The community is surrounded by mountains on three sides and the river on the west. Is it good for the community?

What is Jiang Jingfang's statement of geomantic omen? From the point of view of hydrodynamics, because of the flow of river water, 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 more important than oxygen beneficial to human body. From the enlightenment of rural soil steaming, we can draw a conclusion that the law of gas-liquid circulation has the characteristics of "heavy and frivolous" That is, the relatively harmful and heavy gas stays in the surface layer close to the ground, that is, the ground layer where human activities are 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 river is in the lowest geographical position, and the harmful gases are first enriched to the lower part of the river under the action of air hydrodynamics. The flow of river water only plays a basic role in taking away the harmful gas at the bottom, like air filters and aerators, supplementing fresh air beneficial to human health. Rivers are air filters and ventilators for earth activities. The fact is that in the long historical process of human activities, in places with obvious population growth and high density near large rivers, besides the convenience and advantages of water conservancy, the role of invisible air circulation phenomenon and the role of air filters and aerators can never be ignored or underestimated. The realistic rural areas can also prove that the birth rate is not necessarily low, but the survival probability of the population is low, the elimination rate of natural pottery is high, and the cumulative population is relatively lower than that of the river area in several years. Rivers are densely populated, and the power of rivers to promote air circulation cannot be underestimated.