of natural pottery is high. The cumulative population base in several years is relatively lower than that in river areas. The power of air circulation should not be underestimated.