Constellation knowledge why tides hinder the earth's rotation?

Tide is a natural phenomenon, but it is produced by the tidal force of the moon and the sun. So why do tides hinder the earth's rotation? Then let's use constellation knowledge to reveal the reasons! Let's see why!

Why do tides hinder the earth's rotation? Because the tides on the earth are mainly caused by the moon, followed by the sun. Tides are only changes in the sea surface, and there is almost no friction with the seabed. However, in the shallow sea area near the continental margin, the tide can violently rub against the bottom of the shallow sea, producing a certain friction force, which can stop the rotation of the earth and slow it down over time.

Define and classify the periodic movements and changes of the earth's lithosphere, hydrosphere and atmosphere due to the tidal force of the sun and the moon, which are collectively called tides. As a complete tidal science, its research object should be solid tide, ocean tide and atmospheric tide as a unified whole. However, because the tide phenomenon is very obvious and closely related to people's life, economic activities, transportation and so on, it is customary to interpret the word tide as ocean tide in a narrow sense. The elastic-plastic deformation of the solid earth caused by the tidal force of the sun and the moon is called solid tide, or solid tide for short. The periodic rise and fall, fluctuation and advance and retreat of the sea surface caused by the tidal force of the sun and the moon are called ocean tides, which are referred to as ocean tides for short. Periodic changes of atmospheric elements (such as pressure field, atmospheric wind field, earth's magnetic field, etc.) (such as 8 12, 24 hours). ) caused by the tide is called the atmospheric tides, referred to as the tide. Among them, the atmospheric tides caused by the sun is called the solar tide, and the lunar tide is called the moon tide. Salt tide is mainly caused by drought, which usually occurs from last winter to the next spring and Qingming period. Due to the lack of water and rain in the upper reaches of the river, the water level of the river drops, which leads to the return of seawater from coastal areas to inland areas through rivers or other channels. The influence of salt tide is mainly manifested in the content of chloride. According to the relevant national standards, if the chlorine content of water exceeds 250 mg/L, it is not suitable for drinking. This water quality will also endanger the survival of local plants. Salt tide is a unique seasonal natural phenomenon in coastal areas, which often occurs in dry season and dry season. The upstream of salt water refers to the pumping port located in the lower reaches of the river. When it is upstream of salt water, it is not fresh water that can be drunk and irrigated, but seawater that terrestrial organisms cannot rely on. Most of the salt tides in China occur in the Pearl River Estuary.

According to the tidal cycle, it can be divided into the following three categories: semidiurnal tide type: a lunar day has two high tides and two low tides, and the tidal range of the former high tide and low tide is almost the same as that of the latter high tide and low tide, and the time of high tide and low tide is almost equal (6 hours 12.5 minutes). The Bohai Sea, the East China Sea and the Yellow Sea are semi-diurnal tides in most parts of China, such as Dagu Lake, Qingdao and Xiamen. Diurnal tide type: A lunar day has only one high tide and one low tide. Such as Shantou in the South China Sea and Qinhuangdao in the Bohai Sea. Beibu Gulf in the South China Sea is a typical diurnal tide area in the world. Mixed tidal pattern: there are two high tides and two low tides on some days of 1 month, but the tidal range between the two high tides and low tides is quite different, and the time of high tides and low tides is not equal; On other days, there are high tides and low tides. Most parts of the South China Sea belong to mixed tidal type. For example, in Yulin Port, there is a diurnal tide on 15 days, and the other days are irregular semidiurnal tides with large tidal range. No matter what kind of tide, there will be a big tide with the largest tidal range within two or three days after the first and fifteenth day of each month in the lunar calendar, when the tide rises highest and falls lowest. Two or three days after August 23rd of the lunar calendar, there is a small tide with the smallest tidal range. At this time, the tide does not rise too high, and it is not too low at the end.

Related article recommendation: What is a nine-star renju? What is the aurora? When did the aurora appear? How many people in the world are Ophiuchus? Is Ophiuchus Sagittarius? Why is Ophiuchus excluded from existence? Is the thirteen constellations true? Ophiuchus date?

Singularity constellation network, an encyclopedia of constellation knowledge that many girls will pay attention to. Eight-character marriage, eight-character career, marriage fortune, constellation of wealth, emotional combination, seeing the other half, eight-character calculation, name speed matching, life fortune, compound opportunity, you can also consult the singularity constellation online at the bottom.