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海洋能源包括潮汐能、潮流能、波浪能、温差能和盐差能等等,它们都属于取之不尽用之不竭的可再生能源。其中潮汐能和潮流能是一对孪生兄弟。天体引力场的周期变化,致使海水随之运动:潮位周期涨落,潮水往复流动,于是在海洋中出现了潮汐现象。潮汐能指的是海水由潮位差而产生的位能(压力水头);潮流能指的是潮水在作水平运动时所含有的动能(速度水头)。在海湾的湾口和岛屿间的航门水道,由于两岸的集流作用,潮流能尤为丰富。
Marine energy includes tidal energy, tidal current energy, wave energy, temperature difference energy and salt difference energy, etc. They are all inexhaustible sources of renewable energy. Tidal energy and tidal current can be a pair of twin brothers. The periodic change of gravitation field of celestial body causes the seawater to move along with it: the tide level fluctuates periodically and the tide flows back and forth, so the tidal phenomenon appears in the ocean. Tidal energy refers to the potential energy (pressure head) produced by the tidal range of the seawater; tidal current can refer to the kinetic energy (velocity head) contained in the tidal water for horizontal movement. In the bay’s mouth and the island’s gateway to the channel, due to the role of the cross-strait flow, the trend can be particularly rich.