Why does the swimming pool have to have a deep water area?

According to general logic, the buoyancy of deep water and shallow water should be exactly the same, and the water depth of 1.5 meters can be fully utilized. Why does adding deep water area increase the risk of swimming pool?

Youlang Swimming Pool made a simple analysis of this: although the buoyancy has not changed, the resistance will decrease. Specifically, the water waves generated by drawing water will reach the bottom of the pool and then reflect back, causing resistance to people. The deeper the water, the smaller the resistance and the longer the time.

Generally speaking, the resistance in swimming mainly comes from three aspects:

[If! SupportLists] 1, [endif] shape resistance. That is, the resistance caused by people's appearance. Therefore, in swimming teaching, body posture is emphasized, and the coach will make students try to keep their bodies straight and reduce the cross-sectional area, thus reducing the appearance resistance.

2. Surface resistance. Most people may not know much about this, mainly because of the resistance caused by the friction between the surface of the object (swimmer) and water. Generally speaking, the smoother the resistance, the smaller the resistance.

3. Water wave resistance. As the name implies, it is the resistance of water waves to people. In short, it is the splash we usually see when we watch swimming. Big splash, big resistance. The faster the speed, the bigger the water wave and the greater the resistance. This is also the reason for setting up deep pools. The deeper the water is, the less disturbance is reflected and the smaller the water wave resistance is. In addition, the water depth is more convenient for athletes to avoid water wave resistance by diving (because the water wave resistance under water will be smaller than the water surface).

For swimming pools that are generally open to the outside world, swimming pools that are too deep will cause great security risks, especially for teenagers who are short of height, and they are very prone to drowning. Once you drown, your life will be in danger. If the rescue is not timely, the consequences will be very serious. Therefore, Youlang Swimming Pool warmly reminds you that the swimming pool that is open to the outside world should not set up deep water areas!