Why is the embankment wide at the top and narrow at the bottom, and what is the principle of barrage

You're wrong. Very simple.

The pressure of the water increases with depth.

So the embankment is narrow at the top and wide at the bottom.

Liquid pressure: 1The reason why the pressure of the liquid arises is due to the force of gravity on the liquid. If the liquid is weightless, there will be no pressure at all.

2.Due to the fluidity of liquids, the pressure generated by them has the following characteristics.

1) In addition to the pressure on the bottom of the container, the liquid also exerts pressure on the side walls that "restrict" its flow. Solids, on the other hand, only exert pressure on their bearing surfaces, always in a direction perpendicular to the bearing surfaces.

2) There is pressure inside the liquid in all directions, and the pressure is equal in all directions at the same depth.

3) The formula for calculating the pressure of a liquid is p= gh. It can be seen that the pressure of the liquid only depends on the type of liquid (i.e. density) and depth h, and has no direct relationship with the mass and volume of the liquid.

4) The liquid in the closed container can transfer the pressure it is subjected to in all directions according to its original size.

3.The pressure on the bottom of the container is not necessarily equal to the gravity of the liquid. The pressure at the bottom of the container is f=ps=ghs, where "hs" is the volume of the liquid column with a bottom area of s and a height of h, and "ghs" is the gravitational force of this liquid column.

As a result, the pressure on the bottom of the container may be equal to, or greater or less than, the gravitational force of the liquid itself.

It is narrow at the top and wide at the bottom.

Because according to p = p solution * g * h

Hence the relationship with depth. The deeper it is, the greater the pressure.

The lower width is in order to bear more pressure.

There is no such thing, it is narrow at the top and wide at the bottom.

The pressure on the bottom is greater than on the top.

From the formula liquid pressure density depth g under the condition of constant density, the greater the depth, the greater the pressure, so the deeper the embankment in the water, the greater the pressure of the water, so the embankment is wide at the top and narrow at the bottom.

It is related to the liquid pressure, the liquid pressure is related to the depth and the density of the liquid, the greater the depth of the same liquid, the greater the pressure, so the embankment is wide at the bottom and narrow at the top.

Barrage dams are narrow at the top and wide at the bottom, and they need to withstand greater water pressure. Since the greater the depth of the water, the greater the pressure, so the barrage dam is built in the shape of a narrow top and a wide bottom, which can withstand greater water pressure.

Introduction to barrage dams

Structures that block the river and block the river. The main project is earthwork excavation.

Dredging, river paving, embankments, stone masonry.

Slope protection, top pressing, tributary dredging and other shouts.

Tonghua County has built firewood barrage for more than 130 years. Since 1860, when the Qing Dynasty began to plant rice on a trial basis, several firewood dams were built to divert water from artesians. This ancient type of barrage has survived to the present day.

With the expansion of paddy fields, the number of barrages has gradually increased, and by 1985, the number of barrages in the county had reached 144.

This kind of firewood and stone dam is of poor quality, not strong, and cannot withstand the impact of floods, and is basically broken and repaired every year. Since 1981, some villages with good economic conditions have started to build slurry stone barrages. By 1985, there were 3 slurry stone dams in the county, with an irrigation area of 4,000 acres.

It is located in the upper reaches of the Bearick River, Huaxian Village, Sipeng Township. The original dam is a firewood and stone structure, and in 1981 it was changed to a slurry stone dam, with a total length of 70 meters, a dam height of 2 meters, a main channel of 2,400 meters, and an irrigation paddy field of 1,401 acres. To build this barrage, a total of 30,000 yuan was invested, and 3,000 cubic meters of earthwork were completed, 1,200 cubic meters of stone, 700 cubic meters of slurry masonry, and 80 cubic meters of concrete. Annihilation.

The reasons why the dam is narrow at the top and wide at the bottom are as follows:

The reason is that the pressure of the liquid increases with depth when other conditions are constant, so the lower part of the dam is subjected to greater pressure than the upper part of the dam, so the lower part is wider than the upper part of the dam.

Mainly according to the principle of mechanics to enhance its own interception of water impact firmness and long-term, the upper width and lower narrow embankment can block different pressures, but also save materials, can also prevent sediment from slipping, but also can reduce its own pressure, so that the embankment construction is more firm.

The role of the dam:

A dam is a water-retaining structure that intercepts the flow of water from a river channel to raise the water level or regulate the flow of water. Reservoirs can be formed to raise water levels, regulate runoff, and concentrate water heads, which can be used for flood control, water supply, irrigation, hydroelectric power generation, and improved shipping. River improvement structures that adjust the river level and protect the bank bed are also called dams, such as Ding dam, shun dam and submersible dam.

The teasing of the dam detects the badness:

Causing the depletion of fish stocks. Dams can not only intercept the flow of rivers to reflect the effect of storing water for backup, but also block the way of various aquatic organisms in the river, making it impossible for fish to reproduce smoothly.

Destruction of water distribution. The completion of every dam means that in some places the flow of water is blocked. In the Berland region of the Indian state of West Odisha, there used to be dozens of ponds in almost every village.

But after the dam was built, 80% of the pond was gone, which directly reduced the local food production.

The principle of wide under the barrage and narrow at the top:Liquid pressureIt is related to depth, and the greater the depth, the greater the pressure.

The principle of the lower width and upper narrowness of the barrage is that the liquid pressure increases with the increase of depth, and the deeper the water, the greater the pressure, so the "lower width" can withstand the greater pressure of the water, and the pressure of the water on the dam body increases with the increase of the depth of the water. There is pressure in all directions inside the br> liquid, the pressure is small as p= gh, and the lower part of the dam is wide and narrow at the top so that the lower part can resist the greater pressure. A barrage is a building that blocks the river and blocks the river water, and the main project is earthwork excavation.

Dredging, river paving, etc. The principle of BR> barrage is that the liquid pressure increases with the increase of depth, and the deeper the water, the greater the pressure, so the "lower width" can withstand the greater pressure of the water, and the pressure of the water on the Songbu dam increases with the increase of the depth of the water. There is pressure in all directions inside the liquid, the pressure is small as p= gh, and the lower part of the dam body is narrow in order for the lower part to resist the greater pressure.

Barrage is a building that blocks the river and blocks the river water, and the main projects include earthwork excavation, dredging, river bottoming, etc.

Introduction: Whether it is a river embankment or a reservoir dam, it is generally built narrow at the top and wide at the bottom. Why?

1. The reason why the dam is narrow at the top and wide at the bottom.

In order to resist the pressure, according to the liquid internal pressure formula p gh, the closer the water in the embankment is to the bottom of the embankment, the greater the water depth h, and the greater the pressure generated by the water The lower width of the embankment can withstand greater water pressure to ensure the safety of the embankment The greater the pressure of the lower part of the anti-seepage embankment, the easier it is for water to penetrate into the dam body The lower part is wider, and the water in the embankment can be extended.

The pressure of the water in the dam always has the tendency to push the embankment horizontally outward and push the dam downstream, and the base of the dam needs to have a static friction to compete with it.

In order to maintain the balance of the embankment The lower part of the embankment can not only increase the gravity of the dam body, but also increase the vertical downward pressure of the water on the water surface (water retaining surface) on the dam body, therefore, the maximum static friction between the dam body and the dam foundation can be enhanced, and the purpose of preventing the embankment from sliding can be achieved.

2. The benefits of dams.

The demand for dams is a consequence of the thirst for energy. In the face of increasingly serious environmental pressure, how to seek clean, durable and efficient energy has become a difficult problem facing the world in the 21st century. Dams can provide electricity.

It can also provide convenience for irrigation drinking water, flood control and navigation.

3. Hazards caused by dams.

While dams have so many benefits, they also have their share of problems. Once a dam is built, it will destroy the distribution of water resources, for example, there were many ponds in the village in the past, but after the dam was built, the ponds basically disappeared, affecting the food production in the area. Dams can change rainfall patterns, bring prosperity to one region but impoverishment another, add green to one region but deprive another, destroy habitats, destroy human living conditions in flooded areas, and so on.

In order to avoid the harm of dams, it is possible to avoid the relocation of a large number of villagers when building dams, and build fish ladders to protect the return of fish.

Because the underwater pressure is very large, building a wider one can better stop the water, which can have a very good effect.

It is because of this that it is not easy to clog, and it can also make us use it for a longer time.