1, an overview of tidal phenomenon, which refers to the periodic fluctuation of seawater under the action of periodic external forces. This periodic external force is mainly celestial gravity, especially the gravity of the moon and the sun. The rotation of the earth will also have an impact on the tides. Tides show periodic fluctuations on the ocean surface, which is opposite to the rotation direction of the earth, and its period is twice a day.
2. The causes of tidal formation. The main reason for the formation of tides is the gravity of celestial bodies, especially the gravity of the moon and the sun. Because the distance to the moon is close to the earth, the moon is more attractive to the earth, which will attract the seawater on the surface of the earth and make the seawater form a convex shape on the surface of the earth. In addition to celestial gravity, the rotation of the earth will also have an impact on the tides.
3. The mechanism of tidal formation mainly involves the balance of gravity and inertia force on the earth's surface. When the seawater on the earth's surface is attracted by celestial bodies, it will stay away from celestial bodies, leading to sea level rise. Under the action of centrifugal force, seawater will be far away from the center of the earth, resulting in a drop in sea level.
Influence of Tide on Marine Ecosystem
1. Promote material circulation: Tides keep the seawater circulating, bringing nutrients on the surface of the ocean to the depths of the ocean, and at the same time bringing nutrients from the deep sea to the shallow sea. This material cycle promotes the material exchange and energy flow among marine organisms and maintains the balance of marine ecosystem.
2. Maintain biodiversity: The change of tides provides a rich living environment for marine life, including intertidal zone and shallow sea area. These different ecological environments provide habitats, breeding grounds and foraging grounds for various marine organisms, and maintain the balance of biodiversity.
3. Maintain the balance of the ecosystem: the change of tides can affect the circadian rhythm of marine life, such as shellfish and crabs, which will be affected by the tidal cycle and present a circadian rhythm synchronized with the tidal cycle. This circadian rhythm is beneficial for these organisms to better adapt to the marine environment and maintain the balance of the ecosystem.
4. Affect human life: Tides also have an important impact on human life. For example, in coastal areas, people use tides to fish, mine salt, engage in coastal leisure and tourism. In addition, tides also have an impact on the erosion and deposition of coastline, affecting human life and economic activities.