一、利用潮汐地球表面70%被海洋覆盖,由于月球和太阳引力的作用,使海洋水面周期性升降.潮汐的平均周期一般为12小时25分.白昼的称为潮,夜晚的称为汐.因月球的引潮力约为太阳的2.17倍,故潮汐现象主要随月球的运行情况而变化.地球水体质量异常巨大,海水潮汐起伏猛烈,潮汐能极富利用价值,而且利用过程中无污染,可再生,已成为人类努力方向. First, 70% of the Earth’s surface is covered with ocean tides. Because of the moon and the sun’s gravitational force, the ocean’s water surface periodically rises and falls. The average period of the tide is generally 12 hours and 25 minutes. The daylight is called the tide, and the night is called the flood. Because the lunar tidal force is about 2.17 times that of the sun, the tidal phenomenon mainly changes with the moon’s operation. The earth’s water quality is extremely large, seawater tides are fierce, tidal energy is highly utilized, and there is no pollution during use. Regeneration has become the direction of human efforts.